Karl Guillard

Professor Emeritus of Agronomy

Dr. Guillard has retired from the University and is no longer accepting graduate students or Postdoctoral researchers.


  • Ph.D., University of Connecticut, 1986
  • M.S., University of Connecticut, 1983
  • B.S., Pennsylvania State University, 1979

Previously Taught Courses

  • TURF 1100, Turfgrass Management (formerly SAPL 024/PLSC 124)
  • TURF 3200, Turfgrass Physiology and Ecology (formerly PLSC 224)
  • PLSC 3820, Ecology & Control of Weeds (formerly PLSC 257)
  • TURF 3720, Golf Course Design (Turfgrass and Construction Sections, formerly PLSC 284)

Research Interests

My research involves the development and evaluation of best management practices for turfgrass systems with emphasis on soil and water quality. Current studies include the evaluation of soil nitrogen tests as a guide for turf fertilizer recommendations, determining the relationship between fall verdure tissue nitrate concentrations and turf spring quality, and predicting turf quality with reflectance meters.

Honors & Awards

2006 Faculty Excellence Award in Teaching at the Undergraduate level, University of Connecticut Alumni Association

2002 National Association of State Universities and Land-Grant Colleges, USDA Food and Agriculture Sciences Excellence in Teaching Award

2002 National Association of Colleges and Teachers of Agriculture Teaching Award of Merit

2001-2002 University of Connecticut Teaching Fellow Award.

Northeast Branch American Society of Agronomy/Soil Science Society of America 2001 Teaching Award.

1999 Editors’ Citation for Excellence in Manuscript Review, Journal of Environmental Quality

1997 Donald M. Kinsman Award for Excellence in CANR/RHSA Undergraduate Teaching by Junior Faculty, College of Agriculture and Natural Resources, University of Connecticut.

1992 New York Farmer’s Award for Outstanding Achievement in Agriculture.

Selected to participate in the Outstanding Young Scientist Session of the 1984 American Forage and Grassland Conference

Select Publications

Bary, T.J., K. Guillard, and S.S. Mangiafico. 2009. Relationships between soil nitrate desorbed from anion-exchange membranes, canopy reflectance and nitrate leaching losses from cool-season lawn turf. Int. Turfgrass Soc. Res. J. 11:933-947.http://digitalcommons.uconn.edu/plsc_articles/25/

Kopp, K.L., and K. Guillard. 2009. Quantifying turfgrass-avaliable N from returned clippings using anion-exchange membranes. Int. Turfgrass Soc. Res. J. 11:41-54.http://digitalcommons.uconn.edu/plsc_articles/26/

Mangiafico, S.S., and K. Guillard. 2007. Cool-season lawn turfgrass color and growth calibrated to leaf nitrogen. Crop. Sci. 47:1217–1224.http://digitalcommons.uconn.edu/plsc_articles/23/

Mangiafico, S.S., and K. Guillard. 2007. Nitrate leaching from Kentucky bluegrass soil columns predicted with anion exchange membranes. Soil Sci. Soc. Am. J. 71:219-224. http://digitalcommons.uconn.edu/plsc_articles/24/

Mangiafico, S.S., and K. Guillard. 2006. Anion exchange membrane soil nitrate predicts turfgrass color and yield. Crop. Sci. 46:569–577.

Mangiafico, S.S., and K. Guillard. 2006. Fall fertilization effects on nitrate leaching and turfgrass color and growth. J. Environ. Qual. 35:163–171.

Goodall, S.A., K. Guillard, W.M. Dest, and K. Demars. 2005. Ball response and traction of skinned infields amended with calcined clay at varying soil moisture contents. Int. Turfgrass Soc. Res. J. 10:1085–1093. http://digitalcommons.uconn.edu/plsc_articles/5/

Dest, W.M., K. Guillard, J.S. Ebdon. 2005. The effect of reinforcement materials on wear tolerance, playing quality and physical properties in a silt loam and sand rootzone matrix. Int. Turfgrass Soc. Res. J. 10:1049–1059.http://digitalcommons.uconn.edu/plsc_articles/9/

Kopp, K.L., and K. Guillard. 2005. Clipping contributions to nitrate leaching in turfgrass under variable irrigation and N rates. Int. Turfgrass Soc. Res. J. 10:80–85.http://digitalcommons.uconn.edu/plsc_articles/12/

Mangiafico, S.S., and K. Guillard. 2005. Relationships among turfgrass reflectance meter measurements, chlorophyll, and soil nitrate desorbed from anion exchange membranes. Crop Sci. 45:259–265. http://digitalcommons.uconn.edu/plsc_articles/10/

Fitzpatrick, R.J.M, and K. Guillard. 2004. Kentucky bluegrass response to potassium and nitrogen fertilization. Crop Sci. 44:1721–1728.

Kopp, K. and K. Guillard. 2004. Decomposition and nitrogen release rates of turfgrass clippings. Proceedings of the 4th International Crop Science Congress. 26 September -1 October, 2004. Brisbane, Queensland, Australia. http://digitalcommons.uconn.edu/plsc_confs/3/

Guillard, K., and K.L. Kopp. 2004. Nitrogen fertilizer form and associated nitrate leaching from cool-season lawn turf. J. Environ. Qual. 33:1822–1827.http://digitalcommons.uconn.edu/plsc_articles/11/

Guillard, K., and W.M. Dest. 2003. Extractable soil phosphorus concentrations and creeping bentgrass response on sand greens. Crop Sci. 43:272-281.

Kopp, K.L., and K. Guillard. 2002. Clipping management and N fertilization of turfgrass: Growth, N utilization, and quality. Crop Sci. 42:1225-1231.

Kopp, K.L., and K. Guillard. 2002. Relationship of turfgrass growth and quality to soil nitrate desorbed from anion exchange membranes. Crop Sci. 42:1232-1240. http://digitalcommons.uconn.edu/plsc_articles/2/

Dest, W.M., and K. Guillard. 2001. Bentgrass response to K fertilization and K release rates from eight sand rootzone sources used in putting green construction. p. 375-381. In K Carey (ed.) Proc. 9th International Turfgrass Research Conf., Toronto, Canada. 15-21 July. ITS Guelph, Ontario, Canada.http://digitalcommons.uconn.edu/plsc_articles/13/

Dest, W.M., and K. Guillard. 1987. Nitrogen and phosphorus nutritional influences on bentgrass-annual bluegrass community composition. J. Amer. Soc. Hort. Sci. 112:769–773


Suffolk County Turf Presentation. Fall 2009

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