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Agricultural Research Service United States Department of Agriculture
 
Gary E. Varvel

Soil Scientist


Publications (Clicking on the reprint icon Reprint Icon will take you to the publication reprint.)
Carbon source quality and placement effects on soil organic carbon status - (Peer Reviewed Journal)
Wienhold, B.J., Varvel, G.E., Johnson, J.M., Wilhelm, W.W. 2013. Carbon source quality and placement effects on soil organic carbon status. BioEnergy Research. 6:786-796. Available: http://link.springer.com/content/pdf/10.1007%2Fs12155-013-9301-z.pdf.
Corn stover management effects on soil organic carbon contents from several U.S. locations - (Abstract Only)
Johnson, J.M., Varvel, G.E., Stott, D.E., Osborne, S.L., Novak, J.M., Karlen, D.L., Lamb, J., Baker, J.M. 2012. Corn stover management effects on soil organic carbon contents from several U.S. locations. Meeting Abstract. [abstract] 2012 Sun Grant Conference. p. 40.
Corn stover harvest: Likely effects on soil productivity - (Experiment Station)
Wortman, C., Varvel, G.E. 2012. Corn stover harvest: Likely effects on soil productivity. Extension Publications. Available: http://cropwatch.unl.edu/web/cropwatch/archive?articleID=4968806.
Corn stover removal impacts on soil greenhouse gas emissions in irrigated continuous corn systems - (Abstract Only) - (28-Jun-12)
Influence of corn stover harvest on soil quality assessments at multiple locations across the U.S. - (Proceedings) - (12-Jun-12)
Greenhouse gas fluxes in response to corn stover harvest - (Abstract Only) - (11-Jun-12)
Corn and soybean grain yields in a long-term tillage and cropping systems study - (Abstract Only)
Varvel, G.E., Wilhelm, W.W. 2012. Corn and soybean grain yields in a long-term tillage and cropping systems study [abstract]. ASA-CSSA-SSSA Annual Meeting Abstracts. Poster No. 401-30.
Soil carbon sequestration by switchgrass and no-till maize grown for bioenergy Reprint Icon - (Peer Reviewed Journal)
Vogel, K.P., Follett, R.F., Varvel, G.E., Mitchell, R., Kimble, J. 2012. Soil carbon sequestration by switchgrass and no-till maize grown for bioenergy. BioEnergy Research. DOI 10.1007/s12155-012-9198-y.
Soil carbon sequestration in central USA agroecosystems - (Book / Chapter)
Cambardella, C.A., Johnson, J.M., Varvel, G.E. 2012. Soil carbon sequestration in central USA agroecosystems. In Liebig, M.A., Franzluebbers, A.J., Follett, R.F., editors. Managing Agricultural Greenhouse Gases: Coordinated Agricultural Research through GRACEnet to Address our Changing Climate. San Diego, CA: Elsevier Publ. p. 41-58.
Corn stover removal affects on soil carbon in an irrigated system - (Abstract Only)
Varvel, G.E., Wilhelm, W.W. 2011. Corn stover removal affects on soil carbon in an irrigated system [abstract]. ASA-CSSA-SSSA Annual Meeting Abstracts. Paper No. 374-4.
Making the practitioner the researcher – reflections of co-workers - (Abstract Only)
Wienhold, B.J., Varvel, G.E., Drijber, R.A. 2011. Making the practitioner the researcher – reflections of co-workers. ASA-CSSA-SSSA Annual Meeting Abstracts. Available: http://a-c-s.confex.com/crops/2011am/webprogram/Paper67331.html.
Field emissions of greenhouse gases from contrasting biofuel feedstock production systems under different N fertilization rates - (Abstract Only)
Jin, V.L., Varvel, G.E., Wienhold, B.J., Schmer, M.R., Mitchell, R., Vogel, K.P. 2011. Field emissions of greenhouse gases from contrasting biofuel feedstock production systems under different N fertilization rates. Abstract #135-5. ASA-CSSA-SSSA Annual Meeting Abstracts. Abstract #135-5.
Corn cob residue carbon and nutrient dynamics during decomposition - (Peer Reviewed Journal)
Wienhold, B.J., Varvel, G.E., Jin, V.L. 2011. Corn cob residue carbon and nutrient dynamics during decomposition. Agronomy Journal. 103:1192-2297. Available: doi:102134/agronj2011.0002.
No-tillage increases soil profile carbon and nitrogen under long-term rainfed cropping systems - (Peer Reviewed Journal)
Varvel, G.E., Wilhelm, W.W. 2011. No-tillage increases soil profile carbon and nitrogen under long-term rainfed cropping systems. Soil and Tillage Research. Available: doi:10.1016/j.still.2011.03.005.
Potential Greenhouse Gas Emissions from Two Switchgrass Cultivars under Different N Fertilization Rates - (Abstract Only)
Jin, V.L., Varvel, G.E., Wienhold, B.J., Mitchell, R., Vogel, K.P. 2010. Potential Greenhouse Gas Emissions from Two Switchgrass Cultivars under Different N Fertilization Rates. Abstract #338-2. ASA-CSSA-SSA Annual Meeting Abstracts (CDROM), 1-3 Nov., 2010, Long Beach, CA.
Sampling Protocols. Chapter 1. Guidelines for site description and soil sampling, processing, analysis, and archiving - (Book / Chapter)
Liebig, M.A., Varvel, G.E., Honeycutt, C.W. 2010. Sampling Protocols. Chapter 1. Guidelines for site description and soil sampling, processing, analysis, and archiving. IN: GRACEnet Sampling Protocols. R.F. Follett, editor. p. 1-1 to 1-5. Available at http://www.ars.usda.gov/research/GRACEnet.
Balancing limiting factors and economic drivers for sustainable midwestern U.S. agricultural residue feedstock supplies Reprint Icon - (Peer Reviewed Journal)
Wilhelm, W.W., Hess, J.R., Karlen, D.L., Johnson, J.M., Muth, D.J., Baker, J.M., Gollany, H.T., Novak, J.M., Stott, D.E., Varvel, G.E. 2010. Balancing limiting factors and economic drivers for sustainable midwestern U.S. agricultural residue feedstock supplies. Industrial Biotechnology. 6(5):271-287.
Long-term cropping systems study - (Experiment Station)
Varvel, G.E. 2010. Long-term Cropping Systems Study. Nebraska Agricultural Experiment Station Bulletin. September/October 2010. 14(5):2. Available: http://ardc.unl.edu/2010SeptemberOctoberExtendedVisions.pdf
Soil profile organic carbon as affected by tillage and cropping systems - (Abstract Only)
Varvel, G.E., Wilhelm, W.W. 2010. Soil profile organic carbon as affected by tillage and cropping systems. [abstract]. American Society of Agronomy Meetings, September 1, 2010, Long Beach, California. 2010 CDROM. Abstract No. 236-6.
Monitoring soil quality to assess the sustainability of harvesting corn stover - (Peer Reviewed Journal)
Karlen, D.L., Varvel, G.E., Johnson, J.M., Baker, J.M., Osborne, S.L., Novak, J.M., Adler, P.R., Roth, G., Birrell, S. 2010. Monitoring soil quality to assess the sustainability of harvesting corn stover. Agronomy Journal. 103:288–295.
Long-Term Soil Organic Carbon as Affected by Tillage and Cropping Systems Reprint Icon - (Peer Reviewed Journal)
Varvel, G.E., Wilhelm, W.W. 2010. Long-Term Soil Organic Carbon as Affected by Tillage and Cropping Systems. Soil Science Society of America Journal. 74:3 915-921. Available: http://soil.scijournals.org/cgi/content/abstract/74/3/915?etoc
Developing Field Studies to Measure Corn Residue Removal Effects on Soil Organic Matter - A Multi-Location Approach - (Abstract Only)
Varvel, G.E., Karlen, D.L., Baker, J.M., Johnson, J.M., Osborne, S.L., Novak, J.M. 2009. Developing Field Studies to Measure Corn Residue Removal Effects on Soil Organic Matter - A Multi-Location Approach [abstract]. ASA-CSSA-SSSA Annual Meeting, November 1-5, 2009, Pittsburgh, Pennsylvania. 2009 CDROM. Abstract No. 163-7.
Cob biomass production in the western corn belt Reprint Icon - (Peer Reviewed Journal)
Varvel, G.E., Wilhelm, W.W. 2008. Cob biomass production in the western corn belt. BioEnergy Research. 1(3-4):223-228.
Corn stover removal reduces grain yield on marginal soils Reprint Icon - (Research Technical Update)
Varvel, G.E. 2009. Corn stover removal reduces grain yield on marginal soils. Natural Resources Research Update (NRRU). Update #238672. Available at: http://hdl.handle.net/10113/17521.
Cropping system diversity maintains or even improves soil organic carbon levels Reprint Icon - (Research Technical Update)
Varvel, G.E. 2009. Cropping system diversity maintains or even improves soil organic carbon levels. Natural Resources Research Update (NRRU). Update #238676. Available at: http://hdl.handle.net/10113/4144.
Cropping systems with corn residue production levels sufficient to maintain or even improve soil organic carbon levels and allow partial removal for biofuel production Reprint Icon - (Research Technical Update)
Varvel, G.E. 2009. Cropping systems with corn residue production levels sufficient to maintain or even improve soil organic carbon levels and allow partial removal for biofuel production. Natural Resources Research Update (NRRU). Update #238677. Available at: http://hdl.handle.net/10113/14703 and http://hdl.handle.net/10113/18315.
Container and Installation Time Effects on Soil Moisture and Temperature and Inorganic Nitrogen Retention for an In Situ Mineralization Method Reprint Icon - (Peer Reviewed Journal)
Wienhold, B.J., Varvel, G.E., Wilhelm, W.W. 2009. Container and Installation Time Effects on Soil Moisture and Temperature and Inorganic Nitrogen Retention for an In Situ Mineralization Method. Communications in Soil Science and Plant Analysis. 40:2044-2057.
Potential Harvestable Corn Cob Biomass in Several Production Systems in the Western Corn Belt - (Abstract Only)
Varvel, G.E., Wilhelm, W.W. 2008. Potential Harvestable Corn Cob Biomass in Several Production Systems in the Western Corn Belt. American Society of Agronomy, October 5-9,2008, Houston, Texas. Abstract No. 546-2.
Contributions of Soil Archives to Understand Soil and Agroecosystem Change - (Abstract Only)
Liebig, M.A., Varvel, G.E., Potter, K.N. 2008. Contributions of Soil Archives to Understand Soil and Agroecosystem Change. IN: ASA-CSSA-SSSA Annual Meeting Abstracts (CDROM), 5-9 October 2008. Houston, TX.
No-Till Corn after Bromegrass: Effect on Soil C and Soil Aggregates - (Peer Reviewed Journal)
Follett, R.F., Varvel, G.E., Kimble, J., Vogel, K.P. 2009. No-Till Corn after Bromegrass: Effect on Soil C and Soil Aggregates. Agronomy Journal. Vol. 101: 261-268.
Soil carbon levels in irrigated Western Corn Belt rotations - (Peer Reviewed Journal)
Varvel, G.E., Wilhelm, W.W. 2008. Soil carbon levels in irrigated Western Corn Belt rotations. Agronomy Journal. 100:1180-1184.
Soil carbon levels in irrigated Western Corn Belt cropping systems - (Abstract Only)
Varvel, G.E., Wilhelm, W.W. 2007. Soil carbon levels in irrigated Western Corn Belt cropping systems. Agronomy Abstracts #204-2.
Climate and soil effects on resilience of corn grain yield - (Abstract Only)
Francis, D.D., Schepers, J.S., Varvel, G.E., Shanahan, J.F. 2007. Climate and soil effects on resilience of corn grain yield. Agronomy Abstracts #295-3.
Protocol comparison for quantifying in situ mineralization - (Abstract Only)
Wienhold, B.J., Varvel, G.E., Wilhelm, W.W. 2007. Protocol comparison for quantifying in situ mineralization. Agronomy Abstracts.
Comparison of corn and switchgrass on marginal soils for bioenergy - (Peer Reviewed Journal)
Varvel, G.E., Vogel, K.P., Mitchell, R., Follett, R.F., Kimble, J.M. 2008. Comparison of corn and switchgrass on marginal soils for bioenergy. Biomass and Bioenergy 32:18-21.
An algorithm for corn nitrogen recommendations using a chlorophyll meter based sufficiency index - (Peer Reviewed Journal)
Varvel, G.E., Wilhelm, W.W., Shanahan, J.F., Schepers, J.S. 2007. An algorithm for corn nitrogen recommendations using a chlorophyll meter based sufficiency index. Agronomy Journal 99:701-706.
Nitrogen Fertilizer Applications for Corn Based on Sufficiency Index Calculations - (Abstract Only)
Varvel, G.E., Wilhelm, W.W., Shanahan, J.F., Schepers, J.S. 2006. Nitrogen Fertilizer Applications for Corn Based on Sufficiency Index Calculations. In Annual meeting abstract [CD-ROM]. ASA, CSSA, SSSA, Madison WI.
IN-SEASON N MANAGEMENT FOR IRRIGATED CORN USING CHLOROPHYLL METERS - (Abstract Only)
Varvel, G.E., Shanahan, J.F., Wilhelm, W.W., Schepers, J.S. 2006. In-season n management for irrigated corn using chlorophyll meters. Agronomy Abstracts.
Crop Residue as Feedstock for the New Bioeconomy: Opportunities and Roadblocks - (Abstract Only)
Wilhelm, W.W., Varvel, G.E., Karlen, D.L., Johnson, J.M., Baker, J. 2006. Crop Residue as Feedstock for the New Bioeconomy: Opportunities and Roadblocks. In Annual meeting abstract [CD-ROM]. ASA, CSSA, SSSA. Madison, WI.
In-season nitrogen recommendations for corn - (Proceedings)
Varvel, G.E., Schepers, J.S., Wilhelm, W.W., Shanahan, J.F., Francis, D.D. 2006. In-season nitrogen recommendations for corn. North Central Extension Industry Soil Fertility Conference Proceedings. 2006 Des Moines, IA. 22:72-77.
SOIL ORGANIC CARBON CHANGES IN DIVERSIFIED ROTATIONS OF THE WESTERN CORN BELT Reprint Icon - (Peer Reviewed Journal)
Varvel, G.E. 2006. Soil organic carbon changes in diversified rotations of the western corn belt. Soil Science Society of America Journal 70:426-433.
GREAT PLAINS CROPPING SYSTEM STUDIES FOR SOIL QUALITY ASSESSMENT - (Peer Reviewed Journal)
Varvel, G.E., Riedell, W.E., Deibert, E., Mcconkey, B., Tanaka, D.L., Vigil, M.F., Schwartz, R.C. 2006. Great plains cropping system studies for soil quality assessment. Renewable Agriculture and Food System 21:3-14.
IN-SEASON N MANAGEMENT FOR IRRIGATED CORN USING CHLOROPHYLL METERS - (Abstract Only)
Varvel, G.E., Shanahan, J.F., Wilhelm, W.W., Schepers, J.S. 2005. In-season n management for irrigated corn using chlorophyll meters. Agronomy Abstracts.
CORN STALK NITRATE CONCENTRATION PROFILE - (Peer Reviewed Journal)
Wilhelm, W.W., Varvel, G.E., Schepers, J.S. 2005. Corn stalk nitrate concentration profile. Agronomy Journal 97:1502-1506.
CROPPING SYSTEM EFFECTS ON SOIL QUALITY IN THE GREAT PLAINS: SYNTHESIS FROM A REGIONAL PROJECT - (Peer Reviewed Journal)
Wienhold, B.J., Pikul Jr, J.L., Liebig, M.A., Mikha, M.M., Varvel, G.E., Andrews, S.S., Doran, J.W. 2005. Cropping system effects on soil quality in the great plains: synthesis from a regional project. Renewable Agriculture and Food System 21:49-59.
CAN PERENNIAL GRASS PASTURES BE PROFITABLE IN THE GREAT PLAINS? - (Popular Publication)
Mitchell, R., Vogel, K.P., Varvel, G.E., Klopfenstein, T., Clark, D., Anderson, B. 2005. Can perennial grass pastures be profitable in the great plains?. Center for Grassland Studies Newsletter. Winter 2005 p.3&6, Uni of NE, Lincoln, NE.
A DIRECT COMPARISON OF ECONOMIC RETURNS FOR DRYLAND CORN AND BIG BLUESTEM PASTURE IN THE GREAT PLAINS - (Peer Reviewed Journal)
Mitchell, R., Vogel, K.P., Varvel, G.E., Klopfenstein, T., Clark, D. 2005. A direct comparison of economic returns for dryland corn and big bluestem pasture in the great plains. Rangelands. 27:31-35.
SOIL CARBON CHANGES IN A LONG-TERM CROPPING SYSTEM STUDY - (Abstract Only)
Varvel, G.E. 2004. Soil carbon changes in a long-term cropping system study. Agronomy Abstracts #4160.
SOIL CARBON CHANGES IN A LONG-TERM CROPPING SYSTEM STUDY - (Abstract Only)
Varvel, G.E. 2004. Soil carbon changes in a long-term cropping system study. Agronomy Abstracts # 872941.
ESTIMATION OF POTENTIAL ETHANOL YIELD FROM CORN STOVER PRODUCED USING DIFFERENT CROP MANAGEMENT STRATEGIES - (Abstract Only)
Wilhelm, W.W., Varvel, G.E., Vogel, K.P., Jechura, J.L., Sluiter, A.D., and Thomas, S.R. 2004. Estimation of potential ethanol yield from corn stover produced using different crop management strategies [abstract]. 26th Symposium on Biotechnology for Fuel and Chemicals. Abstract No. 1A-08. 2004.
INTEGRATED ASSESSMENT OF AGROECOSYSTEMS: CASE STUDIES FROM THE GREAT PLAINS AND WESTERN CORN BELT - (Abstract Only)
Liebig, M.A., Varvel, G.E., Tanaka, D.L., Merrill, S.D., Halvorson, A.D. 2004. Integrated assessment of agroecosystems: Case studies from the great plains and western corn belt. Soil and Water Conserv. Society annual meeting. 24-28 July 2004, St. Paul, MN. Abstract
AN ECONOMIC COMPARISON OF LIVESTOCK GRAZING AND CORN PRODUCTION IN EASTERN NEBRASKA - (Abstract Only)
Mitchell, R., Vogel, K.P., Varvel, G.E., Klopfenstein, T.J., Clark, R.T. 2004. An economic comparison of livestock grazing and corn production in eastern nebraska. Society for Range Management Meeting Abstracts. #258.
REDUCTION OF HIGH SOIL TEST PHOSPHORUS BY CROP REMOVAL - (Peer Reviewed Journal)
EGHBALL, B., SHANAHAN, J.F., VARVEL, G.E., GILLEY, J.E. REDUCTION OF HIGH SOIL TEST PHOSPHORUS BY CROP REMOVAL. AGRONOMY JOURNAL 95:1233-1239. 2003.
GREAT PLAINS SOIL QUALITY ASSESSMENT PROJECT: LOCATIONS AND CROPPING SYSTEMS - (Abstract Only)
VARVEL, G.E., RIEDELL, W.E., TANAKA, D.L., VIGIL, M.F., SCHWARTZ, R.C., DEIBERT, E., MCCONKEY, B. 2003. GREAT PLAINS SOIL QUALITY ASSESSMENT PROJECT: LOCATIONS AND CROPPING SYSTEMS. AGRONOMY ABSTRACTS #872941.
CROPPING SYSTEM EFFECTS ON SOIL QUALITY IN THE GREAT PLAINS - (Abstract Only)
Wienhold, B.J., Pikul Jr, J.L., Liebig, M.A., Vigil, M.F., Varvel, G.E., Doran, J.W., Andrews, S.S. 2003. Cropping system effects on soil quality in the Great Plains. Abstract 478851. ASA Abstracts. CDROM
CROPPING SYSTEM EFFECTS ON SOIL QUALITY IN THE GREAT PLAINS: SUMMARY FROM A REGIONAL PROJECT - (Proceedings)
WIENHOLD, B.J., PIKUL JR, J.L., LIEBIG, M.A., VIGIL, M.F., VARVEL, G.E., DORAN, J.W. CROPPING SYSTEM EFFECTS ON SOIL QUALITY IN THE GREAT PLAINS: SUMMARY FROM A REGIONAL PROJECT. Proceedings from Dynamic Cropping Systems: Prinicples, Processes, and Challenges. PP 215-219. 2003.
ASSESSMENT OF CROPPING SYSTEM EFFECTS ON SOIL QUALITY IN THE GREAT PLAINS: INTRODUCTION - (Proceedings)
VARVEL, G.E., RIEDELL, W.E., DEIBERT, E., MCCONKEY, B., TANAKA, D.L., VIGIL, M.F., SCHWARTZ, R.C. ASSESSMENT OF CROPPING SYSTEM EFFECTS ON SOIL QUALITY IN THE GREAT PLAINS: INTRODUCTION. Proceedings from Dynamic Cropping Systems: Prinicples, Processes, and Challenges. pp. 197-204. 2003.
AEPAT: SOFTWARE FOR ASSESSING AGRONOMIC AND ENVIRONMENTAL PERFORMANCE OF MANAGEMENT PRACTICES IN LONG-TERM AGROECOSYSTEM EXPERIMENTS - (Peer Reviewed Journal)
Liebig, M.A., Miller, M.E., Varvel, G.E., Doran, J.W., Hanson, J.D. 2004. AEPAT: Software for assessing agronomic and environmental performance of management practices in long-term agroecosystem experiments. Agronomy Journal. 96:109-115.
SOYBEAN NITROGEN CONTRIBUTION TO CORN AND SORGHUM IN WESTERN CORN BELT ROTATIONS - (Peer Reviewed Journal)
VARVEL, G.E., WILHELM, W.W. 2003. SOYBEAN NITROGEN CONTRIBUTION TO CORN AND SORGHUM IN WESTERN CORN BELT ROTATIONS. AGRONOMY JOURNAL 95:1220-1225.
EFFECTS OF WESTERN CORN BELT CROPPING SYSTEMS ON AGROECOSYSTEM FUNCTIONS - (Peer Reviewed Journal)
Liebig, M.A., Varvel, G.E. 2003. Effects of western corn belt cropping systems on agroecosystem functions. Agronomy Journal. 95(2):316-322.
REDUCTION OF HIGH SOIL TEST PHOSPHORUS BY CROP REMOVAL - (Abstract Only)
EGHBALL, B., SHANAHAN, J.F., VARVEL, G.E., GILLEY, J.E. REDUCTION OF HIGH SOIL TEST PHOSPHORUS BY CROP REMOVAL. AMERICAN SOCIETY OF AGRONOMY ABSTRACTS #140104. 2002.
IRRIGATED CROPPING SYSTEM EFFECTS ON SOIL ORGANIC MATTER VALUES DETERMINED BY WEIGHT-LOSS-ON-IGNITION - (Abstract Only)
VARVEL, G.E., WILHELM, W.W. IRRIGATED CROPPING SYSTEM EFFECTS ON SOIL ORGANIC MATTER VALUES DETERMINED BY WEIGHT-LOSS-ON-IGNITION. AGRONOMY ABSTRACTS #113841. 2002.
CROP SEQUENCE AND N FERTILIZATION EFFECTS ON SOIL PROPERTIES IN THE WESTERN CORN BELT - (Peer Reviewed Journal)
Liebig, M.A., Varvel, G.E., Doran, J.W., Wienhold, B.J. 2002. Crop sequence and n fertilization effects on soil properties in the western corn belt. Soil Science Society of America Journal. 66:596-601.
SOIL ORGANIC MATTER ASSESSMENTS IN A LONG-TERM CROPPING SYSTEM STUDY - (Peer Reviewed Journal)
VARVEL, G.E., LIEBIG, M.A., DORAN, J.W. SOIL ORGANIC MATTER ASSESSMENTS IN A LONG-TERM CROPPING SYSTEM STUDY. COMMUNICATIONS IN SOIL SCIENCE AND PLANT ANALYSIS 33(13&14):2119-2130. 2002.
SOYBEAN N CONTRIBUTION FOR CORN IN THE WESTERN CORN BELT - (Abstract Only)
VARVEL, G.E. SOYBEAN N CONTRIBUTION FOR CORN IN THE WESTERN CORN BELT. AGRONOMY ABSTRACTS #85720. 2001.
SEPARATING THE IMPACTS ON RISK OF CROP DIVERSIFICATION AND ROTATIONS - (Peer Reviewed Journal)
HELMERS, G., YAMOAH, C., VARVEL, G.E. SEPARATING THE IMPACTS ON RISK OF CROP DIVERSIFICATION AND ROTATIONS. AGRONOMY JOURNAL 93:1337-1340. 2001.
NITRATE DISTRIBUTION IN CORN STALKS AT MATURITY - (Abstract Only)
Wilhelm, W.W., Varvel, G.E., Schepers, J.S. 2001. Nitrate distribution in corn stalks at maturity. Agronomy Abstracts #160534.
CORN STALK NITRATE CONCENTRATION PROFILE: IMPLICATIONS FOR THE END OF SEASON STALK NITRATE TEST - (Proceedings)
Wilhelm, W.W., Varvel, G.E., Schepers, J.S. 2001. Corn stalk nitrate concentration profile: implications for the end of season stalk nitrate test. pp. 708-709. Plant Nutrition Colloquium Proceedings.
A SIMPLE PERFORMANCE-BASED INDEX FOR ASSESSING MULTIPLE AGROECOSYSTEM FUNCTIONS. - (Peer Reviewed Journal) - (01-Mar-01)
USE OF REMOTE SENSING IMAGERY TO ESTIMATE CORN GRAIN YIELD - (Peer Reviewed Journal)
Shanahan, J.F., Schepers, J.S., Francis, D.D., Varvel, G.E., Wilhelm, W.W., Tringe, J.S., Schlemmer, M.R. 2001. Use of remote sensing imagery to estimate corn grain yield. Agronomy Journal 93:583-589.
STATUS OF SOIL QUALITY INDICATORS IN WESTERN CORN BELT CROPPING SYSTEMS. - (Abstract Only) - (05-Nov-00)
COMPARISON OF SOIL C ANALYSES BY DRY COMBUSTION AND LOSS ON IGNITION IN A LONG TERM CROP ROTATION STUDY - (Abstract Only)
VARVEL, G.E., DORAN, J.W. COMPARISON OF SOIL C ANALYSES BY DRY COMBUSTION AND LOSS ON IGNITION IN A LONG TERM CROP ROTATION STUDY. AGRONOMY ABSTRACTS p. 363. 2000.
NITROGEN UPTAKE EFFICIENCY IN GRAIN CROPS - (Abstract Only)
Wilhelm, W.W., Varvel, G.E. 2000. Nitrogen uptake efficiency in grain crops. Agronomy Abstracts p. 122.
CROP ROTATION AND NITROGEN EFFECTS ON NORMALIZED GRAIN YIELDS IN A LONG-TERM STUDY - (Peer Reviewed Journal)
VARVEL, G.E. CROP ROTATION AND NITROGEN EFFECTS ON NORMALIZED GRAIN YIELDS IN A LONG-TERM STUDY. AGRONOMY JOURNAL 92:938-941. 2000.
ECONOMIC TRADEOFFS OF CARBON SEQUESTRATION RESULTING FROM ALTERNATIVE CROPPING SYSTEMS - (Proceedings)
HELMERS, G.A., VARVEL, G.E. SELECTED PAPER. ECONOMIC TRADEOFFS OF CARBON SEQUESTRATION RESULTING FROM ALTERNATIVE CROPPING SYSTEMS. AMERICAN AGRICULTURAL ECONOMICS ASSOCIATION MEETING. July-August 2000.
CROP AND ENVIRONMENTAL PERFORMANCE OF MAIZE CROPPING SYSTEMS IN THE WESTERN CORN BELT - (Abstract Only) - (31-Oct-99)
STABILITY OF NORMALIZED GRAIN YIELDS IN A LONG-TERM CROP ROTATION STUDY - (Abstract Only)
VARVEL, G.E. STABILITY OF NORMALIZED GRAIN YIELDS IN A LONG-TERM CROP ROTATION STUDY. AGRONOMY ABSTRACTS, p. 288. 1999.
MIDSEASON STALK BREAKAGE IN CORN AS AFFECTED BY CROP ROTATION, HYBRID, AND NITROGEN FERTILIZER RATE - (Peer Reviewed Journal)
Wilhelm, W.W., Liebig, M.A., Varvel, G.E., Blackmer, T.M. 1999. Midseason stalk breakage in corn as affected by crop rotation, hybrid, and nitrogen fertilizer rate. Agronomy Journal 91:161-165.
VEGETATIVE DEVELOP OF CORN UNDER VARIOUS N MANAGEMENT STRATEGIES - (Abstract Only)
Wilhelm, W.W., Varvel, G.E. 1998. Vegetative develop of corn under various n management strategies. Agronomy Abstracts p. 94.
NITROGEN DEFICIENCY DETECTION USING REFLECTED SHORTWAVE RADIATION FROM IRRIGATED CORN CANOPIES - (Peer Reviewed Journal) - (01-Jan-96)
ANALYSIS OF AERIAL PHOTOGRAPHY FOR NITROGEN STRESS WITHIN CORN FIELDS - (Peer Reviewed Journal) - (15-Dec-95)
LIGHT REFLECTANCE COMPARED WITH OTHER NITROGEN STRESS MEASUREMENTS IN CORN LEAVES - (Peer Reviewed Journal) - (30-Jan-95)
     
Last Modified: 05/25/2013