Dr. Gary A. Lehrsch --- Soil Scientist ---

USDA-ARS-NWISRL
3793 N.  3600 E.
Kimberly, Idaho  83341

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Search the Research Interpretive Summaries (TEKTRAN).  TEKTRAN summaries on the Internet are "snapshots in time" -- published or soon-to-be-published articles -- of recent research results from the Agricultural Research Service (ARS), the U.S. Department of Agriculture's chief scientific research agency.

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Vita

Gary is a soil scientist, with specialized training and expertise in soil physics. He conducts and publishes personal and team research. Gary serves as lead scientist for some research projects and as a collaborator on others. He reviews research papers and proposals and serves as an Associate Editor on the editorial board of the journal Arid Land Research and Management. He earned a Bachelor's and two Master's degrees (one in Environmental Pollution Control and one in Agronomy) from Penn State University in the late 1970's and a Ph.D. in Soil Physics from Mississippi State University in 1985. Throughout the past 20 years, Gary has been employed by the U.S. Dept. of Agriculture at Kimberly as a soil scientist studying soil structure, water movement, and irrigation management.

Research Interests

In his current personal and team research, Gary seeks 1) to increase sugarbeet seedling emergence by minimizing soil crusting and improving soil physical and hydraulic properties, 2) to utilize agricultural by-products, such as whey, manure, and compost, and irrigation management to increase crop production efficiency and improve soil properties, and 3) to characterize and control preferential transport of nutrients, such as N & P, and other solutes through soil, thereby protecting groundwater quality. Historically, much of Gary’s research has focused on the processes and products responsible for soil aggregate formation, stabilization, and destruction in cultivated irrigated soils.

Gary anticipates soon beginning the study of 1) N & P release from soil aggregates fractured by freezing and thawing processes, 2) soil organic carbon effects on soil physical & hydraulic properties, 3) runoff water quality from fields that have received compost and manure, and 4) water movement and chemical transport through surfactant-treated wettable and non-wettable soils. Gary may also study the effects of organic farming production practices on soil structure and N management.

Active Projects

1. Polymer use to minimize crust formation and increase sugarbeet seedling emergence (Collaborators: D.C. Kincaid & R.D. Lentz). Synthetic polymers or polyacrylamide (PAM) applied to soil surfaces may stabilize surface soil under raindrop or sprinkler droplet impact, thereby reducing crusting and increasing seedling emergence. In both lab and field studies, some polymers increased sugarbeet seedling emergence from 10 to 44% more than controls by increasing surface soil aggregate stability and decreasing penetration resistance. The cost-effective application of an appropriate chemical anticrustant to crust-prone soils may increase sugarbeet emergence.
2. Freeze-thaw effects on aggregate stability. Climatic processes such as freezing and thawing cause aggregate stability to vary with time. In lab studies, the aggregate stability of 3 of 4 soils increased with the first 2 or 3 freeze-thaw cycles, but decreased with 4 or more. By better understanding these processes, we can develop management practices to maximize their beneficial impacts on soil structure as well as minimize their adverse impacts on soil structure.
3. Macropore flow and hydraulic conductivity. Macropores, soil pores with diameters greater than 1 mm, are frequently cracks in the soil surface, old root channels, or earthworm burrows. Where present in soils, macropores transmit from 10 to 10,000 times as much water as do all the smaller pores. Preferential flow through soil macropores is a potential pathway through which nitrates, agrichemicals, or waste products such as cheese whey could easily and quickly move through soil profiles to contaminate groundwater. In these field and laboratory projects, I am measuring macropore flow by i) conducting a series of instantaneous profile tests, and ii) using two devices: a ponded infiltrometer and a tension infiltrometer.

Education

• B.S., 1976, Environmental Resource Management, Pennsylvania State Univ., Univ. Park, PA.
• M.E.P.C., 1979, Environmental Pollution Control, Pennsylvania State Univ., Univ. Park, PA.
• M.S., 1981, Agronomy, Pennsylvania State Univ., Univ. Park, PA.
• Ph.D., 1985, Soil Physics, Mississippi State Univ., Miss. State, MS.

Major Subjects Studied
 

In undergraduate work:  Environmental Resource Mgmt.

In graduate work:  Soil Physics, Environmental Pollution Control

Minor Subjects Studied
 

In undergraduate work:  Engineering, Biology, Chemistry

In graduate work:  Engineering, Hydrology, Mathematics, Statistics

  EXPERIENCE:

PROFESSIONAL:

USDA-ARS; Northwest Irrigation and Soils Research Lab., 3793 N. 3600 E., Kimberly, ID  83341.  Oct., 1987 - present; GS-11 to GS-13	Research on soil aggregate stability, soil erodibility, nitrate contamination of groundwater, and infiltration occurring under furrow irrigation	Soil Scientist responsible for project leadership and employee supervision
USDA-ARS; GS-11; National Sedimentation Lab., P.O. Box 1157, Oxford, MS (Sept., 1986 - Sept., 1987)	Research on soil interrill erodibility, Developing a data base of erosion rates and sediment properties	Soil Scientist (post-doctoral appointment) with leadership responsibilities of independently conceiving, conducting, and reporting research
Mississippi State Univ., Mississippi State, MS (Sept., 1980 - Aug., 1986)	Research in soil physics, Overseeing field research, Supervising employees, Analyzing and interpreting the results of field studies	Research Associate with significant responsibility
Pennsylvania State Univ., University Park, PA (Mar., 1980 - Aug., 1980)	Research in soil fertility, Designing a field experiment, Applying fertilizer, Taking plant and soil samples	Graduate Research Assistant (3/4 time) with major responsibility and limited supervision

 

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Update 9-23/1997

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Studied processes responsible for soil aggregate formation and stabilization; monitored changes in aggregate stability occurring with time and as a consequence of climatic differences, freeze-thaw cycles, rainfall energy, and tillage; developed techniques to minimize nitrate leaching through soil profiles while maximizing plant uptake of NO₃-N; measured soil surface roughness and other soil physical properties as affected by rainfall, cultivation, and soybean canopy development; operated a 9.4 x 10⁴ kJ hr^-1-tractor, Gidding's hydraulically driven soil sampler, hand-operated recording-type soil penetrometer, Meyer and Harmon oscillating nozzle-type rainfall simulator, and an automated, non-contact microrelief meter; evaluated the effects of planting date, winter wheat presence, soybean row spacing, crop rotations, and tillage on plant extractable water in wheat-soybean double-cropping systems; developed a procedure to estimate plant extractable water in soil profiles; developed models to predict infiltration into reclaimed fly ash disposal areas; determined a soil erodibility factor for fly ash; studied techniques successfully used for coal ash stabilization; measured erosion from rainfall; determined single-storm rainfall factors; applied soil water balance theories to estimate infiltration into and percolation through a fly ash disposal area; measured NO₃-N movement through a soil profile.

TEACHING:

USDA
 

USDA-ARS Northwest Irrigation and Soils Research Lab. Staff, 1990, Statistical Analyses using SAS

Undergraduate Teaching
 

College of Southern Idaho, 1990-1996, Introduction to Computers, DOS (Beginning and Advanced)

College of Southern Idaho, 1991, Introduction to Statistics

Of Individuals
 

Mississippi State University, 1981-1986, Statistical Analyses, Personal Computer Operations, Soil Physics Laboratory Techniques, Field Research Procedures

USDA-ARS, Oxford, MS, 1987, Soil Physical and Chemical Laboratory Analysis Procedures

USDA-ARS, Kimberly, ID, 1988-present, Soil Physics Laboratory Techniques and Field Research Procedures

  ADDITIONAL INFORMATION:

HONORS AND AWARDS:
 

-Permitted as a junior in high school to attend Penn. State Univ. as an adjunct student while completing requirements for a diploma, 1971-1972;

-Recipient of a certificate and cash award for placing second in the Am. Soc. Agron. Graduate Student Paper Competition, Southern Branch, 1985;

-Elected to Gamma Sigma Delta Agricultural Honor Society, 1985;

-Elected to Sigma Xi Scientific Research Honor Society, 1988;

-Listed in Outstanding Young Men of America, 1989;

-Listed in American Men and Women of Science, 17th ed., 1989-1990, and 19th ed., 1995-1996;

-Listed in Who's Who in Science and Engineering, 1st ed., 1992-1993, 2nd ed., 1994-1995, and 3rd ed., 1996-1997;

-Listed in Who's Who in the World, 12th ed., 1994-1995;

-Listed in Men of Achievement, 16th ed., 1994-1995, and 17th ed., 1996-1997;

-Recognized as an Outstanding Reviewer for the Soil and Water Division of the American Society of Agricultural Engineers, 1994.

  SPECIAL INVITATIONS:  

Invited to present the paper "Estimating soil interrill erodibility" at the Water Erosion Prediction Project (WEPP) Core Team Meeting and Workshop, Columbia, MO. 1988.

Invited to present the paper "Temporal variation in aggregate stability" at the Water Erosion Prediction Project (WEPP) Core Team Meeting and Workshop, Columbia, MO. 1988.

Invited to present the paper "Temporal changes in wet aggregate stability" at the International Summer Meeting of the American Society of Agricultural Engineers, Albuquerque, NM. 1991.

Invited to present the paper "Furrow erosion and aggregate stability changes in southern Idaho" at the National Irrigation-Induced Erosion and Water Quality Conference, Boise, ID. 1992.

Invited to present the paper "Effects of soil strength on furrow erosion variation within two growing seasons" at the National Irrigation-Induced Erosion and Water Quality Conference, Boise, ID. 1992.

Invited to write (with Dr. T. M. Zobeck) a chapter entitled "Sample collection, handling, and preparation for aggregate stability and size distribution analyses" for a book edited by Dr. Bruce T. Warden, and to be published by Marcel Dekker, Inc. 1993.

Invited to write (with Dr. C. W. Robbins) a chapter entitled "Cheese whey as a soil conditioner" for the book "Handbook of Soil Conditioners," edited by Drs. A. Wallace and R. E. Terry, and published by Marcel Dekker, Inc. 1996.

Invited by Dr. Malcolm Sumner, Regents' Professor of Soil Science, Univ. of Georgia, to serve as a member of a nationwide Soil Science Delegation of the People to People Citizen Ambassador Program visit to the Republic of South Africa. 1996.

Invited to participate in a regional roundtable of Pennsylvania Governor Tom Ridge's 21^st Century Environment Commission, with goals to identify 1) Pennsylvania's environmental priorities for the next century, and 2) means to achieve those goals. 1997.

Invited to present the paper "Aggregate stability research at Kimberly, ID: Past, present, and future" to the faculty, staff, and students of the Department of Plants, Soils, and Biometeorology, Utah State Univ., Logan. 1998.

 
MEMBERSHIP IN HONOR SOCIETIES AND IN PROFESSIONAL ORGANIZATIONS:
 

Gamma Sigma Delta

Sigma Xi

American Society of Agronomy

American Society for Surface Mining and Reclamation

Soil Science Society of America

Soil and Water Conservation Society

Western Society of Soil Science

MEMBERSHIP IN OTHER ORGANIZATIONS:
 

Graduate Faculty:
 
University of Idaho, Affiliate Professor of Soil Science, Department of Plant, Soil and Entomological Sciences, 1988-present
Other:
 
College of Southern Idaho (Instructor, Main Campus, Twin Falls, ID, 1990-1996; Instructor, Mini-Cassia Campus, Burley, ID, 1991)

Christian and Missionary Alliance Church (Teacher, Twin Falls, ID, 1988-1989, 1998; Elder, 1989-present)

Southern Baptist Church, (Teacher, State College, PA, 1979-1980; Teacher, Starkville, MS, 1981-1986; Teacher, Oxford, MS, 1986-1987)

Microcomputer User's Group, Mississippi State University, 1985-1987.

Mississippi Chapter, Soil and Water Conservation Society, Member, 1987.

Pacific Northwest Frozen Soil Task Force, 1988-1990.
 
 

COMMITTEE ASSIGNMENTS:
 
Water Resources Committee, Mississippi Chapter, Soil and Water Conservation Society, Member, 1987.

Editorial Committee, Intl. Symp. on Frozen Soil Impacts on Agricultural, Range, and Forest Lands, Pacific Northwest Frozen Soil Task Force, Member, 1988-1990.

Northwest Irrigation and Soils Res. Lab., Kimberly, ID:
 

Library Committee, Chairman, 1990-present.

Safety Committee, Member, 1990-present.

Computer Equipment and Service Committee, Member, 1990-present.

FOREIGN LANGUAGES:   French
  PUBLICATIONS:  
Refereed Publications

Lehrsch, G.A., F.D. Whisler, and M.J.M. Römkens.  1987.  Soil surface roughness as influenced by selected soil physical properties.  Soil Till. Res. 10:197-212.

Lehrsch, G.A., F.D. Whisler, and M.J.M. Römkens.  1988a.  Spatial variation of parameters describing soil surface roughness.  Soil Sci. Soc. Am. J. 52:311-319.

Lehrsch, G.A., F.D. Whisler, and M.J.M. Römkens.  1988b.  Selection of a parameter describing soil surface roughness.  Soil Sci. Soc. Am. J. 52:1439-1445.

Lehrsch, G.A., and D.E. Baker.  1989.  Fly ash erodibility.  J. Soil Water Conserv. 44:624-627.

Lehrsch, G.A., R.E. Sojka, D.L. Carter, and P.M. Jolley.  1991.  Freezing effects on aggregate stability affected by texture, mineralogy, and organic matter.  Soil Sci. Soc. Am. J. 55:1401-1406.

Robbins, C.W., and G.A. Lehrsch.  1992.  Effects of acidic cottage cheese whey on chemical and physical properties of a sodic soil.  Arid Soil Res. Rehab. 6:127-134.

Lehrsch, G.A., and P.M. Jolley.  1992.  Temporal changes in wet aggregate stability.  Trans. Am. Soc. Agric. Eng. 35:493-498.

Lehrsch, G.A., R.E. Sojka, and P.M. Jolley.  1993.  Freezing effects on aggregate stability of soils amended with lime and gypsum.  pp. 115-127.  In  J.W.A. Poesen & M.A. Nearing (eds.) Soil Surface Sealing and Crusting.  Catena Supplement 24, ISBN 3-923381-33-6, Catena Verlag, Germany.

Lehrsch, G.A., C.W. Robbins, and C.L. Hansen.  1994.  Cottage cheese (acid) whey effects on sodic soil aggregate stability.  Arid Soil Res. Rehab. 8:19-31.

Lehrsch, G.A., F.D. Whisler, and N.W. Buehring.  1994.  Cropping system influences on extractable water for mono- and double-cropped soybean.  Agric. Water Mgmt. 26:13-25.

Brown, M.J., D.L. Carter, G.A. Lehrsch, and R.E. Sojka.  1995.  Seasonal trends in furrow irrigation erosion in southern Idaho.  Soil Technol. 8:119-126.

Lehrsch, G.A.  1995.  Soil - Temporal variation in aggregate stability.  pp. 311-313.  In  1996 McGraw-Hill Yearbook of Science and Technology.  McGraw-Hill, Inc., New York.

Lehrsch, G.A., and M.J. Brown.  1995.  Furrow erosion and aggregate stability variation in a Portneuf silt loam.  Soil Technol. 7:327-341.

Lehrsch, G.A., and C.W. Robbins.  1996.  Cheese whey effects on surface soil hydraulic properties.  Soil Use Mgmt. 12:205-208.

Lehrsch, G.A.  1998.  Freeze-thaw cycles increase near-surface aggregate stability.  Soil Sci. 163:63-70.
 
Manuscripts Submitted, in Review or Revision, or in Preparation
 
Lehrsch, G.A., R.E. Sojka, and D.T. Westermann.  N placement and furrow irrigation management effects on corn yield and N uptake.  For submission to Soil Sci. Soc. Am. J.  In Preparation.

Lehrsch, G.A., R.E. Sojka, and D.T. Westermann.  Soil nitrate-N changes under furrow irrigation during two growing seasons.  For submission to Soil Sci. Soc. Am. J.  In Preparation.

Sojka, R.E., W.J. Busscher, and G.A. Lehrsch.  Soil strength, bulk density, and soil water content relationships on several soils.  For submission to Soil Sci.  In Preparation.

Lehrsch, G.A., and R.E. Sojka.  Spatial variability of soil nitrate-N.  For submission to Soil Sci. Soc. Am. J.  In Preparation.

Lehrsch, G.A., R.E. Sojka, and D.T. Westermann.  Nitrate leaching through soil profiles under surface irrigation.  For submission to J. Environ. Qual.  In Preparation.

Lehrsch, G.A., and D.C. Kincaid.  Sprinkler droplet energy effects on soil physical and hydraulic properties.  For submission to Trans. ASAE.  In Preparation.

Lehrsch, G.A., R.D. Lentz, and D.C. Kincaid.  Polymer effects on sugarbeet emergence, soil penetration resistance, and aggregate stability.  For submission to J. Sugar Beet Res.  In Preparation.
 
Other Major Articles

Lehrsch, G. A.  1976.  Sewage effluent: site considerations for spray disposal.  pp. 94-104.  In R. L. Cunningham (ed.)  Soils and environmental quality.  Agron. Series 45, Dept. of Agron., The Pennsylvania State Univ., Univ. Park, PA.

Lehrsch, G. A.  1979.  Estimating infiltration into reclaimed land.  pp. 169-174.  In  S. B. Carpenter (ed.)  Proc. Symp. on Surface Mining Hydrology, Sedimentology, and Reclamation, Lexington, KY.  4-7 Dec 1979.  Office of Engineering Services, Univ. of Kentucky, Lexington.

Lehrsch, G. A., D. E. Baker, and D. D. Fritton.  1981.  Infiltration into a reclaimed fly ash disposal site.  pp. 639-661.  In  Proc. of Fourth Annual Madison Conf. of Applied Research and Practice on Municipal and Industrial Waste, Madison, WI.  28-30 Sep 1981.  Univ. of Wisconsin-Extension, Madison, WI.

Lehrsch, G.A., D.C. Kincaid, and R.D. Lentz.  1996.  Polyacrylamide sprayed on soil surfaces can stabilize soil aggregates.   pp. 533-538.  In  Erosion control technology - bringing it home.  Proc. of Conf. 27, Seattle, WA.  27 Feb. - 1 Mar. 1996.  Int. Erosion Control Assoc., Steamboat Springs, CO.

Lehrsch, G.A., D.C. Kincaid, and R.D. Lentz.  1996.  PAM Spray effects on sugarbeet emergence.  pp. 115-118.  In  R.E. Sojka and R.D. Lentz (eds.)  Managing irrigation-induced erosion and infiltration with polyacrylamide.  Univ. of Idaho Misc. Publ. 101-96.  USDA-ARS, Kimberly, ID.

Lehrsch, G.A., and T.M. Zobeck.  Sample collection, handling, and preparation for aggregate stability and size distribution analyses.  In  B. T. Warden (ed.)  Soil Sample Handling and Preparation for Chemical and Physical Analysis.  Marcel Dekker, Inc., New York.  (Accepted by B.T. Warden, Editor, on Dec. 20, 1994).

Robbins, C.W., and G.A. Lehrsch.  1998.  Cheese whey as a soil conditioner.  pp. 167-186.  In  A. Wallace and R.E. Terry (eds.)  Handbook of Soil Conditioners: Substances that enhance the physical properties of soil.  Marcel Dekker, Inc., New York.

Wright, J.L., D.T. Westermann, and G.A. Lehrsch.  Studying nitrate-N leaching with a bromide tracer in an irrigated silt loam soil.  In  Proc. U.S. Committee on Irrigation and Drainage Conference on Best Management Practices for Irrigated Agriculture and the Environment.  USCID, Denver, CO.  (Accepted by Larry Stephens, Exec. Vice Pres., on Aug. 19, 1997).
 
Other Publications

Lehrsch, G. A.  1979.  Controlling water pollution from fly ash disposal areas.  Master of Environmental Pollution Control Paper.  The Pennsylvania State Univ., Univ. Park, PA.

Buehring, N. W., F. D. Whisler, G. Lehrsch, and W. C. Caldwell.  1981.  Fuel consumption for various tillage operations on a Leeper silty clay soil.  pp. 9.  In  Abstracts of Tech. Papers, South. Assoc. Agric. Scient., Southern Branch of Am. Soc. of Agron., Madison, WI. 1-4 Feb 1981. Atlanta, GA.

Whisler, F. D., N. W. Buehring, G. A. Lehrsch, J. K. Young, and R. W. Henderson.  1981.  Water usage in minimum tillage soybean production systems.  pp. 5.  In  Abstracts of Tech. Papers, South. Assoc. Agric. Scient., Southern Branch of Am. Soc. of Agron., Madison, WI. 1-4 Feb 1981. Atlanta, GA.

Buehring, N. W., B. C. Caldwell, F. D. Whisler, and G. Lehrsch.  1982.  Grain sorghum and soybean yield responses in a rotation system.  pp. 12.  In  Abstracts of Tech. Papers, South. Assoc. Agric. Scient., Southern Branch of Am. Soc. of Agron., Madison, WI. 7-10 Feb 1982. Orlando, FL.

Whisler, F. D., G. A. Lehrsch, and N. W. Buehring.  1982.  Apparent water usage with different weed control measures in double-cropping soybean systems.  pp. 9.  In  Abstracts of Tech. Papers, South. Assoc. Agric. Scient., Southern Branch of Am. Soc. of Agron., Madison, WI. 7-10 Feb 1982. Orlando, FL.

Acock, B., F. D. Whisler, A. Trent, G. A. Lehrsch, and H. F. Hodges.  1982.  Validation of the GLYCIM soil temperature subroutine.  pp. 13 (Abstract).    In   Program and Abstracts: Workshop on Crop Simulation. Biological System Simulation Group. 16-18 Mar 1982. Auburn, AL.

Trent, A., F. D. Whisler, H. F. Hodges, and G. A. Lehrsch.  1982.  Validation of a micro-computer based irrigation scheduling program.  pp. 21 (Abstract).  In  Program and Abstracts: Workshop on Crop Simulation. Biological System Simulation Group. 16-18 Mar 1982. Auburn, AL.

Buehring, N. W., F. D. Whisler, C. Hagedorn, and G. Lehrsch.  1984.  No-till soybean response to winter annual legumes.  pp. 10.  In  Abstracts of Tech. Papers, South. Assoc. of Agric. Scient., Southern Branch of Am. Soc. Agron., Madison, WI. 5-8 Feb 1984. Nashville, TN.

Lehrsch, G.A.  1989.   Kudzu.   Reclam. Newsletter 12(1):1.

Robbins, C. W., and G. A. Lehrsch.  1991.  Cottage cheese (acid) whey effects on chemical and physical properties of a sodic soil.  pp. 424.  In  Agronomy abstracts. Am. Soc. of Agron., Madison, WI. Western Soc. Soil Sci. 23-27 Jun 1991. Logan, UT.

Sojka, R. E., G. A. Lehrsch, and D. T. Westermann.  1991.  Dry-side banding and furrow rotation to reduce nitrate leaching in furrow irrigated corn.  pp. 341-342.  In  Agronomy abstracts. Am. Soc. of Agron., Madison, WI. 27 Oct-1 Nov 1991. Denver, CO.

Meek, B. D., D. T. Westermann, and G. A. Lehrsch.  1993.  Potential for denitrification in irrigated silt loam soils of southern Idaho.  pp. 415.  In  Agronomy abstracts. ASA, Madison, WI.

Wright, J. L., D. T. Westermann, and G. A. Lehrsch.  1994.  Downward movement of nitrate-N in irrigated soils of southern Idaho.  pp. 324-325.  In  Agronomy abstracts. ASA, Madison, WI.

Wright, J.L., D.T. Westermann, and G.A. Lehrsch.  1998.  Nitrate-N leaching studied with a bromide tracer in an irrigated silt loam soil.  pp. 18.  In  Abstracts: Eighth Annual Nonpoint Source Water Quality Monitoring Results Workshop, Boise, ID. 6-8 Jan 1998. Idaho Dept. of Health and Welfare, Div. of Environ. Quality, Boise, ID.
 
PRESENTATIONS AT SCIENTIFIC MEETINGS:

Lehrsch, G. A., and D. E. Baker. 1980. Coal ash stabilization. Abstract No. 12 IN Poster Session Abstracts. XIII AUA-ANL Biology Symp., Argonne, IL. 21-22 Apr 1980. Argonne National Laboratory, Argonne, IL.

Lehrsch, G. A., D. E. Baker, and D. D. Fritton. 1980. Infiltration into fly ash disposal areas. p. 15 (Abstract). IN Invited Papers and Abstracts of Contributed Papers. Northeastern Branch of Am. Soc. of Agron., Madison, WI. 29 Jun-2 Jul 1980. Univ. Park, PA.

Lehrsch, G. A., F. D. Whisler, N. W. Buehring, and N. Edwards. 1981. A profile water content analysis procedure to detect differences in water usage in minimum tillage soybean production systems. Agron. Abstracts 73:215 (Abstract). Am. Soc.of Agron., Madison, WI. 29 Nov-4 Dec 1981. Atlanta, GA.

Lehrsch, G. A., J. K. Young, and F. D. Whisler. 1982. Penetration resistance of Mississippi soils as affected by bulk density and moisture content. Agron. Abstracts 74:163 (Abstract). Am. Soc. of Agron., Madison, WI. 28 Nov-3 Dec 1982. Anaheim, CA.

Lehrsch, G. A., N. W. Buehring, and F. D. Whisler. 1984. Fuel consumption for soybean tillage systems on a Leeper silty clay. Abstracts of Tech. Papers 11:12 (Abstract). South. Assoc. of Agric. Scient., Southern Branch of Am. Soc. of Agron., Madison, WI. 5-8 Feb 1984. Nashville, TN.

Lehrsch, G. A., F. D. Whisler, and N. W. Buehring. 1984. Plant extractable water for soybeans and grain sorghum as affected by crop rotation and tillage. Agron. Abstracts 76:251 (Abstract). Am. Soc. of Agron., Madison, WI. 25-30 Nov 1984. Las Vegas, NV.

Lehrsch, G. A., F. D. Whisler, and N. W. Buehring. 1985. Influence of planting date, winter wheat, and soybean row spacing on plant extractable water for double-cropped soybeans. Abstracts of Tech. Papers 12:6 (Abstract). South. Assoc. of Agric. Scient., Southern Branch of Am. Soc.of Agron., Madison, WI. 3-6 Feb 1985. Biloxi, MS.

Lehrsch, G. A., M. J. M. Romkens, and F. D. Whisler. 1985. Spatial variation of parameters describing soil surface roughness. Agron. Abstracts 77:208 (Abstract). Am. Soc. of Agron., Madison, WI. 1-6 Dec 1985. Chicago, IL.

Lehrsch, G. A., F. D. Whisler, M. J. M. Romkens, and N. W. Buehring. 1986. Effect of simulated rainfall on soil surface roughness under a developing soybean canopy. Agron. Abstracts 78:246 (Abstract). Am. Soc. of Agron., Madison, WI. 30 Nov-5 Dec 1986. New Orleans, LA.

Lehrsch, G. A., and L. D. Meyer. 1987. Estimating soil interrill erodibility. Agron. Abstracts 79:242 (Abstract). Am. Soc. of Agron., Madison, WI. 29 Nov-4 Dec 1987. Atlanta, GA.

Lehrsch, G. A., M. J. Brown, and P. M. Jolley. 1988. Furrow erosion as affected by aggregate stability changes in a Portneuf silt loam. Agron. Abstracts 80:280 (Abstract). Am. Soc. of Agron., Madison, WI. 27 Nov-2 Dec 1988. Anaheim, CA.

Lehrsch, G. A., and P. M. Jolley. 1989. Temporal variation in the aggregate stability of eight western soils. p. 17. IN Western Society of Soil Science and Western Society of Crop Science Abstracts. Am. Soc. of Agron., Madison, WI.

Lehrsch, G. A., and P. M. Jolley. 1989. Temporal variation in the aggregate stability of 14 U.S. soils. p. 284. IN Agron. Abstracts. Am. Soc. of Agron., Madison, WI. 15-20 Oct 1989. Las Vegas, NV.

Lehrsch, G. A., R. E. Sojka, D. L. Carter, and P. M. Jolley. 1990. Effects of freezing on aggregate stability of soils differing in texture, mineralogy, and organic matter content. p. 41 (Abstract). IN Proc. of Pacific Div., Am. Assoc. for Adv. of Sci., Vol. 9, Part 1, Program with Abstracts. AAAS, San Francisco, CA.

Lehrsch, G. A., and D. E. Baker. 1990. Fly ash erodibility. (Poster) Annual Meeting of the Soil and Water Conservation Society, Salt Lake City, UT, July-August, 1990.

Lehrsch, G. A., R. E. Sojka, D. L. Carter, and P. M. Jolley. 1990. Freezing effects on aggregate stability of soils differing in texture, mineralogy, and organic matter content. p. 319. IN Agron. Abstracts. Am. Soc. of Agron., Madison, WI. 21-26 Oct 1990. San Antonio, TX.

Lehrsch, G. A., R. E. Sojka, and P. M. Jolley. 1991. Freezing effects on aggregate stability of soils amended with lime and gypsum. Agron. Abstracts 83:335. Am. Soc. of Agron., Madison, WI. 27 Oct- 1 Nov 1991. Denver, CO.

Lehrsch, G. A., R. E. Sojka, and D. T. Westermann. 1992. Nitrate movement in a Portneuf silt loam under furrow irrigation. p. 14. IN Abstracts: Second Annual Nonpoint Source Water Quality Monitoring Results Workshop. Div. of Environmental Quality, Id. Dept. of Health and Welfare, Boise. 14-16 Jan 1992. Boise, ID.

Lehrsch, G. A., M. J. Brown, and P. M. Jolley. 1992. Growing season changes in furrow erosion and aggregate stability in a Portneuf silt loam. p. 437, 446. IN Agron. Abstracts. Am. Soc. of Agron., Madison, WI. 21-25 Jun 1992. Santa Barbara, CA.

Lehrsch, G. A., and P. M. Jolley. 1992. Temporal changes in aggregate stability. p. 57-58. In D. S. Chanasyk (ed.) Proceedings of the 2nd International Symposium on Agricultural Techniques in Cold Regions, Edmonton, Alberta, Canada. 4-7 Aug 1992. Dept. of Soil Science, Univ. of Alberta, Edmonton, Alberta, Canada.

Lehrsch, G. A., M. J. Brown, and P. M. Jolley. 1992. Furrow erosion and aggregate stability changes in a Portneuf silt loam (abstract). Can. J. Soil Sci. 72:321-322. Abstracts of Tech. Papers, Annual Meeting of Canadian Land Reclamation Assoc. and Can. Soc. of Soil Sci., Edmonton, Alberta, Canada. 8-15 Aug 1992.

Lehrsch, G. A., and D. E. Baker. 1992. Fly ash erodibility. Can. J. Soil Sci. 72:322. Abstracts of Tech. Papers, Annual Meeting of Canadian Land Reclamation Assoc. and Can. Soc. of Soil Sci., Edmonton, Alberta, Canada. 8-15 Aug 1992.

Lehrsch, G. A., and C. W. Robbins. 1992. Cottage cheese (acid) whey effects on sodic soil aggregate stability. p. 330. In Agron. Abstracts. Am. Soc. of Agron., Madison, WI. 1-6 Nov 1992. Minneapolis, MN.

Lehrsch, G. A., R. E. Sojka, and D. T. Westermann. 1992. Nitrate movement in a Portneuf silt loam under furrow irrigation. p. 14. In Abstracts: Second Annual Nonpoint Source Water Quality Monitoring Results Workshop, Boise, ID. 14-16 Jan 1992. Div. Environ. Qual., Idaho Dept. Health and Welfare, Boise.

Lehrsch, G. A., M. J. Brown, and P. M. Jolley. 1992. Growing season changes in furrow erosion and aggregate stability in a Portneuf silt loam. p. 437, 446. In Agronomy abstracts. ASA, Madison, WI.

Lehrsch, G. A., and M. J. Brown. 1992. Furrow erosion and aggregate stability changes in southern Idaho. p. 39-40. In Proc. Nat. Irrigation-Induced Erosion and Water Quality Conf., Boise, ID. 31 Aug-2 Sep 1992.

Lehrsch, G. A., R. E. Sojka, and D. T. Westermann. 1993. Fertilizer placement effects on root development and nitrate leaching under furrow-irrigated field corn. p. 19. In Abstracts: Third Annual Nonpoint Source Water Quality Monitoring Results Workshop, Boise, ID. 5-7 Jan 1993. Div. Environ. Qual., Idaho Dept. Health and Welfare, Boise.

Lehrsch, G. A., and C. W. Robbins. 1993. Cottage cheese (acid) whey effects on the aggregate stability of sodic soil. p. 885. In B. A. Zamora and R. E. Connolly (eds.) The challenge of integrating diverse perspectives in reclamation. Proc. 10th Annual Nat. Meet. of Am. Soc. Surface Mining and Reclamation, Spokane, WA. 16-19 May 1993. Vol. 2. ASSMR, Princeton, WV.

Lehrsch, G. A., F. D. Whisler, and N. W. Buehring. 1993. Cropping system influences on extractable water for mono- and double-cropped soybean. p. 320. In Agronomy abstracts. ASA, Madison, WI.

Lehrsch, G. A., and C. W. Robbins. 1994. Cheese whey as an amendment to disturbed lands: Effects on soil hydraulic properties. p. 15. In Abstracts: Fourth Annual Nonpoint Source Water Quality Monitoring Results Workshop, Boise, ID. 4-6 Jan 1994. Div. Environ. Qual., Idaho Dept. Health and Welfare, Boise.

Lehrsch, G. A., and C. W. Robbins. 1994. Cheese whey effects on soil hydraulic properties. p. 36. In Agronomy abstracts. ASA, Madison, WI.

Lehrsch, G. A., and D. T. Westermann. 1995. Controlling nitrate leaching under furrow irrigation. p. 26. In Abstracts: Fifth Annual Nonpoint Source Water Quality Monitoring Results Workshop, Boise, ID. 3-5 Jan 1995. Div. Environ. Qual., Idaho Dept. Health and Welfare, Boise.

Lehrsch, G.A., R.E. Sojka, and D.T. Westermann. 1995. Urea placement and furrow irrigation effects on soil NO₃-N under corn. p. 461. In Agronomy abstracts. ASA, Madison, WI.

Lehrsch, G.A., R.E. Sojka, and D.T. Westermann. 1995. N placement and furrow irrigation effects on soil nitrate-N under maize. p. 291. In Agronomy abstracts. ASA, Madison, WI.

Lehrsch, G.A., R.E. Sojka, and D.T. Westermann. 1996. Effects of N placement and furrow irrigation on soil nitrate-N under corn. p. 26. In Abstracts: Sixth Annual Nonpoint Source Water Quality Monitoring Results Workshop, Boise, ID. 9-11 Jan 1996. Idaho Dept. of Health and Welfare, Div. of Environ. Quality, Boise, ID.

Lehrsch, G.A., D.C. Kincaid, and R.D. Lentz. 1996. Organic polymer effects on soil penetration resistance, aggregate stability, and sugarbeet emergence. p. 284. In Agronomy abstracts. ASA, Madison, WI.

Lehrsch, G.A. 1997. Freeze-thaw cycles can increase near-surface aggregate stability. p. 264. In Agronomy abstracts. ASA, Madison, WI.

Lehrsch, G.A., and C.W. Robbins. 1998. Cheese whey utilization to improve soil physical properties under furrow irrigation. p. 23. In Abstracts: Eighth Annual Nonpoint Source Water Quality Monitoring Results Workshop, Boise, ID. 6-8 Jan 1998. Idaho Dept. of Health and Welfare, Div. of Environ. Quality, Boise, ID.
 

REFERENCES:   Dr. D.T. Westermann Laboratory Director/Research Leader Northwest Irrigation and Soils Research Laboratory USDA-Agricultural Research Service 3793 N. 3600 E. Kimberly, ID  83341-5076 (208) 423-6524     Dr. M.J.M. Römkens Soil Physicist/Agricultural Engineer USDA-Agricultural Research Service National Sedimentation Laboratory P.O. Box 1157 Oxford, MS  38655 (601) 232-2927  

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