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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