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1. Ammonia and gaseous nitrogen emissions from a commercial beef cattle feedyard estimated using the flux-gradient method and N:P ratio analysis

Author:
Todd, R.W.; Cole, N.A.; Harper, L.A.; Flesch, T.K.; Baek, B.H.
Source:
Proceedings, Symposium, State of the Science, Animal Manure and Waste Management : January 4-7, 2005, San Antonio, Texas / sponsored by: National Center for Manure and Animal Waste Management and Cooperative State Research Extension and Education Service (CSREES) Multi-State Committee, S-1000, Animal Manure and Waste Utilization, Treatment and Nuisance Avoidance for a Sustainable Agriculture pp. -
Subject:
estimation; ammonia; diet; chemiluminescence; feeds; winter; nitrogen; feedlots; body weight; air temperature; beef cattle; cattle manure; wind speed; summer; gas emissions; phosphorus; air pollution; Texas; High Plains (United States)
Abstract:
... Micrometeorological methods used to estimate emissions are advantageous because they are noninterfering and can integrate fluxes over large areas. They have not been routinely applied to beef cattle feedyards, where physical complexity and the possibility of disturbed air flow may be problematic. Our objective was to use the flux-gradient method to estimate NH3 emissions from beef cattle feedyard ...
Handle:
10113/16188

2. Assessment of cropping system effects on soil quality in the Great Plains: introduction

Author:
Varvel, G.; Riedell, W.; Deibert, E.; McConkey, B.; Tanaka, D.; Vigil, M.; Schwartz, R.
Source:
Dynamic cropping systems principles, processes, and challenges : proceedings / Northern Great Plains Research Laboratory ; [J.D. Hanson and J.M. Krupinsky, editors] pp. -
Subject:
soil quality; air temperature; cropping systems; weather; crop yield; Great Plains region
Abstract:
... Soils serve a multitude of functions and play an important role in environmental quality through interactions with the hydrosphere and the atmosphere. Long-term studies are usually required to compare management effects on the soil resource to make soil quality assessments. This requirement exists because of the effect annual variations in weather have on the system and also because we are often t ...
Handle:
10113/20650

3. Effects of instrument shelters on air temperature and humidity measurements

Author:
Dusek, D.A.; Howell, T.A.
Source:
Evapotranspiration and irrigation scheduling : proceedings of the international conference, November 3-6, 1996, San Antonio Convention Center, San Antonio, Texas / editors, C.R. Camp, E.J. Sadler, and R.E. Yoder ; co-sponsors, the Irrigation Association, International Committee on Irrigation Drainage pp. -
Subject:
relative humidity; air temperature; automation; agroclimatology; weather stations; measurement; heat sums
Handle:
10113/1652

4. Estimations of ammonia and hydrogen sulfide fluxes from cattle feedlot surfaces in Texas High Plains

Author:
Baek, B.H.; Koziel, J.A.; Spinhirne, J.D.; Parker, D.B.; Cole, N.A.
Source:
Air pollution from agricultural operations III : proceedings of the third International Symposium, 12-15 October 2003, Raleigh, North Carolina pp. -
Subject:
water content; air pollution; air quality; ammonium nitrogen; hydrogen sulfide; gas emissions; cattle; feedlots; air temperature; cattle manure; pH; analytical methods; measuring devices; equipment design; Texas
Handle:
10113/16613

5. Flux-Gradient Estimates of Ammonia Emissions from Beef Cattle Feedyard Pens

Author:
Todd, R.W.; Cole, N.A.; Harper, L.A.; Flesch, T.K.
Source:
International Symposium on Air Quality and Waste Management for Agriculture : proceedings of the 16-19 September 2007 conference, Broomfield, Colorado pp. -
Subject:
estimation; ammonia; animal feeding operations; chemiluminescence; winter; nitrogen; air temperature; beef cattle; spring; wind speed; summer; gas emissions; ammonium nitrogen; Texas
Abstract:
... Concentrated animal feeding operations are major sources of ammonia emitted to the atmosphere. There is a considerable literature on ammonia emissions from poultry and swine, but few studies have investigated large, open lot beef cattle feedyards. We used the micrometeorological flux-gradient method to estimate ammonia emissions during six field campaigns in three seasons. Profiles of ammonia, win ...
Handle:
10113/46016

6. Heat Stress Effects on Growing-Finishing Swine

Author:
Nienaber, J.A.; Brown-Brandl, T.M.
Source:
Twenty Fifth annual Carolina Swine Nutrition Conference : November 10, 2009, Sheraton Imperial Hotel, Research Triangle Park, North Carolina / sponsored by Carolina Feed Industry, in cooperation with North Carolina State University, North Carolina Department of Agriculture & Consumer Services pp. -
Subject:
heat stress; animal growth; swine; animal stress; animal behavior; swine housing; air temperature; feed intake
Handle:
10113/46453

7. Olive fruit fly biology and cultural control practices in California

Author:
Yokoyama, Victoria Y.; Miller, Gina T.
Source:
Proceedings of the meeting at Florence (Italy), 26-28 October 2005 = Comptes rendus de la réunion à Florence (Italy), 26-28 October 2005 / edited by Argyro Kalaitzaki pp. -
Subject:
insect pests; pupae; oviposition; insect attractants; relative humidity; irrigation; Olea europaea; air temperature; irrigated farming; olives; Bactrocera oleae; larvae; insect development; imagos; mortality; California
Handle:
10113/20063

8. Swine wastewater treatment by constructed wetlands in the southeastern United States

Author:
Hunt, P.G.; Szogi, A.A.; Humenik, F.J.; Rice, J.M.; Stone, K.C.
Source:
Constructed wetlands for animal waste management : proceedings of workshop, 4-6 April 1994, Lafayette, Indiana / edited by Paul J. DuBowy and Richard P. Reaves pp. -
Subject:
pig manure; wastewater; wastewater treatment; constructed wetlands; Typha; Juncus effusus; Scirpus; Sparganium; Glycine max; soybeans; Oryza sativa; rice; nitrification; denitrification; nitrogen; phosphorus; redox potential; seasonal variation; air temperature; ammonium nitrogen; North Carolina
Handle:
10113/18397

9. Thermal analysis and behavioral activity of heifers in shade or sunlight

Author:
Hillman, P.E.; Gebremedhin, K.G.; Brown-Brandl, T.M.; Lee, C.N.
Source:
Livestock Environment VII : proceedings of the Seventh International Symposium, Beijing, China, 18-20 May 2005 / [sponsored by ASAE ; hosted by China Agricultural University] pp. -
Subject:
breed differences; heifers; animal behavior; solar radiation; fur; thermoregulation; absorption; air temperature; beef cattle; body temperature; heat stress; mechanistic models; shade; color; mass transfer; heat transfer; thermal analysis
Handle:
10113/8512

10. The handling and storage of spring wheat

Author:
Bailey, C.H.
Source:
Agronomy journal 1917 v.9 no.6 pp. 275-281
ISSN:
0002-1962
Subject:
water content; spring wheat; heat treatment; air temperature; storage quality; grain storage facilities
DOI:
10.2134/agronj1917.00021962000900060003x

11. Activity of nitrification processes in the fall and winter months

Author:
Bartholomew, R.P.
Source:
Agronomy journal 1932 v.24 no.6 pp. 435-442
ISSN:
0002-1962
Subject:
nitrogen content; winter; autumn; tillage; nitrification; air temperature; Secale cereale; cover crops; nitrogen compounds; Vicia; soil fertility; silt loam soils; sandy loam soils; nitrates; Arkansas
Abstract:
... Results of experiments to determine whether nitrification takes place in soils which are subjected to cold periods with intermittent warm periods are reported. Studies to determine the value and efficiency of cover crops are also reported. The results may be summarized as follows: (1) Nitrates were produced in soil during the fall and winter months; (2) relatively large amounts of nitrates disappe ...
DOI:
10.2134/agronj1932.00021962002400060002x

12. Comparison of chamber and field germination tests of soybeans

Author:
Cutler, G.H.
Source:
Agronomy journal 1932 v.24 no.7 pp. 544-550
ISSN:
0002-1962
Subject:
Glycine max; seed germination; strain differences; air temperature; rain; Indiana
Abstract:
... In a 4-year test ungraded seed of the Manchu variety of soybeans gave 5.04 +/- 0.57% better germination in the chamber than in the field, with 320 chamber tests and 480 field tests. During the same years ungraded seed of the Dunfield variety gave similar results on a limited number of tests. Three strains of the Manchu variety, viz., Nos. 29, 32, and 40, in a 4-year test, gave a significantly bett ...
DOI:
10.2134/agronj1932.00021962002400070007x

13. Differences of injury by frost to wheat plants grown comparably

Author:
Waldron, L.R.
Source:
Agronomy journal 1932 v.24 no.6 pp. 494-500
ISSN:
0002-1962
Subject:
height; plant characteristics; Triticum aestivum; frost resistance; frost injury; crop yield; air temperature; seedling growth; stems; weight; varieties; hybrids
Abstract:
... As a result of severe April and May frosts a certain proportion of plants in rows of Hard Federation and F5 hybrid selections were injured. Uninjured and injured plants of the two groups were labeled and sorted at harvest. A study made upon these showed that the injury persisted during the life of the plant with a marked decrease in yield. The injured plants were nearly 10% less in height than the ...
DOI:
10.2134/agronj1932.00021962002400060009x

14. Effect of nitrate of potash on the vigor and productivity of healthy and leaf-roll Green Mountain potato plants and their progenies

Author:
Butler, O.; Murray, H.L.
Source:
Agronomy journal 1932 v.24 no.11 pp. 881-887
ISSN:
0002-1962
Subject:
Solanum tuberosum; potassium nitrate; vigor; crop yield; length; tubers; fruit set; air temperature; residual effects
Abstract:
... In the course of an investigation on the effect of temperature on the growth and productivity of successive generations of healthy and leaf-roll Green Mountain potatoes, it was noticed that nitrate of potash applied to some of the cultures not only increased yields but also resulted in loss of vigor in the progeny of the fertilized plants. These results were deemed of sufficient interest to warran ...
DOI:
10.2134/agronj1932.00021962002400110005x

15. Organic matter as a factor in classification of the soils of dry regions

Author:
Shaw, C.F.
Source:
Agronomy journal 1932 v.24 no.7 pp. 565-577
ISSN:
0002-1962
Subject:
soil classification; arid zones; textural soil types; soil parent materials; nitrogen content; soil water content; air temperature; soil depth; rain; soil pH; altitude; humus; soil color; vegetation; California
Abstract:
... We must conclude from these studies that the organic matter content is not dominant in determining the color of the soils in regions of periodic precipitation with hot dry summers and cool moist winters, and that it occupies a very minor place in determining the characteristics of soil profiles. Of much more importance in profile development, and consequently to soil classification, are the minera ...
DOI:
10.2134/agronj1932.00021962002400070010x

16. Root development in hardy and non-hardy winter wheat varieties

Author:
Worzella, W.W.
Source:
Agronomy journal 1932 v.24 no.8 pp. 626-637
ISSN:
0002-1962
Subject:
Triticum aestivum; root systems; variety trials; air temperature; rain; adventitious roots; length; seasonal development; weight; shoots; Indiana
Abstract:
... 1. The root systems of four non-hardy and four hardy varieties of winter wheats were examined at various intervals during 1929-30 and 1930-31 when grown in the field. 2. Seasonal conditions greatly influenced the amount of root development in fall and early spring in winter wheat. In a warm and dry season the roots grew more rapidly and penetrated to lower depths than in a cooler and wetter season ...
DOI:
10.2134/agronj1932.00021962002400080005x

17. The resistance of certain varieties and regional strains of alfalfa to controlled low temperatures

Author:
Timmons, F.L.; Salmon, S.C.
Source:
Agronomy journal 1932 v.24 no.8 pp. 642-655
ISSN:
0002-1962
Subject:
air temperature; strain differences; Medicago sativa; frost injury; varietal resistance; cold tolerance; mortality
Abstract:
... 1. Several hundred plants of each of several varieties and strains of alfalfa were grown in the field, transplanted, and frozen under controlled conditions in the fall and early winter of 1929-30 and 1930-31. 2. Provence (F. C. I. 34886) and Hardistan proved to be more resistant than any other variety or strain tested. Grimm and Ladak, were second. A third group consisted of Dakota common, Nebrask ...
DOI:
10.2134/agronj1932.00021962002400080007x

18. Chlorophyll content as an index of the productive capacity of selfed lines of corn and their hybrids

Author:
Sprague, H.B.; Curtis, N.
Source:
Agronomy journal 1933 v.25 no.11 pp. 709-724
ISSN:
0002-1962
Subject:
plant nutrition; Zea mays; hybrids; chlorophyll; leaf area; methodology; carotenes; lutein; air temperature; rain; strain differences; color; yields; phenotypic correlation
Abstract:
... 1. In a study of methods, it was found that the area of corn leaf blades could be determined as accurately by the formula length X greatest width X 0.75, as by planimeter readings of blue-printed leaf outlines. Leaf areas may conveniently be determined from growing plants by this method without injury. 2. Both chlorophyll and carotin were most concentrated in the uppermost leaves and least in the ...
DOI:
10.2134/agronj1933.00021962002500110001x

19. The absorption and movement of sodium chlorate when used as an herbicide

Author:
Loomis, W.E.; Smith, E.V.; Bissey, R.; Arnold, L.E.
Source:
Agronomy journal 1933 v.25 no.11 pp. 724-739
ISSN:
0002-1962
Subject:
soil depth; application rate; perennial weeds; foliar spraying; weed control; sodium chlorate; transpiration; degradation; Zea mays; indicator species; air temperature; leaching; translocation (plant physiology); Cirsium arvense; phloem; water content; xylem; autoclaving; phytotoxicity; Kalanchoe pinnata; absorption; herbicide residues; storage; rhizomes; chemical control; Nerium oleander
Abstract:
... 1. Serum chlorate apparently penetrates readily all of the external surfaces of the plant with the exception of unusually heavy cuticle or corky layers and may be expected to gain entrance to the plant whether applied to the leaves, to herbaceous stems, to rhizomes, or to roots. 2. The data presented indicate that the movement of sodium chlorate within the plant is principally in the xylem and is ...
DOI:
10.2134/agronj1933.00021962002500110002x

20. The value and application of growth curves to field plat experiments

Author:
Klages, K.H.W.
Source:
Agronomy journal 1933 v.25 no.7 pp. 453-464
ISSN:
0002-1962
Subject:
height; plant characteristics; Triticum aestivum; Hordeum vulgare; Avena sativa; Linum usitatissimum; field experimentation; air temperature; crop yield
Abstract:
... Two years' growth data on cereal crops and flax are presented to show that the construction and analysis of growth curves may yield information that can be used to good advantage to supplement yield data from plat experiments, especially insofar as such curves may furnish an index on the basis of which the different seasons encountered in the course of the experiment may be evaluated. Growth curve ...
DOI:
10.2134/agronj1933.00021962002500070003x