Contact Us


Plant, Soil and Entomological Sciences

Agricultural Sciences Bldg.
Room 242
Phone: (208) 885-6274
Fax: (208) 885-7760

Mailing Address:
Plant, Soil and Entomological Sciences
University of Idaho
875 Perimeter Drive MS 2339
Moscow, ID 83844-2339

Glenn Shewmaker

Glenn Shewmaker

Office: KLC 104
Phone: (208) 423-6678
Email: gshew@uidaho.edu
Mailing Address: Kimberly Research & Extension Center
3793 N 3600 E
Kimberly, ID 83341-5076

College of Agricultural and Life Sciences
Department of Plant, Soil and Entomological Sciences
Associate Professor

  • Research/Focus Areas
    • Forage Specialist
  • Selected Publications
    • Casler, M.D., Y.A. Papadopolous, S. Bittman, R.D. Mathison, D.H. Min, J.G. Robins, J.H. Cherney, S.N. Acharya, D.P. Belesky, S.R. Bowley, B.E. Coulman, R. Drapeau, N.J. Ehlke, M.H. Hall, R.H. Leep, R. Michaud, J. Rowsell, G.E. Shewmaker, C.D. Teutsch, and W.K. Coblentz.  2013.   Submitted to Crop Science.
    • Brink, Geoffrey, M. Hall, G. Shewmaker, D. Undersander, N. Martin, and R. Walgenbach. 2010. Changes in alfalfa yield and nutritive value within individual harvest periods, Agronomy Journal 102:1274-1206
    • Jensen, K.S., C. Cheyney, J. Hawkins, W. Gray, G. Shewmaker, S. Williams, T. Griggs, J. Gerrish. 2009. Lost Rivers Grazing Academy: Building Sustainability in Livestock Production. Journal of Extension 47(1). (Online) http://www.joe.org/joe/2009february/iw4.php
    • Shewmaker, G.E., D.A. Johnson, and H.F. Mayland.  2008.  Mg and K Effects on Cation Uptake and Dry Matter Accumulation in Tall Fescue (Festuca arundinacea). Plant Soil  302:283–295. doi:10.1007/s11104-007-9482-3
    • Shewmaker, G.E., H.F. Mayland, C.A. Roberts, P.A. Harrison, N.J. Chatterton, and D.A. Sleper.  2006. Daily Carbohydrate Accumulations in Tall Fescue Accessions. Grass and Forage Science 61:413-421.
    • Entry, J.A., R.E. Sojka, and G.E. Shewmaker.  2004.  Irrigation Increases Inorganic Carbon in Agricultural  Soils.  Environmental Management 33: Supplement 1, S309–S317.
    • Entry, J.A., J.J. Fuhrmann, R.E. Sojka, and G.E. Shewmaker.  2004.  Influence of Irrigated Agriculture on Soil Carbon and Microbial Community Structure.  Environmental Management 33: Supplement 1, S363–S373.
    • Hall, M.H., J.A. Jennings, and G.E. Shewmaker. 2004. Alfalfa establishment guide. Forage and Grazinglands (Online) doi:10.1094/FG-2004-0723-01-MG
    • Shewmaker, G.E., D.A. Johnson, H.F. Mayland, S.A. Martin, and S.B. Hansen. 2004. Elemental uptake in relation to root characteristics of tall fescue. Communications in Soil Science and Plant Analysis. 35:1339-1355.
    • Entry, J.A., R.E. Sojka, and G.E. Shewmaker. 2002. Management of irrigated agriculture to increase organic carbon storage in soils. Soil Science Society of America Journal. 66:1957-1964.
  • Research Projects
    • Forage management and utilization
    • Alfalfa and grass forage quality


    • Provides forage management and utilization extension program leadership statewide
    • Provides support for intensive pasture grazing systems and the environmental effects of grazing, as well as management, to improve forage quality, production, and utilization
    • Conducts alfalfa variety trials
  • Awards and Honors
    • 2011 Don Hale Hall of Fame Award presented by the Idaho Hay and Forage Association
    • 2010 Merit Award from American Forage and Grassland Council
    • 2010 American Society for Agronomy Educational Materials Award for Pasture and Grazing Management in the Northwest PNW 614.  Presented by division A04—Extension Education—of the American Society for Agronomy at the ASA Annual Meeting in Long Beach, CA.
    • 2010 Western Extension Agricultural Experiment Station Directors 2010 Awards of Excellence, Regional Qualifying Program
    • 2010 Excellence in Extension Award by University of Idaho:  for writing Pasture and Grazing Management in the Northwest PNW 614; this was a team award and included $1000, which was used for scholarships for professional development to the Lost Rivers Grazing Academy.  Team members from Idaho include from the University of Idaho: Charles Cheyney, Glenn Shewmaker, Shannon Williams, Sarah Baker, Scott Jensen, Brian McLain, Howard Neibling, Christine Falen, Oliver Neher, Tianna Fife, John Hall, Jim Church, Rikki Wilson, Kelly Crane, J. Benton Glaze, C. Wilson Gray, and Diane Noel; from USDA; Dan Ogle and Loren St. John; and from Producer/Consultant; Jim Gerrish, and Laura Hooper.
    • 2007 Excellence in Extension Award by National Association of County Agents: The Lost Rivers Grazing Academy Team won the national award in Search for Excellence in Livestock Production from the NACAA.  Team members include Scott Jensen, Jim Hawkins, Chad Cheyney, Shannon Williams, Wilson Gray, Glenn Shewmaker, Jim Gerrish (Grazing Consultant), and Tom Griggs (Utah State). 
    • 2005 Outstanding Publication (1-12 pages) for Alfalfa: the high quality hay for horses awarded by A-04 division of American Society for Agronomy
    • 2005 Outstanding Publication (over 12 pages) for Idaho Forage Handbook awarded by A-04 division of American Society for Agronomy
    • 2003 Best Soil & Water Management & Conservation Division (S-6) Paper in volume 66 of the Soil Science Society of America Journal titled Management of Irrigated Agriculture to Increase Organic Carbon Storage in Soils, November 2003