Publications from 1990 to 1999 : USDA ARS

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Publications from 1990 to 1999

1990-1999

Author	Year	Title	Journal	PDF
Bowman, R. A., M. F. Vigil, D. C. Nielsen, and R. L. Anderson	1999	Soil organic matter changes in intensively cropped dryland systems	Soil Sci. Soc. Am. J. 63:186-191
Anderson, R. L. R. A. Bowman, D. C. Nielsen, M. F. Vigil, R. M. Aiken, and J. G. Benjamin	1999	Alternative crop rotations for the central great plains	J. Prod. Agric. 12:95-99
Anderson, R. L.	1999	Cultural strategies reduce weed densities in summer annual crops	Weed Tech. 13: 314-319
Nielsen, D. C., R. L. Anderson, R. A. Bowman, R. M. Aiken, M. F. Vigil, and J. G. Benjamin	1999	Winter wheat and proso millet yield reduction due to sunflower in rotation	J. of Prod. Agric., Vol. 12(2)193-197
Skinner, H. R., J. D. Hanson and J. G. Benjamin	1999	Nitrogen uptake and partitioning under alternate- and every-furrow irrigation	Plant and Soil 210:11-20
Aiken, R. M., D. C. Nielsen, M. F. Vigil and L. R. Ahuja	1999	Field evaluation of energy balance simulation of surface soil temperatures	Wind Erosion: An International Symposium/Workshop, USDA-ARS, Manhattan, KS
Halvorson A. D. and C. A. Reule	1999	Long-term nitrogen fertilization benefits soil carbon sequestration	Better Crops with Plant Food (#4)
Anderson, R. L.	1999	Ecology and interference of proso millet (Panicum miliaceum) in semi-arid corn	Weed Tech. 200 (14): 45-50
Vigil, M. F., D. C. Nielsen	1999	Are legumes logical?	Farmer-Stockman Magazine, November, p. 27-30
Nielsen, D. C.	1998	Sunflower water use relationships	USDA-ARS, USDA-NRCS, and Colorado Conservation Tillage Association Fact Sheet #1-98
Nielsen, D. C. and N. O. Nelson	1998	Black bean sensitivity to water stress at various growth stages	Crop Sci. 38(2):422-427
Anderson, R. L.	1998	Seedling emergence of winter annual grasses as affected by limited tillage and crop canopy	Weed Technology 12:262-267
Bowman, R. A. and A. D. Halvorson	1998	Soil chemical changes after nine years of differential N fertilization in a no-till dryland wheat-corn-fallow rotation	Soil Sci. 163:(3) 241-247
Bowman, R. A., J. B. Rodriguez and J. R. Self	1998	Comparison of methods to estimate occluded and resistant soil phosphorus	Soil Sci. Soc. Am. J. 62:338-342
Unger, P. W. and M. F. Vigil	1998	Cover crop effects on soil water relationships	J. of Soil and Water Cons. 53(3) 200-207
Anderson, R. L.	1998	Ecological characteristics of three winter annual grasses	Weed Technology 12:478-483
Anderson R. L., D. L. Tanaka, A. L. Black and E. E. Schweizer	1998	Weed community and species response to crop rotation, tillage, and nitrogen fertility	Weed Technology 12:531-536
Benjamin, J. G. L. K. Porter, H. R. Duke, L. R. Ahuja, and G. Butters	1998	Nitrogen movement with furrow irrigation method and fertilizer band placement	Soil Sci. Soc. Am. J. 62(4) 1103-1108
Nielsen, D. C.	1998	Comparison of three alternative oilseed crops for the Central Great Plains	J. of Production Agriculture 11(3)277-336-341
Bowman, R. A., M. Sucik, M. Rosales, and J. Saunders	1998	Soil quality indicators for whole-farm management in the Central Great Plains	USDA-ARS and USDA-NRCS Conservation Tillage Fact Sheet #2-98
Nielsen, D. C. and R. M. Aiken	1998	Wind speed above and within sunflower stalks varying in height and population	J. Soil & Water Cons. 53(4) 347-352
Nielsen, D. C	1998	Snow catch and soil water recharge in standing sunflower residue	Journal of Production Agriculture 11(4) 476-480
Vigil, M. F. and D. C. Nielsen	1998	Winter wheat yield depression from legume green fallow	Agron. J. 90: 727-734
Ahuja, L. R., F. Fiedler, G. H. Dunn, J. G. Benjamin, and A. Garrison	1998	Changes in soil water retention curve due to tillage and natural reconsolidation	Soil Sci. Soc. Am. J. 62:1228-1233
Bowman, R. A. Commun	1998	A revaluation of the chromic acid colorimetric procedure for soil organic carbon	Soil Sci. Plant Anal, 29(3&4), p. 501-508
Smith, G. M., Vigil, M. F., Davis, J. G	1998	Nitrogen mineralized from manure amended soils	Proceedings of the Great Plains Soil Fertility Conference. v. 7: p. 34-39. Denver, Colo
Bowman, R. A., Vigil, M. F	1998	Dryland sunflowers: Effects on soil organic matter and erosion	Proceedings of the Great Plains Soil Fertility Conference. v. 7: p. 67-73. Denver, Colo
Davis, J. G., Iversen, K. V., Vigil, M. F	1998	Variability of manure nutrient content and impact on manure sampling protocol	In Proceedings Great Plains Soil Fertility Conference. v. 7: p. 237-242. Denver, Colo
Anderson, R. L.	1998	Designing rotations for semiarid region	P. 4-15. In Proc. Annu. Colorado Conserv. Tillage Assoc. Meet., 10^th, Sterling, CO. 3-4 Feb. 1998. Colorado Conserv. Tillage Assoc., Sterling, Colo.
Armstrong, J. S., R. E. Lee, F. B. Peairs	1998	Application of ice-nucleating active bacteria decreases the supercooling capacity of the Russian wheat aphid (Homoptera: Aphididae)
Vigil, M. F., D. C. Nielsen and R. L. Anderson	1997	Cost of production and yields of alternative dryland crops	Conservation Tillage Fact Sheet #2-97
Anderson, R. L.	1997	Oat for forage production, quality, and water use	USDA-ARS and Colorado Conservation Tillage Association Fact Sheet #3-97
Nielsen, D. C.	1997	Water use and yield of Canola under dryland conditions in the Central Great Plains	J. of Prod. Agric, Vol. 10(2) pp. 307-313
Vigil, M. F., R. L. Anderson and W. E. Beard	1997	Base temperature and growing-degree hour requirements for the emergence of canola	Crop Sci. 37:844-849
Follett, R. F., E. A. Paul, S. W. Leavitt, A. D. Halvorson, D. Lyon and G. A. Peterson	1997	Carbon isotope ratios of Great Plains soils and in wheat-fallow systems	Soil Sci. Soc. Am. J. 61:1068-1077
Paul, E. A., R. F. Follett, S. W. Leavitt, A. D. Halvorson, G. A. Peterson and D. J. Lyon	1997	Radiocarbon dating for determination of soil organic matter pool sizes and dynamics	Soil Sci. Soc. Am. J. 61:1058-1067
Aiken, R. M., G. N. Flerchinger, Hamid J. Farahani and Karen E. Johnsen.	1997	Energy balance simulation for surface soil and residue temperatures with incomplete cover	Agron. J. 89:404-415
Nielsen, D. C. R. M. Aiken and G. S. McMaster	1997	Optimum wheat stubble height to reduce erosion and evaporation	USDA-ARS, USDA- NRCS and Colorado Conservation Tillage Association Fact Sheet #4-97
Bowman, R. A.	1997	Field Methods to estimate soil organic matter	USDA-ARS, USDA-NRCS and Colorado Conservation Tillage Association Fact Sheet #5-97
Anderson, R. L.	1997	Cultural systems can reduce reproductive potential of winter annual grasses	Weed Technology 11:608-613
Benjamin, J. G., L. K. Porter, H. R. Duke and L. R. Ahuja	1997	Corn growth and nitrogen uptake with furrow irrigation and fertilizer bands	Agron. J. 89:609-612
Nielsen, D. C.	1997	On-Farm soil water measurements	USDA-ARS, USDA-NRCS and Colorado Conservation Tillage Association Fact Sheet #6-97
Bowman, R. A. and A. D. Halvorson	1997	Crop rotation and tillage effects on phosphorus distribution in the Central Great Plains	Soil Sci. of America J. 61:(5) 1418-1422
Anderson, R. L.	1997	Longspine Sandbur (Cenchrus longispinus) ecology and interference in irrigated corn (Zea mays).	Weed Technology 11:667-671
Tanaka, D. L., R. L. Anderson	1997	Soil water storage and precipitation storage efficiency of conservation tillage systems	J. Of Soil and Water Conservation, Volume 52, (5) p. 363-367
Halvorson, A. D., M. F. Vigil, G. A. Peterson, and E. T. Elliott. In E. A. Paul, K. Paustian, E. T. Elliot, and C. V. Cole	1997	Long-term tillage and crop residue management study at Akron, CO.	Soil organic matter in temperate agroecosystems, long-term experiments in North America. CRC Press, New York
Nielsen, D. C., and S. E. Hinkle	1996	Field evaluation of basal crop coefficients for corn based on growing degree days, growth stage, or time	Am. Soc. of Agric. Engineers 39:(1)97-103
Bowman, R. A., and M. Petersen	1996	Soil organic matter levels in the Central Great Plains	Conservation Tillage Facts #1-96
Anderson, R. L., D. J. Lyon, and D. L. Tanaka	1996	Weed management strategies for conservation-tillage sunflower (Helianthus annuus).	Weed Technology. 10:55-59
Nielsen, D. C.	1996	Estimating corn yields from precipitation records	Conservation Tillage Facts #2-96
Bowman, R. A., R. L. Anderson, D. C. Nielsen, M. F. Vigil, and A. D. Halvorson	1996	Effects of cropping intensity on soil organic matter and aggregate stability	Proceedings, Great Plains Soil Fertility Conference. Pages 174-182
Vigil, M. F., and D. C. Nielsen	1996	The effect of legumes in a green fallow rotation on winter wheat yields	Proceedings, Great Plains Soil Fertility Conference. Pages 169-173
Doran, J. W., A. Kessavalou, G. L. Hutchinson, M. F. Vigil, and A. D. Halvorson	1996	Influence of cropping/tillage management on soil fertility and quality of former CRP land in the Central High Plains	Proceedings, Great Plains Soil Fertility Conference. Pages 205-211
Aiken, R. M. and A. J. M. Smucker	1996	Root system regulation of whole plant growth	Annu. Rev. Phytopathol. 34:324-347
Armstrong, J. S. and F. B. Peairs	1996	Environmental parameters related to winter mortality of the Russian wheat aphid (homoptera: aphididae):	Basis for predicting mortality. J. of Economic Entomology 89(5) 1281-1287
Anderson, R. L. and D. C. Nielsen	1996	Emergence pattern of five weeds in the Central Great Plains	Weed Tech. 10:744-749
Anderson, R. L.	1996	Downy Brome (Bromus tectorum) emergence variability in a semiarid region	Weed Tech. 10:750-753
Nielsen, D. C.	1996	Potential of canola as a dryland crop in northeastern Colorado	pp 281-287. In: J. Janik (ed.), Progress in New Crops. Am. Soc. Hort. Sci., Alexandria, VA.
Johnson, C. K., M. F. Vigil, K. G. Doxtader and W. E. Beard	1996	Measuring bacterial and fungal substrate-induced respiration in dry soils	Soil Biol. Biochem. 28:(4/5) 427-432
Anderson, R. L., and A. D. Halvorson	1996	Sod control when rotating back to cropland, guided by plant biology	18^th Annual Advancing the Art Proceedings. Jan. 29-31, 1996. Manitoba-North Dakota Zero Tillage Farmers Association Workshop. p. 167-177
Anderson, R. L.	1996	Plant and environmental factors affecting systemic herbicide performance	USDA-ARS, Central Great Plains Research Station, Akron, CO. p. 1-6
Holtzer, T. O., R. L. Anderson, M. P. McMullen, F. B. Peairs	1996	Integrated pest management of insects, plant pathogens, and weeds in dryland cropping systems of the Great Plains	J. Prod. Agric., Vol. 9, no. 2, pgs. 200-208
Kasele, I. N., J. F. Shanahan, and D. C. Nielsen	1995	Impact of growth retardants on corn leaf morphology and gas exchange traits	Crop Sic. 35:190-194
Anderson, R. L.	1995	Control strategies for jointed goatgrass, volunteer rye, and downy brome	Conservation Tillage Fact Sheet, 1#95
Vigil, M. F.	1995	Factors affecting the rate of crop residue decomposition under field conditions	Conservation Tillage Fact Sheet, 3#95
Nielsen, D. C.	1995	Water use/yield relationships for central Great Plains crops	Conservation Tillage Fact Sheet, 2#95
Nielsen, D. C., H. J. Lagae, and R. L. Anderson	1995	Time-domain reflectometry measurements of surface soil water content	Soil Sci. Soc. of Am. J. 59(1)104-105
Baltensperger D., D. Lyon, R. L. Anderson	1995	Producing and Marketing Proso Millet in the High Plains	Univ. of Nebraska Cooperative Extension Fact Sheet, EC95-137-C.
Baltensperger, D. D., L. A. Nelson, G. E. Frickel, and R. L. Anderson	1995	Registration of "Huntsman" Proso Millett	Crop Sci. 35:(3)941
Vigil, M. F.	1995	Fertilizer in dryland cropping systems: a brief overview	Conservation Tillage Fact Sheet #4-95
Vigil, M. F., D. C. Nielsen, A. D. Halvorson, and B. Beard	1995	Dryland canola production: variety selection, nitrogen response, and water use in the central great plains	Proc. Western Canola Development Meeting, pp. 129-133
Vigil, M. F. and S. E. Hinkle	1995	Residue cover reduction as affected by tillage sequence. A Future Using Residue Management	Proc. of Great Plains Residue Management Conference, pp. 21-33
Vigil, M. F., D. C. Nielsen, R. L. Anderson, and R. A. Bowman	1995	The benefits of no-till and reduce-till dryland cropping systems	Proc. Symposium on Natural Agriculture, Gardening and Housing, pp. 63-69
Vigil, M. F., D. C. Nielsen, R. L. Anderson, and R. A. Bowman	1995	Taking advantage of the benefits of no-till	Conservation Tillage Facts Sheet #4-95
Vigil, M. F. and D. E. Kissel	1995	Rate of Nitrogen Mineralized from Incorporated Crop Residues as Influenced by Temperature	Soil Sci. Soc. Am. J. 59:1636-1644
Armstrong, J. S., S. D. Pilcher, and B. C. Kondratieff	1995	Two chloropid flies (Diptera: Chloropidae) infesting proso millet (panicum miliaceum L.) in Northeastern Colorado	J. of the Kansas Entomological Soc., pp. 478-479
Elliott, N. C., J. D. Burd, J. S. Armstrong, C. B. Walker, D. K. Reed, and F. B. Peairs	1995	Release and recovery of imported parasitoids of the Russian wheat aphid in Eastern Colorado	Southwestern Entomologist. 20:(2)125-129
Kasele, I. N., F. Nyirenda, J. F. Shanahan, D. C. Nielsen, and R. d'Andria	1994	Ethephon alters corn growth, water use, and grain yield under drought stress	Agron. J. 86:282-288
Anderson, R. L.	1994	Characterizing weed community seedling emergence for a semiarid site in Colorado	Weed Technol. 8:245-249
Nielsen, D. C. and R. L. Anderson	1994	Photosynthesis and transpiration response of redwood pigweed (Amaranthus retroflexus).	Weed Technol. 8:265-269
Sharpley, A. N. and A. D. Halvorson	1994	The management of soil phosphorus availability and its impact on surface water quality	p. 7-80, in (ed.) R. Lal and B. A. Stewart, Soil Progress and Water Quality, ASA Advances in Soil Science. Lewis Publishers
Halvorson, A. D. and C. A. Reule	1994	Nitrogen fertilizer requirements in an annual dryland cropping system	Agron. J. 86(2):315-318
Halvorson, A. D., R. L. Anderson, N. E. Toman, and J. R. Welsh	1994	Economic comparison of three winter wheat-fallow tillage systems	J. Prod. Agric. 7:381-385
Anderson, R. L.	1994	Planting date effect on no-till proso millet	J. Prod. Agric. 7(4):454-458
Nielsen, D. C.	1994	Non water-stressed baselines for sunflowers	Agricultural Water Management 26:265-276
Cabrera M. L., M. F. Vigil, and D. E. Kissel	1994	Potential nitrogen mineralization: Laboratory and field evaluation	Soil Sci. Soc. of Am. p. 15-30
Halvorson, A. D.	1993	Soil	McGraw-Hill Encyclopedia of Sci. and Technology. Pp. 385-389
Swanton, C. J., K. N. Harker, and R. L. Anderson	1993	Crop losses due to weeds in Canada	Weed Technology 7:537-542
Johnson, C. K.	1993	Microbial respiration in soil: What are the Relative contributions of bacteria and fungi?	MS thesis, Dept. of Agronomy, Colorado State University, Fort Collins, CO, summer 1993
Anderson, R. L.		Jointed goatgrass (Aegilops cylindrica) ecology and interference in winter wheat	Weed Science 41:388-393. 279
Nielsen, D. C., and R. L. Anderson	1993	Managing residue & storing precipitation	Conservation tillage fact sheet #2-93
Anderson, R. L.		Crop residue reduces jointed goatgrass (Aegilops cylindrica ) seedling growth	Weed Technology 7:717-722
Armstrong, J. S., F. B. Peairs, S. D. Pilcher, and C. C. Russell	1993	The effect of planting time insecticides and liquid fertilizer on the Russian wheat aphid (Homoptera: Aphididae) and lesion nematode (Pratylenchus thoreni ) on winter wheat	Journal of the Kansas Entomological Society. 66:69-74
Francis, D. D., J. S. Schepers, and M. F. Vigil	1993	Post-Anthesis nitrogen loss from corn	Agron. J. 85:659-663
Commun. Pierzynski, G. M., M. F. Vigil, and D. E. Kissel	1993	Urea Nitricphosphate for Cool-Season Grass Production	Soil Sci. Plant Anal. 24(13&14), 1665-1681
Blackmer T. M., J. S. Schepers, and M. F. Vigil	1993	Chlorophyll meter readings in corn as affected by plant spacing	Commun. Soil Sci. Plant Anal. 24(17&18):2507-2516
Vigil, M. F., D. E. Kissel, M. L. Cabrera, and C. W. Raczkowski	1993	Optimal spacing of surface-banded nitrogen on fescue	Soil Sci. Soc. of Am. J. 57(6):1629-1633
Bowman, R. A. and J. O. Moir	1993	Basic EDTA as an extractant for soil organic phosphorus	Soil Sci. Soc. of Am. J. 57(6):1516-1518
Lyon D. J., and R. L. Anderson	1993	Crop response to fallow applications of atrazine and clomazone	Weed Technol. 7:949-953
Hinkle, S. E., W. L. Kranz, D. G. Watts, and D. C. Nielsen	1993	Corn crop coefficients based on growing degree days or growth stage	ASAE Paper No. 932523
Nielsen. D. C. and S. E. Hinkle	1993	Field evaluation of corn crop coefficients based on growing degree days or growth stage	ASAE Paper No. 9332524
Halvorson, A. D., R. L. Anderson, S. E. Hinkle, D. C. Nielsen, R. A. Bowman, and M. F. Vigil	1993	Alternative crop rotations to winter wheat-fallow	Proceedings of the Great Plains soil fertility conference, Denver, Co. p. 11
Peterson, G. A., D. G. Westfall, and A. D. Halvorson	1992	Economics of dryland crop rotations for efficient water and nitrogen use	In Proc. 1992 Great Plains Soil Fertility Conference Workshop, Denver, Colorado, March 3-4, 1992. Vol. 4:47-53. Kansas State University
Vigil, M. F., J. C. Yeamans, and R. E. Lamond	1992	An overview of nitrification inhibitors and slow release fertilizers	In Proc. 1992 Great Plains Soil Fertility Conference Workshop, Denver, Colorado, March 3-4, 1992. Vol. 4:77-83. Kansas State University
Fixen, P. E. and A. D. Halvorson	1992	Land tenure effects on phosphorus management	In Proc. 1992 Great Plains Soil Fertility Conference Workshop, Denver, Colorado, March 3-4, 1992. Vol. 4:106-110. Kansas State University
Halvorson, A. D. and J. L. Havlin	1992	Response of dryland winter wheat to residual P	In Proc. 1992 Great Plains Soil Fertility Conference Workshop, Denver, Colorado, March 3-4, 1992. Vol. 4:201-206. Kansas State University
Eckhoff, J. L. A., J. W. Bergman, M. J. Weiss, and A. D. Halvorson	1992	Seed spacing for nonthinned sugarbeet production	Montana Ag Research 9(1):6-9
Nielsen, D. C. and A. D. Halvorson	1992	Nitrogen makes winter wheat big- and thirsty	Colorado Rancher and Farmer 46(7): 30
Follett, R. H., R. F. Follett, and A. D. Halvorson	1992	Use of a chlorophyll meter to evaluate the nitrogen status of dryland winter wheat	Commun. Soil Sci. Plant Anal., 23(7&8), 687-697
Bowman, R. A. and D. J. Savory	1992	Phosphorus distribution in calcareous soil profiles of the Central Plains	Soil Sci. Soc. Am. J. 56:423-426
Halvorson, A. D	1992	Management for residual fertilizer phosphorus in soils	In Proc. of Future Directions for Agricultural Phosphorus Research workshop, Tennessee Valley Authority, Muscle Shoals, Alabama. TVA Bulletin Y-224 pp. 116-120
Halvorson, A. D. and J. L. Havlin	1992	No-till winter wheat response to phosphorus placement and rate	Soil Sci. Soc. Am. J. 56:1635-1639
Gardner, B. R., D. C. Nielsen, and C. C. Shock	1992	Infrared thermometry and the crop water stress index	I. History, theory, and baselines. J. in Prod. Agric. 5:462-466
Gardner, B. R., D. C. Nielsen, and C. C. Shock	1992	Infrared thermometry and the crop water stress index	II. Sampling procedures and interpretation. J. Prod. Agric. 5:466-475
Schepers, J. S., D. D. Francis, M. F. Vigil, and F. E. Below	1992	Comparison of corn leaf nitrogen concentration and chlorophyll meter readings	Commun. Soil Sci. Plant Anal. 23(17-20):2173-2187
Hinkle, S. E.	1992	Wheel ridges, concepts, construction, yields	ASAE Paper No. 921593. Nashville, TN
Tanaka, D. L. and R. L. Anderson	1992	Fallow method affects downy brome population in winter wheat	J. Prod. Agric. 5(1): 117-119
Bowman, R. A., and D. J. Savory	1992	Phosphorus distribution in calcareous soil profiles of the Central Plains	Soil Sci. Soc. Am. J. 56:423-426
Smika, D. E.	1992	Cereal systems of the North American central great plains	Field Crop Ecosystems 18:401-412
Anderson, R. L. J. D. Hanson, M. J. Shaffer, D. A. Ball, and C. V. Cole	1991	Response of proso millet to a no-till production system	Pages 187-192 in:Sustainable Agriculture for the Great Plains, Symposium proceedings. USDA, ARS-89. 255pp
Anderson, R. L. and D. C. Nielsen	1991	Winter wheat (Triticum aestivum ) growth state effect on paraquat bioactivity	Weed Technology. 5:439-441
Fixen, P. E. and A. D. Halvorson	1991	Optimum Phosphorus Management for Small Grain Production	Better Crops with Plant Food Vol. LXXV(75), No. 3 Pages 26-29
Follett, R. F., L. K. Porter, and A. D. Halvorson	1991	Border effect on nitrogen-15 fertilized winter wheat microplots grown in the Great Plains	Agron. J. 83:608-612
Halvorson. A. D.	1991	One-Shot phosphorus gives years of high returns	Colorado Rancher and Farmer 45(3): 60-61
Hinkle, S. E	1991	A modified empirical drag cofficient for water drop ballistics	Applied Engineering in Agriculture 7:75-80
Hinkle, S. E., J. D. Hanson, M. J. Shaffer, D. A. Ball, and C. V. Cole	1991	Winter wheat emergence reduction following simulated rainfall	Pages 179-186 in: Sustainable Agriculture for the Great Plains, Symposium Proceedings. USDA-ARS, ARS-89, 255 PP
D. C. Nielsen, and A. D. Halvorson	1991	Influence of nitrogen fertility on water use, water stress, and yield of winter wheat in the Central Great Plains	Pages 171-178 in: J. D. Hanson, M. J. Shaffer, D. A. Ball, and C. V. Cole (eds.), Sustainable Agriculture for the Great Plains, Symposium Proceedings. USDA-ARS, ARS-89, 255 pp
Pierce, F. J., M. J. Shaffer, and A. D. Halvorson	1991	Screening procedure for estimating potentially leachable nitrate-nitrogen below the root zone	p. 259-283. Chapter 12. In R. F. Follett, et al. (Eds.), Managing Nitrogen for Groundwater Quality and Farm Profitability. Soil Sci. Soc. of America, Madison, WI.
Riggle, B. D.	1991	Development of a preliminary enzyme-linked immunosorbent assay for the herbicide trifluralin	Bul. Environmental contamination and toxicology. 46:404-409
Shaffer, M. J., A. D. Halvorson, and F. J. Pierce	1991	Nitrate leaching and economic analysis package (NLEAP):	Model description and application. p. 285-322. Chapter 13. In R. F. Follett, et al. (Eds.), Managing Nitrogen for Groundwater Quality and Farm Profitability. Soil Sci. Soc. of America, Madison, WI.
Halvorson, A. D and J. L. Havlin	1991	Response of winter wheat in the Central Great Plains to high rates of phosphorus fertilizer	p. 108-111. In Proc., Western Phosphate and Sulfur Workgroup, Colorado State University, Fort Collins, CO, March 21-22, 1991
Vigil, M. F. and D. E. Kissel	1991	Equations for estimating the amount of nitrogen mineralized from crop residues	Soil Sci. Soc. Am. J. 55:(3)757-761
Vigil, M. F., D. E. Kissel, and S. J. Smith	1991	Field crop recovery and modeling of nitrogen mineralized from labeled sorghum residues	Soil Sci. Soc. Am. J. 55:(4)1031-1037
Anderson, R. L.	1991	Timing of nitrogen application affects downy brome (Bromus tectorum ) growth in winter wheat	Weed Technol. 5:582-585
Nielsen, D. C. and A. D. Halvorson	1991	Nitrogen fertility influence on water stress and yield of winter wheat	Agron. J. 83:1065-1070
Hinkle, S. E., D. C. Nielsen, and J. Scott Armstrong	1991	Dynamic time response of teflon-coated thermocouples	Transactions of the Amer. Soc. of Ag. Engineers Paper No. 91-3527. Chicago, IL.
Armstrong, J. S., M. R. Porter, and F. B. Peairs	1991	Alternate hosts of the russian wheat aphid (Homoptera: Aphididae ) in northeastern Colorado	J. Econ. Entomol. 84(6): 1691-1694
Bowman, R. A.	1991	Spatial variability of selected carbon, nitrogen, and phosphorus parameters on acid and calcareous rangeland soils	Commun. Soil Sci. and Plant Anal. 22:205-212
Bowman, R. A., W. D. Guenzi, and D. J. Savory	1991	Spectroscopic method for estimation of soil organic carbon	Soil Sci. Soc. Am. J. 55:563-566
Eckhoff, J. L. A., A. D. Halvorson, M. J. Weiss, and J. W. Bergman	1991	Seed spacing for nonthinned sugarbeet production	Agron. J. 83:929-932
Anderson, R. L.	1990	No-till proso millet production	Agron. J. 82: 577-580
Anderson, R. L.	1990	Tolerance of safflower (Carthamustinctorius), corn (Zeamays), and proso millet (Panicummiliaceum to clomazone	Weed Technol. 4:606-611
Armstrong, J. S.	1990	Chemical control and alternate host plants of the Russian wheat aphid. In Pest status and control of the Russian wheat aphid, Diuraphis noxia (mordvilko), (Homoptera: Aphididae)	A Review. Technical Bulletin 588, Purdue University. Pg. 23
Dunbar, B. D.,B. Riggle,and G. Niswender	1990	Development of enzyme immunoassay for the detection of triazine herbicides	J. of Agric. and Food Chemistry. 38 (2): 433-437
Halvorson, A. D	1990	Cropping systems and fertilization for efficient water use and sustainability	p. 51-57. In Proc. 1990 Great Plains Soil Fertility Conference, March 6-7, 1990, Denver, CO. Kansas State University, vol. 3:51-57
Halvorson, A. D.	1990	Management of dryland saline seeps	p. 372-392. Chapter 17. In Agricultural Salinity Assessment and Management. (K. K. Tanji, editor) ASCE Manuals and Reports on Engineering Practice No. 71
Halvorson, A. D	1990	Cropping systems and N fertilization for efficient water use in the Central Great Plains	In Proc. Great Plains Conservation Tillage Symposium. Great Plains Agricultural Council Bulletin No. 131
Havlin, J. L. and A. D. Halvorson	1990	Phosphorus requirements for high yield wheat management	p. 82-95. In Proc. MEY Wheat Management Conference, March 7-9, 1990, Denver, CO. Potash and Phosphate Institute, Atlanta, GA.
Hinkle, S. E.	1990	Max Emergence, get better wheat populations with reduced tillage, flat press wheels-even after a rain	Colorado Rancher and Farmer. 44(6):18
Hinkle, S. E.	1990	The Akron USDA-Agricultural Research Service portable boom-mounted rainfall simulator	Transactions of the Amer. Soc. of Ag. Engineers (33(3):818-820
Hinkle, S. E.	1990	Wheat yield reduction due to erosion from simulated rainfall	Amer. Soc. of Ag. Engineers Paper No. 90-2569. Chicago IL.
Hinkle, S. E.	1990	Wheat growers in the U. S. can now avoid a costly wait	USDA Ag. Research Service Quarterly Report, April-June, 1990(2):9. [HRt]
Nielsen,D. C.	1990	Scheduling irrigations for soybeans with the Crop Water Stress Index (CWSI).	Field Crops Res. 23:103-116
Onken, A. B., C. W. Wendt, and A. D. Halvorson	1990	Soil fertility and water use efficiency
Riggle, B., and B. D. Dunbar	1990	Development of enzyme immunoassay for the detection of the herbicide norflurazon	J. of Agric. and Food Chemistry 38:1922-1925
Smika, D. E.	1990	Fallow management practices for wheat production in the Central Great Plains	Agron. J. 82:319-323
Bowman, R. A., Reeder, J. D., Lober, R. W	1990	Changes in soil properties in a central plains rangeland soil after 3, 20, and 60 years of cultivation	Soil Science. 50(6):851-857

U.S. DEPARTMENT OF AGRICULTURE

Central Great Plains Resources Management Research: Akron, CO