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1. "Newer" trace elements in nutrition

Author:
Neilsen, F.H.; Hopkins, L.L.
Source:
Official proceedings of the annual meeting 1973 v.21st pp. 35-52
ISSN:
0569-2628
Subject:
Estimated Average Requirement; animal nutrition; growth and development; Adequate Intakes; animal reproduction; tin; bone mineralization; livestock; dietary nutrient sources; nutrient requirements; vanadium; nickel; cholesteremic effect; nutrition research; fluorine
Handle:
10113/48225

2. Abscission Processes in Cotton: Induction by Plant Water Deficit

Author:
B. L. McMichael; W. R. Jordan; R. D. Powell
Source:
Agronomy journal 1973 v.65 no.2 pp. 202-204
ISSN:
0002-1962
Subject:
Gossypium hirsutum; bolls; cotton; greenhouses; growth habit; juveniles; leaf abscission; leaf water potential; leaves; sand; water stress
Abstract:
... Premature boll shedding is characteristic of the cotton (Gossypium hirsutum L.) growth habit, but the extent of this shedding is quite variable. This study was undertaken to evaluate the effects of water stress on boll and leaf abscission. The experiments were conducted in a greenhouse using plants grown in pots containing sand. Plant water deficits were induced by withholding water. Leaf water po ...
DOI:
10.2134/agronj1973.00021962006500020005x

3. Absorption of 2,4-dichlorophenoxyacetic acid and 3-(p-chlorophenyl)-1,1-dimethylurea (Monuron) by barley roots

Author:
Donaldson, T.W.; Bayer, D.E.; Leonard, O.A.
Source:
Plant physiology 1973 v.52 no.6 pp. 638-645
ISSN:
0032-0889
Subject:
Hordeum vulgare; barley; roots; 2,4-D; monuron; uptake mechanisms
DOI:
10.1104/pp.52.6.638
PubMed:
16658621

4. Absorption of Mercuric Cation by Tannins in Agricultural Residues

Author:
A. C. Waiss; M. E. Wiley; J. A. Kuhnle; A. L. Potter; R. M. McCready
Source:
Journal of environmental quality 1973 v.2 no.3 pp. 369-371
ISSN:
0047-2425
Subject:
absorbents; absorption; agricultural wastes; bark; cations; grape pomace; heavy metals; hulls; ion exchange; manufacturing; mercury; mining; pectins; pollutants; tannins; wastewater
Abstract:
... Two common environmental pollutants are agricultural residues (skins, pits, husks, tannin bark, grape pomace) and waste streams of water containing only traces of heavy metals (such as mercury at 10 or more ppb) from mining or manufacturing operations. Agricultural residues contain tannins, polyphenolic substances, pectin, and other polymers—all with chemically reactive groups that can chelate, re ...
DOI:
10.2134/jeq1973.00472425000200030015x

5. Accumulated Heat Units for Classifying Corn Hybrid Maturity

Author:
H. J. Mederski; M. E. Miller; C. R. Weaver
Source:
Agronomy journal 1973 v.65 no.5 pp. 743-747
ISSN:
0002-1962
Subject:
Zea mays; climatic factors; corn; heat; phenology; plant development; planting date; prediction; seeds; Ohio
Abstract:
... Previous studies comparing the accumulated heat unit (AHU) method with the calendar day method for classifying corn (Zea mays L.) hybrids with respect to maturity do not clearly show the superiority of the AHU method over the calendar day method. They appear to have two limitations: (1) the range of climatic conditions under which the studies were conducted was not broad enough to elicit wide vari ...
DOI:
10.2134/agronj1973.00021962006500050020x

6. Accumulation of Dry Matter and Nitrogen Content of Burley Tobacco Growing in Fertilizer-induced Acid Soil

Author:
J. L. Sims; W. O. Atkinson
Source:
Agronomy journal 1973 v.65 no.5 pp. 762-765
ISSN:
0002-1962
Subject:
Nicotiana; acid soils; burley tobacco; dry matter accumulation; fertilizer rates; flowering; growing season; leaves; manganese; nitrogen compounds; nitrogen fertilizers; total nitrogen; toxicity
Abstract:
... Nicotiana tabarum L. cv. ‘Burley 21’ was grown in the field to determine the influence of rate of N fertilization on accumulation of dry matter and certain nitrogenous constituents during the growing season. Nitrogenous compounds in tobacco are presently of interest from a human health standpoint and the chemical constituents of tobacco leaves are known to be associated with dry matter accumulatio ...
DOI:
10.2134/agronj1973.00021962006500050026x

7. Accumulation of toxic levels of phosphorus in the leaves of phosphorus-deficient barley

Author:
Green, D.G.; Ferguson, W.S.; Warder, F.G.
Source:
Canadian journal of plant science 1973 v.53 no.2 pp. 241-246
ISSN:
0008-4220
Subject:
plant damage
DOI:
10.4141/cjps73-045

8. Accumulative Effects of Manure and N on Continuous Corn and Clay Soil. II. Chemical Changes in Soil

Author:
J. L. McIntosh; K. E. Varney
Source:
Agronomy journal 1973 v.65 no.4 pp. 629-633
ISSN:
0002-1962
Subject:
Zea mays; ammonium acetate; application rate; calcium; clay soils; corn; crops; dairy manure; exchangeable sodium; iron; magnesium; manganese; manure spreading; nutrient content; nutrient uptake; organic matter; pH; phosphorus fertilizers; potassium; sodium; soil amendments
Abstract:
... Continuous corn (Zea mays L.) was grown on a Panton clay soil (Typic Ochraqualf). Four rates of manure (0, 22, 44, and 66 tons/ha) and five rates of N (0, 56, 112, 168, and 224 kg/ha) were combined in a factorial arrangement and applied each year to the same plots. Also, 120 kg/ha of P and 90 kg/ha of K were applied for 4 years to all plots. Maintenance of structure and fertility had been difficul ...
DOI:
10.2134/agronj1973.00021962006500040030x

9. Acetylene-Reduction Assay of Anaerobic Nitrogen Fixation by Sediments of Selected Wisconsin Lakes

Author:
A. N. Macgregor; D. R. Keeney
Source:
Journal of environmental quality 1973 v.2 no.4 pp. 438-440
ISSN:
0047-2425
Subject:
acetylene reduction; enzyme inhibitors; lakes; methane; nitrogen fixation; nitrogenase; sediments; trophic levels; Wisconsin
Abstract:
... Sediments from two hardwater and six softwater lakes of varying trophic levels from Wisconsin were incubated under conditions which permitted continued synthesis of methane. Rates of acetylene reduction indicated that, on the average, sediments from hardwater and softwater lakes may fix 37 and 7.7 ng of N, respectively, per gram (dry weight) per day. The rate of acetylene reduction diminished in t ...
DOI:
10.2134/jeq1973.00472425000200040005x

10. Activation Analysis of Aluminum from Water Extract of Soil

Author:
U. K. Misra; E. R. Graham; W. J. Upchurch; D. M. McKown
Source:
Soil Science Society of America journal 1973 v.37 no.2 pp. 193-196
ISSN:
0361-5995
Subject:
aluminum; anion exchange resins; chlorides; gamma radiation; half life; leaching; lysimeters; manganese; nitrates; silica; silicon; soil water
Abstract:
... Determination of low-level Al in soil water extracts or lysimeter leachings requires a method extremely sensitive in the ppb range. ₁₃²⁷Al(n,γ)₁₃²⁸Al is rapid and convenient because it has a high cross section and a short half life. ²⁸Al may also be produced by ₁₄²⁸Si(n,p)₁₃²⁸Al. Hence a correction must be made by determining Si colorimetrially and finding the counts due to Si from a standard grap ...
DOI:
10.2136/sssaj1973.03615995003700020013x

11. Activity of Barley Seedling Roots as Measured by Strontium Uptake

Author:
J. M. Soileau
Source:
Agronomy journal 1973 v.65 no.4 pp. 625-628
ISSN:
0002-1962
Subject:
Hordeum vulgare; barley; calcium; crops; exchangeable calcium; fertilizers; greenhouses; magnesium; nutrient uptake; rhizosphere; root growth; roots; seedlings; soil depth; soil-plant interactions; strontium; strontium carbonate
Abstract:
... Root activity at various depths in soils is important in relation to effective use of lime and fertilizers by crops. Barley (Hordeum vulgare L.) seedlings were grown in presplit cylinders in the greenhouse to measure root activity in three 10-cm soil depth zones and to estimate daily rates of nutrient uptake. Twenty-five seedlings were planted per 15 ✕ 30 cm cylinder containing 6.5 kg of soil. SrC ...
DOI:
10.2134/agronj1973.00021962006500040029x

12. The Activity of Individual Molecules of Hybrid β-Galactosidase Reconstituted from the Wild-Type and an Inactive-Mutant Enzyme

Author:
Melchers, Fritz; Messer, Walter
Source:
European journal of biochemistry 1973 v.34 no.2 pp. 228-231
ISSN:
0014-2956
Subject:
Escherichia; active sites; beta-galactosidase; enzyme activity; hybrids; mutants
Abstract:
... A technique capable of detecting individual molecules of β-galactosidase has been used to measure the enzyme activity of single hybrid β-galactosidase molecules reconstituted from mixtures of varying proportions of wild-type and lac⁻ aba mutant enzyme. Reconstituted molecules exhibit activities of 0, 1/4, 2/4, 3/4, 4/4 of the wild-type enzyme, depending on the ratio of wild-type to mutant subunits ...
DOI:
10.1111/j.1432-1033.1973.tb02750.x

13. Adaptive Variation in Size of Cricket Frogs

Author:
Eviatar Nevo
Source:
Ecology 1973 v.54 no.6 pp. 1271-1281
ISSN:
0012-9658
Subject:
Acris crepitans; Neobatrachia; biogeography; body size; body weight changes; climate; correlation; frogs; geographical variation; grasslands; humidity; jumping; longitude; predation; rain; regression analysis; sibling species; temperature; variance; woodlands; North America
Abstract:
... Geographic variation in body size (BL) and relative foot size (F/B) was studied across the ranges of two sibling species of cricket frogs, genus Acris (Hylidae)in North America. Acris crepitans has a large range in eastern and central states extending from mesic woodlands to xeric grasslands, whereas A. gryllus has a limited range in southeastern states in mesic woodlands. Measurements of BL and F ...
DOI:
10.2307/1934189

14. Adaxial and Abaxial Stomatal Resistance of Cotton in the Field

Author:
Peter J. H. Sharpe
Source:
Agronomy journal 1973 v.65 no.4 pp. 570-574
ISSN:
0002-1962
Subject:
Gossypium hirsutum; ambient temperature; cotton; drought; lysimeters; soil water; stomata; stomatal conductance; stomatal movement; water stress; Australia
Abstract:
... An experiment was conducted near. Sydney, Australia to determine the adaxial and abaxial stomatal responses of cotton (Gossypium hirsutum L.) to environmental factors under noncycling field conditions. Cotton plants were grown in small lysimeter pans and transpiration was measured by strain guage lysimeters. Leaf temperature, ambient temperature and other micrometeorological parameters were monito ...
DOI:
10.2134/agronj1973.00021962006500040014x

15. Aerodynamic and Energy Balance Comparisons Between Awned and Nonawned Barley

Author:
J. F. Benci; J. K. Aase; A. H. Ferguson
Source:
Agronomy journal 1973 v.65 no.3 pp. 373-377
ISSN:
0002-1962
Subject:
Hordeum vulgare; aerodynamics; awns; barley; canopy; energy balance; heat transfer; isogenic lines; latent heat; net radiation; roughness length; turbulent flow
Abstract:
... The objective of the study was to evaluate the influence of awning characteristics of barley (Hordeum vulgare L.) on the partitioning of the heat load and the turbulent characteristics of the lower atmospheric boundary associated with the plant canopy. Aerodynamic studies of full-awned, half-awned, and nonawned isogenic barley indicated that awns increased the roughness length for the barley canop ...
DOI:
10.2134/agronj1973.00021962006500030008x

16. Agricultural Chemicals in Surface Runoff, Ground Water, and Soil: I. Endrin

Author:
G. H. Willis; R. A. Hamilton
Source:
Journal of environmental quality 1973 v.2 no.4 pp. 463-466
ISSN:
0047-2425
Subject:
Saccharum officinarum; agrochemicals; application rate; endrin; groundwater; rain; runoff; soil; sugarcane
Abstract:
... Endrin (1,2,3,4,10,10-hexachloro-6,7-epoxy-1,4, 4a,5,6,7,8,8aoctahydro-1,4-endo, endo-5,8-dimethanonapthalene) was surface applied at a rate of 0.337 kg/ha to sugarcane (Saccharum officinarum L.) plots instrumented to sample surface runoff and ground water. Runoff, ground water, and soil sampleswere collected over a 2-year period and analyzed for endrin. Only small amounts of endrin were lost annu ...
DOI:
10.2134/jeq1973.00472425000200040012x

17. Agronomic Potential of Nectariless Cotton

Author:
William R. Meredith; C. D. Ranney; M. L. Laster; R. R. Bridge
Source:
Journal of environmental quality 1973 v.2 no.1 pp. 141-144
ISSN:
0047-2425
Subject:
Coccinellidae; Gossypium hirsutum; Lygus lineolaris; agronomic traits; cotton; fiber quality; genetic variation; leaves; nectaries; predatory insects; river deltas; yield components
Abstract:
... We compared three BC₆F₄ nectariless strains of cotton (Gossypium hirsutum L.) with their recurrent parent varieties for yield, yield components, and fiber properties at six environments in 1971. A slight decrease (4.3%) in yield for nectariless ‘Stoneville 7A’ and a slight increase (3.8%) in yield for nectariless ‘Deltapine Smooth Leaf’ was detected. Nectaried and nectariless ‘Dixie King’ did not ...
DOI:
10.2134/jeq1973.00472425000200010026x

18. Air Entrapment as a Possible Source of Error in the Use of a Cylindrical Heat Probe

Author:
N. K. Nagpal; L. Boersma
Source:
Soil Science Society of America journal 1973 v.37 no.6 pp. 828-832
ISSN:
0361-5995
Subject:
air; ambient temperature; glass; heat; particle size; porous media; sieving; soil water; soil water content; thermal conductivity; water content
Abstract:
... The cylindrical heat probe is frequently used to measure the thermal conductivity of soils. Its theory is based on the assumption of zero thermal contact resistance at the probe surface. Noncompliance with this assumption could result from air entrapment at the probe surface, at the time of inserting the probe into the porous material. Results of studies are reported which show that the use of the ...
DOI:
10.2136/sssaj1973.03615995003700060014x

19. Air Temperature, Heat Sums, and Pollen Shedding Phenology of Longleaf Pine

Author:
William D. Boyer
Source:
Ecology 1973 v.54 no.2 pp. 420-426
ISSN:
0012-9658
Subject:
Pinus palustris; air temperature; heat sums; phenology; pollen; trees; Alabama; North Carolina
Abstract:
... Between 1957 and 1966, pollen shedding by longleaf pine (Pinus palustris Mill.) in southwestern Alabama peaked at dates ranging from February 23 to April 3. January 1 and 50 degrees F was the combination of starting date and threshold air temperature that minimized annual variations in heat sums before the trees flowered. The heat sum required for peak pollen shedding declined as the season advanc ...
DOI:
10.2307/1934351

20. Allocation of Scarce Resources to Agricultural Research: Review of Methodology

Author:
C. Richard Shumway
Source:
American journal of agricultural economics 1973 v.55 no.4_Part_1 pp. 557-566
ISSN:
0002-9092
Subject:
agricultural economics; agricultural research; models; quantitative analysis; research management; resource allocation
Abstract:
... With an increasing stress on research budgets, the impetus for investigation of alternative models for managing research is growing. Much work has been invested already in technique development. To precede additional research, the current state‐of‐the‐art in resource allocation methodology pertinent to agricultural research management is presented. The focus is on quantitative approaches for impro ...
DOI:
10.2307/1238340

21. Alopecia in rats housed in groups

Author:
Joyce L. Beare-Rogers; J. E. McGowan
Source:
Laboratory animals 1973 v.7 no.3 pp. 237-238
ISSN:
1758-1117
Subject:
alopecia; cages; experimental diets; laboratory animals; males; rats
Abstract:
... Young male rats fed experimental diets containing 20% by weight of fat developed alopecia when housed in groups, but not in individual cages. ...
DOI:
10.1258/002367773780944058

22. Alternative Tax Treatment of Orchard Development Costs: Impacts on Producers, Middlemen, and Consumers

Author:
Hoy F. Carman; James G. Youde
Source:
American journal of agricultural economics 1973 v.55 no.2 pp. 184-191
ISSN:
0002-9092
Subject:
agricultural economics; crops; income tax; orchards; California
Abstract:
... Present federal income tax laws allow current deduction of development costs for most orchard crops. An economic surplus framework is used to analyze the impact of cost capitalization on producers, middlemen, and consumers. Estimated net social returns per dollar of tax subsidy range from $0.12 to $15.00 for five California orchard crops under present tax treatment. ...
DOI:
10.2307/1238435

23. Amino Acid Distribution in Forest Humus Layers in British Columbia

Author:
L. E. Lowe
Source:
Soil Science Society of America journal 1973 v.37 no.4 pp. 569-572
ISSN:
0361-5995
Subject:
Sphagnum; autoclaves; forests; glutamic acid; glycine (amino acid); hexosamines; humus; hydrolysates; hydrolysis; leucine; mineral soils; organic horizons; proline; British Columbia
Abstract:
... Amino acid distribution was studied in hydrolysates from L, F, and H horizons at seven sites under different vegetation. Hydrolysis in an autoclave for 6 hours was found comparable to a 24-hour hydrolysis under reflux, but was more rapid and convenient and gave better precision in estimates of individual amino acid levels. Amino acid distribution was generally similar to that reported for mineral ...
DOI:
10.2136/sssaj1973.03615995003700040029x

24. Ammmonium and Nitrate Uptake by Corn (Zea mays L.) as Influenced by Nitrogen Concentration and NH+4 /NO-3 Ratio

Author:
D. D. Warncke; S. A. Barber
Source:
Agronomy journal 1973 v.65 no.6 pp. 950-953
ISSN:
0002-1962
Subject:
Zea mays; ammonium nitrate
Abstract:
... Corn (Zea mays L.) absorbs both ammonium and nitrate forms of N. Both are usually present in the soil and some control of their proportions can be obtained by controlling nitrification. Little is known about the relative rates of absorption of these ions or their effect on plant growth rate when both are present. We investigated the effects of NH₄⁺ and NO₃⁻ on corn by growing 13-day-old corn seedl ...
DOI:
10.2134/agronj1973.00021962006500060031x

25. Ammonia Volatilization from Surface Applications of Ammonium Compounds on Calcareous Soils: I. General Theory

Author:
L. B. Fenn; D. E. Kissel
Source:
Soil Science Society of America journal 1973 v.37 no.6 pp. 855-859
ISSN:
0361-5995
Subject:
ammonia; ammonium carbonate; ammonium chloride; ammonium hydroxide; ammonium nitrate; ammonium nitrogen; ammonium salts; ammonium sulfate; application rate; barium; calcareous soils; calcium; calcium sulfate; carbon dioxide; fluorides; magnesium; soil pH; solubility; volatilization
Abstract:
... Volatilization of NH₃ from NH₄⁻-N salts applied to the surface of a calcareous soil was investigated. Ammonia losses from surface applied NH₄F, (NH₄)₂SO₄, and (NH₄)₂HPO₄ were 68, 54, and 51%, respectively, of the added NH₄⁻-N in 100 hours. Ammonium nitrate, NH₄Cl, and NH₄I lost 18, 18, and 16%, respectively, of the added NH₄-N in 100 hours. An increase in pH at the soil surface resulted in higher ...
DOI:
10.2136/sssaj1973.03615995003700060020x

26. Analysis of Irradiation Induced Virescent Mutants and the Identification of a New Virescent Mutant (v5v5,v6v6) in Gossypium hirsutum L.

Author:
R. J. Kohel
Source:
Crop science 1973 v.13 no.1 pp. 86-88
ISSN:
0011-183X
Subject:
Gossypium hirsutum; cotton; genes; irradiation; loci; mutants
Abstract:
... Seven irradiation induced virescent cotton (Gossypium hirsutum L.) mutants were analyzed. Four were duplicates of virescent-1 and two were duplicates of yellowgreen. One virescent was independent of all known virescents. The new virescent was conditioned by recessive duplicate factors, and it was assigned the gene symbols v₅v₅,v₆v₆. Linkage analysis showed that the v₅ locus resides in the A subgen ...
DOI:
10.2135/cropsci1973.0011183X001300010027x

27. An Analytical Consideration of Undersoil Heating

Author:
George J. Trezek; Dennis Obeng
Source:
Journal of environmental quality 1973 v.2 no.4 pp. 458-462
ISSN:
0047-2425
Subject:
electric power; heat transfer; heat transfer coefficient; pipes; power plants; soil temperature; temperature profiles
Abstract:
... The feasibility of using reject heat from electrical power plants for undersoil heating has been analytically considered. Since soil is a poor thermal conductor, a suitable arrangement of undersoil pipes is required in order to achieve a somewhat uniformly elevated soil temperature. Two-dimensional steady temperature profiles in soil resulting from a warm water pipe having a wall temperature of 37 ...
DOI:
10.2134/jeq1973.00472425000200040011x

28. Analytical Solution of the Convective-Dispersive Equation for Cation Adsorption in Soils

Author:
Robert W. Cleary; Donald Dean Adrian
Source:
Soil Science Society of America journal 1973 v.37 no.2 pp. 197-199
ISSN:
0361-5995
Subject:
adsorption; cations; equations; soil
Abstract:
... The analytical solution of a cation adsorption soil problem is derived in detail by an integral transform method. The solution applies to the case of unsteady-state, one-dimensional flow through soils where a linear equilibrium exists between the cation in the flowing solution and the cation adsorbed on the exchanger phase. The effects of axial dispersion are also included in the solution. ...
DOI:
10.2136/sssaj1973.03615995003700020014x

29. Another hystricomorph rodent: keeping casiragua (Proechimys guairae) in captivity

Author:
Barbara J. Weir
Source:
Laboratory animals 1973 v.7 no.2 pp. 125-134
ISSN:
1758-1117
Subject:
Proechimys; animal feeding; animal handling; cages; captive animals; laboratory animals; reproduction; rodents
Abstract:
... Caging, feeding and handling are described. The animals were obtained for study of their reproduction and details of this are given. ...
DOI:
10.1258/002367773781008687

30. Antagonism of some soil microflora species against pathogenic Fusarium graminearum Schwabe and Rhizoctonia solani Kuhn agents

Author:
N. FLOREA
Source:
Notulae botanicae Horti Agrobotanici Cluj-Napoca 1973 v.7 no.1 pp. 73-74
ISSN:
1842-4309
Subject:
Aspergillus; Fusarium graminearum; Penicillium; Thanatephorus cucumeris; Trichoderma viride; Trichothecium roseum; antagonism; antagonists; soil; soil microorganisms
Abstract:
... In vitro results of some soil micoflora species antagonisms against pathogenic Fussarium graminearum Schwabe and Rhizoctonia solani Kuhn agents are presented. Following tets performed Aspergillus spp., Trichoderma viride and Penicillium spp. Were found to be antagonist against Fusarium graminearum. Antagonist against Rhizoctonia solani
DOI:
10.15835/nbha71164

31. Antimicrobial action of peracetic acid. 1. fungicidal action

Author:
Tutumi, M.; Imamura, K.; Hatano, S.; Watanabe, T.
Source:
Shokuhin Eiseigaku Zasshi 1973 v.14 no.5 pp. 443-447
ISSN:
0015-6426
Subject:
Aspergillus; Penicillium; Rhizopus; Mucor
DOI:
10.3358/shokueishi.14.443

32. Apparatus to measure the rate of fall of wind-dispersed seeds

Author:
Sheldon, J.C.; Lawrence, J.T.
Source:
New phytologist 1973 v.72 no.3 pp. 677-680
ISSN:
0028-646X
Subject:
Plant Science and Plant Products; botany
DOI:
10.1111/j.1469-8137.1973.tb04416.x

33. Application of Genetic Male Sterility to Recurrent Selection Schemes in Soybeans

Author:
C. A. Brim; C. W. Stuber
Source:
Crop science 1973 v.13 no.5 pp. 528-530
ISSN:
0011-183X
Subject:
plant genetics; plant breeding
Abstract:
... Recurrent selection schemes for soybeans [Glycine max (L.) Merr.] that use a genetic male-sterile factor to obtain natural crosses are outlined. A basic scheme with three generations per cycle, intermating, advancing, and testing, and modifications of the scheme are discussed. Guidelines for population size and selection intensity are considered. Expected genetic progress is presented for each sel ...
DOI:
10.2135/cropsci1973.0011183X001300050010x

34. Application of diazinon to greenhouse tomatoes: vegetable leaf miner control and residues in foliage and fruits

Author:
Lindquist, R.K.; Krueger, H.R.; Mason, J.F.; Spadafora, R.R.
Source:
Journal of economic entomology 1973 v.66 no.4 pp. 1001-1002
ISSN:
0022-0493
Subject:
Solanum lycopersicum var. lycopersicum; tomatoes; defoliation; Liriomyza sativae; diazinon; insect control; pesticide residues; food contamination; Ohio
DOI:
10.1093/jee/66.4.1001

35. An Approach to Farm Management Education

Author:
Michael Boehlje; Vernon Eidman; Odell Walker
Source:
American journal of agricultural economics 1973 v.55 no.2 pp. 192-197
ISSN:
0002-9092
Subject:
education programs; farm management; farms; planning; students
Abstract:
... As farm management education programs evolve to serve business‐oriented farm firms, planning, implementation, and control functions become major areas of emphasis. Integration of three computerized management tools—a budget generator, a management game, and LP‐FARM—in a farm management course provided students with practical experience in each management function. ...
DOI:
10.2307/1238436

36. An Approach to Research on Vertical Coordination: The Beef System in Oklahoma

Author:
Wayne D. Purcell
Source:
American journal of agricultural economics 1973 v.55 no.1 pp. 65-68
ISSN:
0002-9092
Subject:
agricultural economics; beef; marketing; Oklahoma
Abstract:
... Analysis of selected subsystems of the Oklahoma beef marketing system reveals conflicts and inconsistencies in basic interstage relationships. Such conflicts and inconsistencies block realization of higher degrees of interstage or interlevel coordination. Improvement will require a research orientation which isolates such barriers and estimates their impact on system participants. ...
DOI:
10.2307/1238664

37. Artificial Weathering of Oxidized Biotite: I. Potassium Removal by Sodium Chloride and Sodium Tetraphenylboron Solutions

Author:
R. J. Gilkes; R. C. Young; J. P. Quirk
Source:
Soil Science Society of America journal 1973 v.37 no.1 pp. 25-28
ISSN:
0361-5995
Subject:
absorption; biotite; cations; iron; leaching; mica; oxidation; potassium; sodium; sodium chloride; weathering
Abstract:
... The rate of release of interlayer potassium from biotite to NaCl and NaCl/sodium tetraphenylboron solutions is determined by the oxidation state of octahedral iron. Octahedral cation vacancies are generated when octahedral iron is oxidized resulting in a change of orientation of hydroxyl from perpendicular to the mica layer to parallel. This in turn produces a more stable environment for interlaye ...
DOI:
10.2136/sssaj1973.03615995003700010013x

38. Artificial Weathering of Oxidized Biotite: II. Rates of Dissolution in 0.1, 0.01, 0.001M HCl

Author:
R. J. Gilkes; R. C. Young; J. P. Quirk
Source:
Soil Science Society of America journal 1973 v.37 no.1 pp. 29-33
ISSN:
0361-5995
Subject:
biotite; cations; hydrochloric acid; iron; magnesium; manganese; oxidation; soil; surface area; weathering; zinc
Abstract:
... Rates of dissolution of biotite in 0.1, 0.01, 0.001M HCl decrease as the proportion of ferric iron in octahedrally coordinated sites increases. This is interpreted as being partly due to a decrease in the rate of K exchange from oxidized biotite so that a smaller surface area is exposed to acid attack. The availability of structural cations (Mg, Mn, Zn, K, etc.) to plants growing on biotite rich s ...
DOI:
10.2136/sssaj1973.03615995003700010014x

39. Ascocarps of Aspergillus stromatoides, Aspergillus niveus, and Aspergillus flavipes

Author:
Wiley, B.J.; Fennell, D.I.
Source:
Mycologia 1973 v.65 no.4 pp. 752-760
ISSN:
0027-5514
Subject:
soil fungi; Aspergillus flavipes; fruiting bodies; strains; in vitro culture
Handle:
10113/32130

40. Aspects of the Biology of Trientalis Borealis Raf

Author:
Roger C. Anderson; Orie L. Loucks
Source:
Ecology 1973 v.54 no.4 pp. 798-808
ISSN:
0012-9658
Subject:
ambient temperature; asexual reproduction; cold treatment; dry matter accumulation; germination; photoperiod; rhizomes; seedlings; seeds; tubers; North America
Abstract:
... Three species and one subspecies of Trientalis are recognized in North America, but only Trientalis borealis Raf., the northern starflower, occurs in eastern North America. The life cycle consists of three distinct phases each year: shoot development, rhizome growth, and tuber formation. Asexual reproduction by tubers is more important than reproduction by seed. Of the annual dry matter produced, ...
DOI:
10.2307/1935674

41. Assessment and Analysis of the Bellows Ventilation of Clothing

Author:
Z. Vokac; V. Køpke; P. Keül
Source:
Textile research journal 1973 v.43 no.8 pp. 474-482
ISSN:
0040-5175
Subject:
air; clothing; evaporation; fabrics; heat flow; microclimate; relative humidity; sorption; sweat; temperature; textile fibers; walking; water vapor
Abstract:
... A methodical approach is described, attempting to separate the loss of heat and moisture due to forced exchange of air inside clothing, when walking, from the loss caused by gradients between the body and the environment. Temperature, heat flow, and relative humidity were recorded on the skin of the back and inside the respective clothing (shirt only, vest and shirt, or vest, shirt and anorak) in ...
DOI:
10.1177/004051757304300806

42. Das Auftreten physiologischer Rassen von Phytophthora infestans (Mont.) de By. im Jahre 1970 auf dem Gebiet der DDR

Author:
Hahn, E.; Henniger, H.; Oertel, H.
Source:
Archiv für Pflanzenschutz 1973 v.9 no.2 pp. 105-112
ISSN:
0003-9349
Subject:
potatoes; German Federal Republic
DOI:
10.1080/03235407309431213

43. Automated Total Nitrogen Analysis of Soil and Plant Samples

Author:
G. E. Schuman; M. A. Stanley; D. Knudsen
Source:
Soil Science Society of America journal 1973 v.37 no.3 pp. 480-481
ISSN:
0361-5995
Subject:
automation; environmental quality; rapid methods; soil; total nitrogen
Abstract:
... Soils research dealing with environmental quality requires the analysis of large numbers of samples to better characterize the problem. An automated technique, using a Tecator digester and Technicon AutoAnalyzer, has proved to be as reliable as the standard micro-Kjeldahl procedure and permits more rapid analysis of the digests (30 per hour). The system is compact and involves fewer steps for anal ...
DOI:
10.2136/sssaj1973.03615995003700030045x

44. Bagworms: effectiveness of several insecticide formulations against the larvae of three species

Author:
Nakayama, I.; Kuroda, T.; Kitagaki, T.; Shinohara, H.; Otokozawa, T.
Source:
Journal of economic entomology 1973 v.66 no.4 pp. 941-943
ISSN:
0022-0493
Subject:
Chamaecyparis pisifera; Lepidoptera; Viburnum odoratissimum; insecticides; pest control; Prunus mume
DOI:
10.1093/jee/66.4.941

45. Barley leaf tip damage resulting from exposure to high electrical fields

Author:
Bachman, C.H.; Reichmanis, M.
Source:
International journal of biometeorology 1973 v.17 no.3 pp. 243-251
ISSN:
0020-7128
Subject:
plant damage
DOI:
10.1007/BF01804617

46. Below-Break Tensile Behavior of Irradiated Nylon:Part I : Ultraviolet-Irradiated Nylon 1

Author:
Margaret I. Morton
Source:
Textile research journal 1973 v.43 no.7 pp. 385-393
ISSN:
0040-5175
Subject:
air; exposure duration; fabrics; irradiation; nylon; tensile strength; textile fibers
Abstract:
... The below-break tensile properties (tensile modulus, stress decay, and elastic recovery behavior) of carbon-are-irradiated nylon 66 and nylon 6 fibers were examined after extensions of 2 and 5% held for 0-15 min under both air-dry and wet conditions. In general, the moduli of fibers extended in air were increased in proportion to the exposure time. A non- ultraviolet-stabilized nylon 66 specimen, ...
DOI:
10.1177/004051757304300704

47. Below-Break Tensile Behavior of Irradiated Nylon:Part II : Gamma-Irradiated Nylon

Author:
Margaret I. Morton
Source:
Textile research journal 1973 v.43 no.8 pp. 433-437
ISSN:
0040-5175
Subject:
air; crosslinking; fabrics; gamma radiation; irradiation; nylon; tensile strength; textile fibers
Abstract:
... The air-dry and wet below-break tensile properties (tensile modulus, stress decay, and residual extension) of nylon 66 and nylon 6 were assessed at extensions of 2 and 5% after gamma radiation dosages ranging from 0 to 15 Mrad. Modulus increases were found for fibers extended in air subsequent to the irradiation; whereas in water, little change was evident. Slight improvements in stress decay and ...
DOI:
10.1177/004051757304300801

48. Besnoitia bennetti in Two Mexican Burros

Author:
T. G. Terrell; J. L. Stookey
Source:
Veterinary pathology v.10 no.2 pp. 177-184
ISSN:
1544-2217
Subject:
Besnoitia; animal pathology; asses; females; foals; herds; males; perineum; testes; Maryland
Abstract:
... Besnoitia bennetti infection was detected in two Mexican burros from a closed herd of 15 animals in Maryland. Cystic stages, which were about 1.0 mm in diameter, were found in the testicle of a male and in the skin of the perineum and teat of a female. The superficial location of the cysts on the teat suggests the potential for traumatic rupture and oral transmission during nursing by a foal. The ...
DOI:
10.1177/030098587301000210

49. Binding of papain to dialdehyde starch

Author:
Weakley, F.B.; Mehtretter, C.L.
Source:
Biotechnology and bioengineering 1973 v.15 no.6 pp. 1189-1192
ISSN:
0006-3592
Subject:
starch; starch products; chemical reactions; aldehydes; protein binding; binding capacity; papain; enzyme activity
Handle:
10113/30921
DOI:
10.1002/bit.260150615

50. Biogeography of the Puerto Rican Bank: Species‐Turnover on a Small Cay, Cayo Ahogado

Author:
Harold Heatwole; Richard Levins
Source:
Ecology 1973 v.54 no.5 pp. 1042-1055
ISSN:
0012-9658
Subject:
Crustacea; biogeography; energy; extinction; fauna; flight; flora; habitats; humans; hurricanes; immigration; invertebrates; lizards; reproductive success; sand; wind; Puerto Rico
Abstract:
... The equilibrium species—number of plants on Cayo Ahogado, a small sand cay east of Puerto Rico, is 11.2 if all species are considered, and 6.8 if only established species are counted. Establishment is defined in terms of reproductive success and presence on the island for at least two consecutive visits. There were only five species in the permanent flora. Species—turnover rates of plants were hig ...
DOI:
10.2307/1935570

51. Biological functions of multistable proteins

Author:
Nickerson, K.W.
Source:
Journal of theoretical biology 1973 v.40 no.3 pp. 507-515
ISSN:
0022-5193
Subject:
proteins; energy; protein subunits; enzymes; protein tertiary structure; thermodynamics; protein quaternary structure; cell membranes; active transport; temperature; molecular biology
Handle:
10113/31054
PubMed:
4754894

52. Biomass and Nutrient Content of Hazel Undergrowth

Author:
John C. Tappeiner II; Hugo H. John
Source:
Ecology 1973 v.54 no.6 pp. 1342-1348
ISSN:
0012-9658
Subject:
manganese; nutrient content; underground parts; stems; equations; calcium; nutrients; aerial parts; biomass; stand basal area; vegetation; leaves; overstory; Minnesota
Abstract:
... Studies in hazel undergrowths in five Minnesota pine stands provided techniques for estimating total hazel biomass and its three components (leaves, aerial stems, underground parts). Regression equations were developed for estimating total biomass and the three components based on measurements of aerial stem weight, aerial stem basal area, or number of aerial stems. Nutrient concentrations in the ...
DOI:
10.2307/1934197

53. Blendability of Phenotypically Similar and Dissimilar Winter Barley Cultivars

Author:
Monope Palvakul; Verne C. Finkner; D. L. Davis
Source:
Agronomy journal 1973 v.65 no.1 pp. 74-77
ISSN:
0002-1962
Subject:
Hordeum vulgare; cultivars; flowering date; grain yield; phenotype; phenotypic selection; plant height; winter barley
Abstract:
... The objectives of the reported research were to compare the performance of winter barley (Hordeum vulgare L. emend. Lam.) and to determine if overcompensation would be associated with blends of similar or dissimilar phenotypes. The performance of 28 bi-line blends, each in a 1:1 genotypic ratio, was compared with the performance of the eight component lines grown in monoculture. The eight componen ...
DOI:
10.2134/agronj1973.00021962006500010023x

54. Botanical Composition of Subclover-Grass Pastures as Affected by Single and Dual Grazing by Cattle and Sheep

Author:
T. E. Bedell
Source:
Agronomy journal 1973 v.65 no.3 pp. 502-504
ISSN:
0002-1962
Subject:
Festuca arundinacea; Lolium perenne; Trifolium subterraneum; animal performance; arid lands; botanical composition; cattle; forage; forage production; grasses; grazing; pastures; sheep; Oregon
Abstract:
... Since cattle and sheep tend to prefer different forage species and since little information has been available upon which to design successful grazing programs for western Oregon dryland improved pastures, a grazing experiment was conducted to determine the effects of several combinations of cattle and sheep use on forage species composition and livestock performance. Improved pasture mixtures of ...
DOI:
10.2134/agronj1973.00021962006500030044x

55. Breeding Behavior for Crosses of Crambe abyssinica and a Plant Introduction Designated C. hispanica

Author:
V. D. Meier; K. J. Lessman
Source:
Crop science 1973 v.13 no.1 pp. 49-51
ISSN:
0011-183X
Subject:
plant genetics; plant breeding
Abstract:
... Plant selections from PI 247310 (C. abyssinica) and PI 279346 (C. hispanica) were paired randomly and crossed reciprocally. The average seed set from these crosses was about 77% with no reciprocal differences detected. Chromosome counts were made on pollen mother cells from each species and the F₁ progeny. The average count was 41 bivalents at diakinesis for each species and the F₁ plants; the num ...
DOI:
10.2135/cropsci1973.0011183X001300010015x

56. Breeding Behavior of Maize-Tripsacum Hybrids

Author:
J. M. J. de Wet; J. R. Harlan; L. M. Engle; C. A. Grant
Source:
Crop science 1973 v.13 no.2 pp. 254-256
ISSN:
0011-183X
Subject:
plant genetics; plant breeding
Abstract:
... Hybrids bewteen Zea mays L. and octaploid Tripsacum dactyloides (L.) L. are male sterile but female fertile. They reproduce by means of aposporous gametophytic apomixis, or sexually. The 36 Tripsacum chromosomes of these hybrids pair preferentially, while the 10 Zea chromosomes remain as univalents during meiotic prophase and are often excluded from the daughter nuclei. Failure of cytokinesis duri ...
DOI:
10.2135/cropsci1973.0011183X001300020031x

57. Breeding Methods for Improving Yield and Fiber Quality of Upland Cotton (Gossypium hirsutum L.)

Author:
T. W. Culp; D. C. Harrell
Source:
Crop science 1973 v.13 no.6 pp. 686-689
ISSN:
0011-183X
Subject:
plant genetics; plant breeding
Abstract:
... In the introgression of Gossypium arboreum L. ✕ G. thurberi Tod. fiber strength to medium staple Upland cotton (G. hirsutum L.), we have been most successful with the pedigree method of hybridization and selection. Hybridization is required for the recombination of genes for high lint yield and fiber strength or length, and selection is necessary to locate the desirable recombinants in segregating ...
DOI:
10.2135/cropsci1973.0011183X001300060030x

58. Breeding Sex Ratios, Territoriality, and Reproductive Success in the Red‐Winged Blackbird (Agelaius Phoeniceus)

Author:
Celia Haigh Holm
Source:
Ecology 1973 v.54 no.2 pp. 356-365
ISSN:
0012-9658
Subject:
Agelaius phoeniceus; adults; breeding; females; fledglings; food availability; males; nesting sites; nests; polygyny; predation; predators; rain; reproductive success; sex ratio; starvation; territoriality; vegetation; wind
Abstract:
... Data on sex rations, territoriality, and reproductive success were obtained from a breeding population of Red—winged Blackbirds, and were used to examine the adaptive significance of polygyny and nest—site selection. All the territorial males on the study area were adults, and the sex ratio of the population was 3.0 females per male in 1966 and 2.7 females per male in 1967, with the range being 0— ...
DOI:
10.2307/1934343

59. Broadcast or Banded Atrazine + Propachlor with Tillage Variables in Grain Sorghum

Author:
R. S. Moomaw; L. R. Robison
Source:
Agronomy journal 1973 v.65 no.2 pp. 274-276
ISSN:
0002-1962
Subject:
Sorghum bicolor; atrazine; grain sorghum; grain yield; herbicide mixtures; hoeing; propachlor; soil; surface area; weed control; weeds
Abstract:
... Application of a herbicide to the least possible soil surface area consistent with adequate weed control in a given crop production system may be desirable because costs are reduced and less chemical is added to the environment. Data have not been available to indicate the minimum herbicide band width that could be used in combination with mechanical tillage in grain sorghum [Sorghum bicolor (L.) ...
DOI:
10.2134/agronj1973.00021962006500020026x

60. Bulk, Pedigree, and Early Generation Testing Breeding Methods Compared in Soybeans

Author:
V. D. Luedders; L. A. Duclos; A. L. Matson
Source:
Crop science 1973 v.13 no.3 pp. 363-364
ISSN:
0011-183X
Subject:
plant genetics; plant breeding
Abstract:
... Soybean (Glycine max (L.) Merr.) lines selected from populations advanced by the pedigree, early generation (F₄ and F₅) testing, and 2 bulk methods were evaluated in the F₆ and F₇. Differences in the yield of these lines due to method of generation advance were not significant. However, with selection on 2-year means and in each individual year, the complete bulk (CB) and early generation testing ...
DOI:
10.2135/cropsci1973.0011183X001300030022x

61. Calcium-Magnesium-Potassium Equilibria in Some California Soils

Author:
R. M. Carlson; J. R. Buchanan
Source:
Soil Science Society of America journal 1973 v.37 no.6 pp. 851-855
ISSN:
0361-5995
Subject:
ammonium acetate; calcium chloride; cations; chromatography; equations; ion exchange; magnesium chloride; models; potassium; potassium chloride; potassium fertilizers; soil profiles; soil sampling; California
Abstract:
... Ion exchange equilibria in several soils were studied to seek equilibrium equations that could be used in chromatographic models dealing with movement and distribution of fertilizer potassium in soil profiles. Soil samples were equilibrated with mixtures of CaCl₂, MgCl₂, and KCl solutions and then extracted with NH₄OAc to determine exchangeable cation compositions at equilibrium. It was necessary ...
DOI:
10.2136/sssaj1973.03615995003700060019x

62. Calco Oil Red N-1700 for marking adults and eggs of the southwestern corn borer

Author:
Davis, F.M.
Source:
Annals of the Entomological Society of America 1973 v.66 no.5 pp. 1167-1168
ISSN:
0013-8746
Subject:
Diatraea grandiosella; dyes; feed additives; artificial diets
DOI:
10.1093/aesa/66.5.1167

63. Callosobruchus maculatus: observations of attack on cowpeas in Iran

Author:
Schalk, J.M.; Rassoulian, G.
Source:
Journal of economic entomology 1973 v.66 no.2 pp. 579-580
ISSN:
0022-0493
Subject:
Vigna unguiculata; cowpeas; developmental stages; Callosobruchus maculatus; longevity; oviposition; plant pests; storage pests; Iran
DOI:
10.1093/jee/66.2.579

64. Canine Malignant Mammary Tumors. III. Special Types of Carcinomas, Malignant Mixed Tumors

Author:
W. Misdorp; E. Cotchin; J. F. Hampe; Anne G. Jabara; J. von Sandersleben
Source:
Veterinary pathology v.10 no.3 pp. 241-256
ISSN:
1544-2217
Subject:
animal pathology; carcinoma; dogs; lungs; mammary neoplasms (animal); permeability; sarcoma
Abstract:
... Sixty-four metastasized canine malignant mammary tumors were studied. The most important types of canine mammary cancer are discussed. Mammary squamous cell carcinomas of different types are found more frequently in the dog than in man. Mucinous carcinoma, a very rare type in the dog, seems to be more malignant than its counterpart in man. Anaplastic carcinoma in the dog is a very malignant diffus ...
DOI:
10.1177/030098587301000307

65. Canine Nephrotoxic Glomerulonephritis: A Combined Light, Immunofluorescent, and Ultrastructural Study

Author:
N. G. Wright; H. Thompson; H. J. C. Cornwell
Source:
Veterinary pathology v.10 no.1 pp. 69-86
ISSN:
1544-2217
Subject:
animal pathology; basement membrane; blood serum; complement; dogs; electron microscopy; fluorescent antibody technique; glomerulonephritis; immunoglobulin G; intravenous injection; laboratory animals; light microscopy; necrosis; nephrotoxicity; neutrophils; rabbits
Abstract:
... The sequential pathology of canine nephrotoxic glomerulonephritis was studied by light microscopy, immunofluorescence and electron microscopy. The disease was induced by intravenous administration of antiglomerular basement membrane serum, and experimental animals were examined from 4 h up to 60 days after administration of nephrotoxic serum. During the first few days there was extensive glomerula ...
DOI:
10.1177/030098587301000107

66. Canopy Temperatures of Barley as Influenced by Morphological Characteristics

Author:
Hayden Ferguson; R. F. Eslick; J. K. Aase
Source:
Agronomy journal 1973 v.65 no.3 pp. 425-428
ISSN:
0002-1962
Subject:
Hordeum vulgare; barley; canopy; color; environmental factors; heading; plant morphology; temperature; thermometers; water use efficiency
Abstract:
... Canopy temperature under a set of environmental conditions is an integrated result of the energy absorption and dissipation mechanisms acting within the canopy. The relative magnitude of these various mechanisms may affect the amount and efficiency of water use. We studied the influence of different morphological features such as plant color, awn length, and waxiness on canopy temperatures of fiel ...
DOI:
10.2134/agronj1973.00021962006500030021x

67. Carbohydrases in the alimentary canal of the large milkweed bug, oncopeltus fasciatus (hemiptera: lygaeidae)

Author:
SRIVASTAVA, SHANTA T.; AUCLAIR, J.L.
Source:
Entomologia experimentalis et applicata 1973 v. no. pp. 301-304
ISSN:
0013-8703
Subject:
Oncopeltus fasciatus; adults; alpha-galactosidase; alpha-glucosidase; beta-galactosidase; digestive tract; lactose; maltose; melezitose; raffinose; sucrose
Abstract:
... Adults of the large milkweed bug, Oncopeltus fasciatus (Dallas), deprived of food for 48 hr, were fed 5% solutions of either sucrose, maltose, lactose, raffinose or melezitose, for 15-20 min. The alimentary canals were then dissected out 30 min or 1 hour after the period of feeding, and the gut contents chromatographed. The results indicated the presence in the gut of the following carbohydrases: ...
DOI:
10.1111/j.1570-7458.1973.tb00278.x

68. Carbohydrates in Grasses: V. Incorporation of 14C into Plant Parts and Nonstructural Carbohydrates of Timothy (Phleum pratense L.) at Three Developmental Stages

Author:
J. A. Balasko; Dale Smith
Source:
Crop science 1973 v.13 no.1 pp. 19-22
ISSN:
0011-183X
Subject:
Phleum pratense; carbohydrates; carbon dioxide; flowering; forage grasses; inflorescences; leaf blade; meristems; photosynthates; radioactivity; roots; stem elongation; stems
Abstract:
... Distribution of photosynthates in forage grasses is important in terms of yield, quality, and persistence. The objectives of this study were to learn more about the distribution of ¹⁴C fed to timothy (Phleum pratense L.) at different growth stages and to follow its incorporation into nonstructural carbohydrates of stem bases. Plants at three developmental stages — initiation of stem elongation, ea ...
DOI:
10.2135/cropsci1973.0011183X001300010007x

69. Carbon Dioxide Evolution from the Floor of an Oak-Hickory Forest

Author:
H. E. Garrett; G. S. Cox
Source:
Soil Science Society of America journal 1973 v.37 no.4 pp. 641-644
ISSN:
0361-5995
Subject:
Carya; Quercus; autumn; carbon dioxide; carbon dioxide production; forest litter; forests; microorganisms; soil temperature; soil water; spring; summer; winter
Abstract:
... Carbon dioxide evolution from the floor of an oak-hickory (Quercus sp.) (Carya sp.) forest was studied. The influence of soil temperature, soil moisture, and position on a west-facing slope was evaluated on a seasonal basis. Highest evolution rates were observed during the summer and declined in the order of fall, spring, and winter. Maximum summer rates were 1.20 g/m² per hour while maximum winte ...
DOI:
10.2136/sssaj1973.03615995003700040045x

70. Carbon Dioxide and the Photosynthesis of Field Crops. A Tracer Examination of Turbulent Transfer Theory

Author:
L. A. Harper; J. E. Box; D. N. Baker; J. D. Hesketh
Source:
Agronomy journal 1973 v.65 no.4 pp. 574-578
ISSN:
0002-1962
Subject:
Gossypium hirsutum; aerodynamics; carbon dioxide; cotton; energy balance; field crops; photosynthesis; wind
Abstract:
... Carbon dioxide was released at ground level in a cotton (Gossypium hirsutum L.) field, and the flux above the crop was measured. The aerodynamic and energy balance methods of calculating carbon dioxide flux underestimated the measured flux by approximately the same amounts. There was considerable variability in the difference between measured and calculated fluxes, and little correlation with mete ...
DOI:
10.2134/agronj1973.00021962006500040015x

71. Carpel morphology and axis-sharing in syncarpy in some Rutaceae, with further comments on “New Morphology”

Author:
GUÉDÈS, MICHEL
Source:
Botanical journal of the Linnean Society 1973 v.66 no.1 pp. 55-74
ISSN:
0024-4074
Subject:
Choisya; Citrus; Poncirus; carpels; flowers
Abstract:
... Carpels in Choisya, Rufa, Poncirus and Citrus are peltate. In Citrus the style contains as many isolated canals as there are carpels, and these canals are shown to be bounded by the morphologically outer (lower) surface of the carpel. All instances exhibit an at least incipient syncarpy, and the floral axis is always involved in the central merging of the carpels. This is especially obvious here o ...
DOI:
10.1111/j.1095-8339.1973.tb02160.x

72. Causes and development of hollow heart in pea seed

Author:
Perry, D.A.; Harrison, J.G.
Source:
Annals of applied biology 1973 v.73 no.1 pp. 95-101
ISSN:
0003-4746
Subject:
plant damage
DOI:
10.1111/j.1744-7348.1973.tb01313.x

73. Cell Wall Properties of Cotton Roots as Influenced by Calcium and Salinity

Author:
C. J. Gerard; E. Hinojosa
Source:
Agronomy journal 1973 v.65 no.4 pp. 556-560
ISSN:
0002-1962
Subject:
Gossypium hirsutum; calcium; calcium deficiency; cell walls; cotton; ions; phloem; plant growth; polarized light; roots; salinity; stele; toxicity; xylem
Abstract:
... Research was ,conducted to determine the influences of salinity and Ca uptake on cell wall properties of cotton (Gossypium hirsutum L.) roots. It was postulated that examination of cell wall properties might give insight on the role of Ca in moderating the influences of salinity and toxic ions on cellular stability and plant growth. Age and Ca are essential to the development of thick cell walls i ...
DOI:
10.2134/agronj1973.00021962006500040010x

74. Change in bacterial flora and chemical quality during chill storage after thawing of frozen pork

Author:
Kokubo, Y.
Source:
Shokuhin Eiseigaku Zasshi 1973 v.14 no.5 pp. 448-451
ISSN:
0015-6426
Subject:
Pseudomonas
DOI:
10.3358/shokueishi.14.448

75. Changes in Arctic Eriophorum Tussock Communities Following Fire

Author:
Ross W. Wein; L. C. Bliss
Source:
Ecology 1973 v.54 no.4 pp. 845-852
ISSN:
0012-9658
Subject:
Calamagrostis canadensis; Carex; Epilobium angustifolium; Eriophorum vaginatum; annuals; autumn; ecological succession; ecosystems; fires; growing season; microbial activity; mosses and liverworts; new species; nutrient content; peat; regrowth; rootstocks; seedlings; shoots; soil; tundra; water power; Arctic region
Abstract:
... The arctic cottongrass (Eriophorum vaginatum ssp. spissum) tussock community is susceptible to fire even though it has a relatively small aboveground standing crop and the peaty substrate is wet even in years of low precipitation. While burns can be severe enough to kill all aboveground plant parts, differential protection is provided new shoots by tussocks bases, moss mats, and peat. Plant succes ...
DOI:
10.2307/1935679

76. Changes in Efficiencies and Numbers of Chloroplasts Associated with Divergent Selection for Juvenile Productivity in Zea Mays (L.)

Author:
W. D. Hanson
Source:
Crop science 1973 v.13 no.3 pp. 386-387
ISSN:
0011-183X
Subject:
DNA; Zea mays; chlorophyll; chloroplasts; corn; heritability; juveniles; leaf area; leaf width; photosynthesis
Abstract:
... Selections of maize (Zea mays L.) which differed in vegetative productivity also differed in photosynthetic efficiencies. The nature of the associated response was evaluated. Selections for high productivity had similar chloroplast diameters but larger guard and epidermal cells than selections for low productivity. The high selections had 90% the DNA per cm2 leaf area but 110% the DNA per leaves 4 ...
DOI:
10.2135/cropsci1973.0011183X001300030029x

77. Changes in Number and Size Distribution of U. S. Soybean Processing Firms

Author:
Paul L. Farris
Source:
American journal of agricultural economics 1973 v.55 no.3 pp. 495-499
ISSN:
0002-9092
Subject:
agricultural economics; industry; public policy; soybeans; viability
Abstract:
... Rapid growth in soybean processing was accompanied by declining processor numbers between 1946 and 1971. Large firm concentration rose through 1965, then stabilized. Processor size distributions after 1953 tended toward lognormality. Future industry structure may be significantly influenced by public policies affecting competitive viability of intermediate size firms. ...
DOI:
10.2307/1239132

78. Changes in Patterns of Seasonal Growth of Microtus Pennsylvanicus

Author:
Ernest B. Brown III
Source:
Ecology 1973 v.54 no.5 pp. 1103-1110
ISSN:
0012-9658
Subject:
Blarina brevicauda; Clethrionomys; Microtus pennsylvanicus; Peromyscus; adults; field experimentation; mammals; seasonal growth; seasonal variation; snowpack; spring; summer; trapping; weight loss; winter
Abstract:
... A field study of growth, in terms of both linear dimensions and weight, was made by successively trapping the small winter—active mammals found in a study area in a region with persistent winter snow cover. The animals trapped were primarily Microtus pennsylvanicus, with some data also on Blarina brevicauda, Clethrionomys gapperi, and Peromyscus sp. The reliability of the field measurements was de ...
DOI:
10.2307/1935576

79. Chemical and Physical Processes that Affect Atrazine and Distribution in Soil Systems

Author:
Roger A. Swanson; Gordon R. Dutt
Source:
Soil Science Society of America journal 1973 v.37 no.6 pp. 872-876
ISSN:
0361-5995
Subject:
adsorption; atrazine; calcium; chlorides; computer simulation; desorption; effluents; equations; exchangeable cations; hysteresis; ionic strength; magnesium; prediction; sodium; soil; solubility; sorption isotherms
Abstract:
... Interactions studied included adsorption and desorption of atrazine by Ca²⁺, Mg²⁺, and Na⁺ saturated soil material and the effect of chloride salts of the above cations on solubility of crystalline atrazine. It was found that adsorption isotherms follow the Freundlich equation. The desorption isotherm had the same shape as the adsorption isotherm but followed a different path back to the starting ...
DOI:
10.2136/sssaj1973.03615995003700060024x

80. Chemical and Physical Properties of Cotton Modified by N-Methylol Agents:III : Observations on Polymerization and Crosslinking of Melamine-Based Reagents with Cotton

Author:
Sidney L. Vail; Gerald B. Verburg
Source:
Textile research journal 1973 v.43 no.2 pp. 67-74
ISSN:
0040-5175
Subject:
alkylation; amides; chemical structure; cotton; fabrics; hydrolysis; physical properties; polymerization; steaming; textile fibers; textile industry
Abstract:
... The chemical structure of the finish obtained from melamine-hased reagents depends primarily on the constitution of the reactant and the reaction conditions. Attempts are made to follow the reaction of these various reagents from the pad bath formulation to the finished fabric under reaction conditions of interest to the textile industry. Specific reactions discussed include hydrolysis, alkylation ...
DOI:
10.1177/004051757304300202

81. Chemical and Spectroscopic Methods for Assessing Subsidence in Florida Histosols

Author:
B. G. Volk; M. Schnitzer
Source:
Soil Science Society of America journal 1973 v.37 no.6 pp. 886-888
ISSN:
0361-5995
Subject:
Histosols; carbon dioxide; chemical reactions; free radicals; humic acids; moieties; quinones; spectroscopy; subsidence; Florida
Abstract:
... The extent of subsidence of cultivated histosols in the Everglades of southern Florida can be assessed by chemical and spectroscopic methods. Higher subsidence rates tend to be associated with the following changes in the chemistry of humic acids, the principal constituent of histosols: (i) increases in CO₂H, phenolic OH, quinone, and ketonic C=O groups; (ii) decreases in aliphatic structures as s ...
DOI:
10.2136/sssaj1973.03615995003700060027x

82. The Chemistry and Physiology of Pigmentation in Leaves Injured by Air Pollution

Author:
R. K. Howell; D. F. Kremer
Source:
Journal of environmental quality 1973 v.2 no.4 pp. 434-438
ISSN:
0047-2425
Subject:
Phaseolus vulgaris; air pollutants; air pollution; amino acids; discoloration; enzymes; forage crops; leaves; metals; moieties; molecular weight; nutritive value; oxidants; oxidation; ozone; phenol; pigmentation; plant physiology; plant pigments; polymerization; polymers; proteins; quinones; sieves; sugars
Abstract:
... Oxidant air pollutants induce necrotic lesions and discoloration on foliage of susceptible plants. The time of initiation of oxidized plant pigments in response to ozone and the chemical composition of the pigments were investigated. Plants of Phaseolus vulgaris humilis L., with nearly fully expanded leaves, were treated with ozone. Leaves removed immediately, 2, 4, and 24 hours after treatment we ...
DOI:
10.2134/jeq1973.00472425000200040004x

83. The Chemistry of Fungal Humic Acid-like Polymers and of Soil Humic Acids

Author:
M. Schnitzer; M. I. Ortiz de Serra; K. Ivarson
Source:
Soil Science Society of America journal 1973 v.37 no.2 pp. 229-236
ISSN:
0361-5995
Subject:
dicarboxylic acids; fatty acids; fungi; gas chromatography; humic acids; mass spectrometry; methylation; oxidation; peat; phenolic acids; phenols; polymers; soil; solvents
Abstract:
... A. niger, E. nigrum, and S. chartarum were grown in glucoseasparagine media according to Martin et al. The fungal “humic acids” synthesized were isolated, purified, and characterized by elementary and functional group analyses and by permanganate oxidation of methylated preparations. The oxidation products were separated by extraction into organic solvents, followed by preparative gas chromatograp ...
DOI:
10.2136/sssaj1973.03615995003700020022x

84. Chickpea resistance to Callosobruchus maculatus in Iran

Author:
Schalk, J.M.
Source:
Journal of economic entomology 1973 v.66 no.2 pp. 578-579
ISSN:
0022-0493
Subject:
Cicer arietinum; varieties; pest resistance; Callosobruchus maculatus; oviposition; chickpeas; stored product protection; Iran
DOI:
10.1093/jee/66.2.578

85. Chilling injury in green banana fruit: changes in peroxidase isozymes in soluble and particulate pools

Author:
Haard, N.F.; Timbie, D.
Source:
Journal of food science 1973 v.38 no.4 pp. 642-645
ISSN:
0022-1147
Subject:
plant damage
DOI:
10.1111/j.1365-2621.1973.tb02833.x

86. Chlorinated Hydrocarbon Insecticide Residues in Crops and Soil

Author:
Ralph G. Nash; William G. Harris
Source:
Journal of environmental quality 1973 v.2 no.2 pp. 269-273
ISSN:
0047-2425
Subject:
Avena sativa; Glycine max; Triticum aestivum; Zea mays; alcohols; aldehydes; aldrin; application rate; chlordane; corn; crops; dieldrin; endrin; heptachlor; heptachlor epoxide; insecticide residues; lindane; oats; oxidation; sandy loam soils; seeds; soybeans; toxaphene; wheat; Maryland
Abstract:
... A series of small Congaree sandy loam field plots at Beltsville, Maryland, were treated with 0, 56 or 112, and 224 kg/ha of aldrin, dieldrin, isodrin, endrin, heptachlor, chlordane, BHC, toxaphene, or Dilan in 1951. Sixteen years later the parent compounds were still detectable with mean total residues of 29 (pure aldrin), 35 (technical aldrin), 23, 16, 39, 10, 9, 7, 49, and 15%, respectively, rem ...
DOI:
10.2134/jeq1973.00472425000200020022x

87. Chlorodioxins in Pesticides, Soils, and Plants

Author:
C. S. Helling; A. R. Isensee; E. A. Woolson; P. D. J. Ensor; G. E. Jones; J. R. Plimmer; P. C. Kearney
Source:
Journal of environmental quality 1973 v.2 no.2 pp. 171-178
ISSN:
0047-2425
Subject:
2,4,5-T; Haliaeetus leucocephalus; leaves; sand; soil; tetrachlorodibenzo-p-dioxin; toxicity; toxicology; volatilization
Abstract:
... Chlorodioxins, such as 2, 3, 7, 8-tetrachlorodibenzo-p-dioxin (TCDD), are highly toxic impurities found in certain pesticides. A review is made of (i) the sources and toxicology of TCDD and its relationship to the herbicide 2,4,5-trichlorophenoxyacetic acid (2,4,5-T), and (ii) pesticide analyses and soil-related environmental studies of TCDD conducted by the U. S. Department of Agriculture. TCDD w ...
DOI:
10.2134/jeq1973.00472425000200020003x

88. Chronic ozone or sulfur dioxide exposures, or both, affect the early vegetative growth of soybean

Author:
Tingey, D.T.; Reinert, R.A.; Wickliff, C.; Heck, W.W.
Source:
Canadian journal of plant science 1973 v.53 no.4 pp. 875-879
ISSN:
0008-4220
Subject:
plant damage
DOI:
10.4141/cjps73-169

89. Coadministration of Gibberellin and Auxin-Type Herbicides on Sugarcane

Author:
R. A. Yates
Source:
Agronomy journal 1973 v.65 no.5 pp. 844-845
ISSN:
0002-1962
Subject:
4-CPA; MCPA (herbicide); Saccharum; gibberellic acid; growth inhibitors; growth retardation; interspecific hybridization; leaves; reducing sugars; ripening; screening; sucrose; sugarcane
Abstract:
... Combinations of gibberellic acid (GA) and 2-methyl, 4-chlorophenoxyacetic acid (MCPA) were applied to the foliage of greenhouse-grown sugarcane (interspecific hybrids of Saccharum), as part of a program of screening potential ripening agents. GA induced the typical growth stimulation, lasting: about 4 weeks in these trials. MCPA induced a transient growth stimulation (lasting only one week) follow ...
DOI:
10.2134/agronj1973.00021962006500050053x

90. Coexistence in Laboratory Populations of Paramecium Aurelia and Its Predator Didinium Nasutum

Author:
Leo S. Luckinbill
Source:
Ecology 1973 v.54 no.6 pp. 1320-1327
ISSN:
0012-9658
Subject:
Paramecium; bacteria; extinction; methylcellulose; predator-prey relationships
Abstract:
... Previous attempts at the prolonged laboratory study of predator—prey systems lacking refuges or physical complexity have been unsuccessful. The addition of Methyl Cellulose to interacting laboratory populations of Paramecium aurelia and its predator, Didinium nasutum, prolongs coexistence by reducing the frequency of contact between predator and prey. The study of this system under controlled cond ...
DOI:
10.2307/1934194

91. Combining Ability and Gene Action Estimates in an Eight Parent Diallel Cross of Sugarbeet

Author:
G. A. Smith; R. J. Hecker; G. W. Maag; D. M. Rasmuson
Source:
Crop science 1973 v.13 no.3 pp. 312-316
ISSN:
0011-183X
Subject:
plant genetics; plant breeding
Abstract:
... Twenty-eight F₁ hybrids from an eight parent diallel cross grown at two nitrogen fertility levels were analyzed for type of gene action controlling 11 sugarbeet (Beta vulgaris L.) characters. Nonadditive genetic variance was of prime importance in controlling root weight under low and high nitrogen levels, accounting for 51% and 68% of the total genetic variance, respectively. For recoverable suga ...
DOI:
10.2135/cropsci1973.0011183X001300030007x

92. Combining Income and Wealth: An Analysis of Farm Family “Well‐Being”

Author:
Thomas A. Carlin; Edward I. Reinsel
Source:
American journal of agricultural economics 1973 v.55 no.1 pp. 38-44
ISSN:
0002-9092
Subject:
agricultural economics; farm families; income
Abstract:
... Personal distribution of well‐being of farm families relative to all U. S. families is substantially improved when wealth is considered along with money income. The “live poor and die rich” paradox facing older farm families could often be overcome by providing an easier means whereby they could use up equity in family living. ...
DOI:
10.2307/1238659

93. Comparative Feeding Ecology of a Tropical Grassland Finch (Tiaris Olivacea)

Author:
H. Ronald Pulliam
Source:
Ecology 1973 v.54 no.2 pp. 284-299
ISSN:
0012-9658
Subject:
grasslands; habitats; hills; ingestion; sexual dimorphism; variance; Costa Rica; Jamaica
Abstract:
... The feeding ecology of the yellow—faced grassquit (Tiaris olivacea) was studied on a large island (Jamaica) and on the mainland (Costa Rica). Despite an apparent reduction in competition on Jamaica, yellow—faced grassquits are less abundant in Jamaica than in Costa Rica and are found in approximately the same number of habitats on the island and on the mainland. There seem to be no changes in the ...
DOI:
10.2307/1934337

94. The Comparative Pathogenesis of Some Enteric Diseases. Based on Cases Presented at the 22nd Annual Seminar of the American College of Veterinary Pathologists

Author:
T. H. Kent; H. W. Moon
Source:
Veterinary pathology v.10 no.5 pp. 414-469
ISSN:
1544-2217
Subject:
animal pathology; digestive system diseases; intestines; morphogenesis; pathogenesis; signs and symptoms (animals and humans)
Abstract:
... Basic reactions of the intestinal tract to injury are discussed using cases presented at the American College of Veterinary Pathologists' Seminar on Intestinal Pathology. Reports of the individual cases are cited in the text. Material reported during discussions is presented to preserve something of the tenor of the Seminar. First, the morphogenesis of the lesions in each case will be discussed, f ...
DOI:
10.1177/030098587301000506

95. Comparative Photosynthesis of Quebec and California Ecotypes of Typha Latifolia

Author:
S. J. McNaughton
Source:
Ecology 1973 v.54 no.6 pp. 1260-1270
ISSN:
0012-9658
Subject:
Typha latifolia; acclimation; climate; ecotypes; growing season; leaves; oxygen; photosynthesis; temperature; transpiration; California; Quebec
Abstract:
... Photosynthesis and transpiration were examined in detached leaves of broad—leaved cattail (Typha latifolia L.) ecotypes from a long growing season continental climate in California's central valley and a short growing season continental in northwestern Quebec when grown under identical conditions. The principal difference between the ecotypes were (a) greater temperature dependence of net photosyn ...
DOI:
10.2307/1934188

96. Comparative Phytotoxity of Nitrapyrin and its Principal Matabolite, 6-Chloropicolinic Acid

Author:
J. Geronimo; L. L. Smith; G. D. Stockdale; C. A. I. Goring
Source:
Agronomy journal 1973 v.65 no.5 pp. 689-692
ISSN:
0002-1962
Subject:
plant damage
Abstract:
... Previous laboratory studies have shown that nitrapyrin (2-chloro-6-(trichloromethyl) pyridine) can produce totoxicity in certain plants. Nitrapyrin hydrolyzes in soil to 6-chloropicolinic acid; however, the phytotoxic properties of the latter compound have not been compared with those of the former. Therefore, studies were conducted to compare the relative toxicity of nitrapyrin and 6-chloropicoli ...
DOI:
10.2134/agronj1973.00021962006500050003x

97. Comparative effects of ethylene oxide, gamma irradiation and microwave treatments on selected spices

Author:
Vajdi, M.; Pereira, R.R.
Source:
Journal of food science 1973 v.38 no.5 pp. 893-895
ISSN:
0022-1147
Subject:
ethylene; microwave cooking; gamma radiation; microbial contamination; food irradiation; spices; food safety
DOI:
10.1111/j.1365-2621.1973.tb02102.x

98. Comparative morphology of the carpel in the Liliaceae: Wurmbaeae

Author:
STERLING, CLARENCE
Source:
Botanical journal of the Linnean Society 1973 v.66 no.1 pp. 75-82
ISSN:
0024-4074
Subject:
Liliaceae; carpels; integument; ovules; pistil; sutures
Abstract:
... The two genera of Buxbaum's tribe Wurmbaeae, Anguillaria and Wurmbea, have multiovulate carpels. There are deep septal indentations between the carpels of Anguillaria, but the wings of adjoining carpels are fused to solid septa in most species of Wurmbea. In Anguillaria the carpels have open sutures or prominent commissural markings; in Wurmbea the carpels generally lack these characteristics, and ...
DOI:
10.1111/j.1095-8339.1973.tb02161.x

99. Comparative morphology of the gametophytes of the genus Equisetum, subgenus Equisetum

Author:
DUCKETT, JEFFREY G.
Source:
Botanical journal of the Linnean Society 1973 v.66 no.1 pp. 1-22
ISSN:
0024-4074
Subject:
Equisetum; branches; gametophytes; metamorphosis; spermatocytes; sporophytes; taxonomy
Abstract:
... When grown under a variety of axenic conditions gametophytes of E. arvense, E. telmateia, E. sylvaticum, E. palustre, and E. fluviatile are all morphologically distinct. Lamellae from archegonial branches provide several diagnostic features but lamellae associated with antheridia are much less distinct. The archegonia of all five species have two neck canal cells and three tiers of neck cells and ...
DOI:
10.1111/j.1095-8339.1973.tb02157.x

100. A Comparison Between Mercury Injection and Nitrogen Sorption as Methods of Determining Pore Size Distributions

Author:
I. D. Sills; L. A. G. Aylmore; J. P. Quirk
Source:
Soil Science Society of America journal 1973 v.37 no.4 pp. 535-537
ISSN:
0361-5995
Subject:
contact angle; goethite; mercury; models; nitrogen; porosity; soil; sorption
Abstract:
... A comparison of mercury injection and nitrogen sorption methods of pore size distribution analysis was made on a sample of goethite using the slit-shaped pore model. Using the commonly accepted contact angle of 140° for mercury, the mercury pore-size distribution plot is displaced by approximately 20% in plate separation with respect to the nitrogen plot. The assumption of a contact angle of 153° ...
DOI:
10.2136/sssaj1973.03615995003700040021x