David Claypool

Department of Plant Sciences

I previously worked with Dr. Andrew Kniss for 15 years in developing sustainable weed management programs in agronomic crops, especially sugarbeet, winter wheat, corn, and dry beans.  We conducted as many as 45 field and greenhouse trials annually.  I handled the logistical aspects of the program, managed data, wrote reports and grant proposals, presented results at conferences, and supervised and trained students as well. 

Prior to working in weed science, I worked in crop physiology management, precision agriculture, cropping systems, soil fertility, and plant breeding.  I also initiated and conducted a project of GPS mapping and development of GIS databases and maps for record-keeping and management of Wyoming agricultural research and extension centers (REC).  This included mapping REC infrastructure and annual research locations, soil grid sampling, apparent soil electrical conductivity mapping, and obtaining aerial imagery through the AEROCam program. 

Before coming to Wyoming, I worked in Ohio, North Dakota, and South Dakota in soil fertility, cropping systems, variety testing, and soil physical characterization.

Professional Certifications and Memberships

• Certified Professional Agronomist, Soil Scientist, and Crop Adviser

• Commercial Pesticide Applicator (WY)

Selected Publications and Reports 

Chen, J., J.F. Keith, and D.A. Claypool. 2025. Growth and Physiological Responses of Three Culturally Significant Native Edible Berry Species to Controlled-release Fertilizer in Greenhouse Conditions. HortScience 60:729–737. 
https://journals.ashs.org/hortsci/view/journals/hortsci/60/5/article-p729.xml 

Ballenger, J.G., A.T Adjesiwor, D.A. Claypool, and A.R. Kniss.  2024. Relative contribution of shade avoidance and resource competition to early-season sugar beet yield loss due to weeds.  Weed Sci. 72:159-163.  DOI: https//.org/10.1017/wsc.2023.79

Kniss, A., D. Claypool, L. Lorent, and T. Schambow.  2015.  Reaching for the sun.  Reflections.  University of Wyoming College of Agriculture.  p. 21-23.  https://www.uwyo.edu/uwexpstn/publications/reflections/reflections-2015.pdf

Kniss, A.R., D.A. Claypool, R. Rapp, J. Unverzagt, L. Lorent, and C. Coburn.  2013.  Weed Research Report– 2012.  Department of Plant Sciences, University of Wyoming, Laramie.  150 pages.

Walsh, M.J., R.W. Groose, A.K. Obour, D.A. Claypool, R.H. Delaney, and J.M. Krall. 2013. Seed persistence in soil of five medic cultivars in southeastern Wyoming. Crop Science 53:1-5. 

Kniss, A.R., D.A. Claypool, R. Rapp, E. Omondi, N. Lawrence, J. Unverzagt, L. Lorent, and C. Coburn.  2012.  Weed Research Report– 2011.  Department of Plant Sciences, University of Wyoming, Laramie.  95 pages.

Sivanpillai, R., D.A. Claypool, and R. Siloju. 2012. Relating AEROCam-derived NDVI to apparent soil electrical conductivity (EC_a) for corn fields in Wyoming, USA.  Remote Sensing Letters 3(1):49-56.  https://dx.doi.org/10.1080/01431161.2010.533296

Zhang, X., H. Kim, C. Streeter, D.A. Claypool, R. Sivanpillai, and S. Seelan. 2011. Near real-time high-resolution airborne camera, AEROCam, for Precision Agriculture. GeoCarto International 26(7):537–551.  http://www.tandfonline.com/doi/abs/10.1080/10106049.2011.600463

Claypool, D.A.  2010.  Progress Report: Development of GPS maps, GIS databases, soils baseline data, and aerial imagery for the James C. Hageman Sustainable Agriculture Research and Extension Center.  Submitted to: the University of Wyoming Agricultural Experiment Station and Department of Plant Sciences. 7 Apr.  36 pages.

Kniss, A.R., D.A. Claypool, C. Odero, E. Omondi, N. Lawrence, J. Unverzagt, and C. Brandon.  2010.  Weed Research Report – 2009.  Department of Plant Sciences, University of Wyoming, Laramie.  100 pages.

Kniss, A.R., D.A. Claypool, C. Odero, E. Omondi, J. Unverzagt, and C. Brandon.  2009.  Weed Research Report – 2008.  Department of Plant Sciences, University of Wyoming, Laramie.  55 pages.

Kniss, A.R., D.A. Claypool, E. Omondi, J. Unverzagt, and C. Brandon.  2009.  2008 Sugarbeet Weed Control Research.  Department of Plant Sciences, University of Wyoming, Laramie.  23 pages.

Farahani, H.J., D.A. Claypool, R.P. Belden, L.C. Munn, and R.A. Flynn.  2008.  Soil EC_a mapping helps establish research plots at a new research and extension center.  In: B.J. Allred et al., editors, Handbook of Agricultural Geophysics. CRC Press, New York, NY.  p. 281-286.

Sivanpillai, R., D.A. Claypool, M. Ellison, and G.M. Sbatella.  2008.  High resolution, no-cost AEROCam data promotes undergraduate remote sensing research in Wyoming.  Photogrammetric Engineering & Remote Sensing 74(4):385-389.

Fleming, M.R, D.A. Claypool, S.D. Miller, and L.J. Held.  2006.  Precision Application of Herbicide for Control of Skeletonleaf Bursage in Winter Wheat.  Journal of the American Society of Farm Managers and Rural Appraisers. 69 (1):131-135.  https://higherlogicdownload.s3.amazonaws.com/ASFMRA/aeb240ec-5d8f-447f-80ff-3c90f13db621/UploadedImages/Journal/256_Held.pdf

Claypool, D., H. Farahani, K. Belden, and L. Munn.  2004.  Modern tools help establish a new agricultural research and extension center.  Reflections.  University of Wyoming College of Agriculture.  p. 55-56.  https://www.uwyo.edu/uwexpstn/publications/reflections/reflections-2004-web.pdf

Claypool, D., S. Miller, L. Held, and R. Delaney.  2003.  Crop sprayer offers applications for precision agriculture research, teaching, and extension.  Reflections.  University of Wyoming College of Agriculture.  p. 32-33.  https://www.uwyo.edu/uwexpstn/publications/reflections/reflections-2003-web.pdf

Haag, A.A., L.J. Held, J.M. Krall, R.H. Delaney, S.D. Miller, and D. Claypool.  2003.  Replacing summer fallow with a summer grazed legume crop in rotation with wheat or wheat-sunflower-millet.  Journal of the American Society of Farm Managers and Rural Appraisers. 66 (1):26-36.

Krall, J., R. Delaney, A. Haag, L. Held, and D. Claypool.  2002.  Austrian winter peas for dryland grazing with lambs.  Cooperative Extension Service B-1128.  University of Wyoming, Laramie, WY.  https://www.wyoextension.org/agpubs/pubs/B1128.pdf

Claypool, D.A., D.G. Hopkins, and J.L. Richardson.  1990.  Soil Morphology and Stratigraphy on an Erosional Footslope: Dickinson Research Center in Western North Dakota.  Soil Survey Horizons.  31: 9-13.