Timothy A. Kettler

Tim Kettler

Timothy A. Kettler

Assistant Professor of Practice

B.S., Physical Science Education, University of Nebraska-Lincoln, 1986

M.S., Soil and Water Science (Agronomy), University of Nebraska-Lincoln, 1998

Area of Focus

Soil Science

Research Interests

  • Assessment of teaching method and student learning in teacher-centered, student-centered, and computer-delivered courses.
  • The Assessment of Soil Quality and Health, and development of simple soil test methodologies useful to producers and lay people.

Major Project Activities

  • Coordinator for Nebraska State FFA, 'Agronomic Resources' Career Development Event, held the first week of April, annually.
  • Creation of a series of on-line, interactive learning modules to be utilized in the field of Soil Science Distance Education.

Extension Interests

Participated in creation of the USDA Soil Quality Test Kit. This kit is useful for on-site soil quality analyses and currently is in use all over the world.

Courses Taught


  • Mamo, M., T.A. Kettler, and D. Husmann. 2005. Learning Style responses to an on-line Soil Erosion Lesson. J. Nat. Resour. Life Sci. Educ. 34:44-48.
  • Mamo, M., T.A. Kettler, D. Husmann, and D. McCallister. 2004. Assessment of interactive computer modules and student learning in introductory soil science. NACTA J. 48: 47-52.
  • Kettler, T.A., M. Mamo, D. Husmann, and D. McCallister. 2002. Assessment of an interactive computer module and student learning in introductory soil science. In 2002 Agronomy Abstracts. ASA Madison, WI.
  • Kettler, T.A., J.W. Doran, and T.L. Gilbert. 2001. A simplified method for soil particle size determination to accompany soil quality analyses. Soil Sci. Soc. Am. J. 65:000-000. (May-June 2001)
  • Gajda, A.M., J.W. Doran, T.A. Kettler, B.J. Wienhold, J.L. Pikul, Jr., and C.A. Cambardella. 2001. Soil quality evaluations of alternative and conventional management systems in the Great Plains. p. 381-400. In: R. Lal, J.M. Kimble, R.F. Follett and B.A. Stewart (eds.), Assessment Methods for Soil Carbon. Lewis Publishers, Boca Raton, FL.
  • Cambardella, C.A., A.M. Gajda, J.W. Doran, B.J. Wienhold, and T.A. Kettler. 2001. Estimation of particulate and total organic matter by weight loss-on-ignition. p. 349-359. In: R. Lal, J.M. Kimble, R.F. Follett and B.A. Stewart (eds.), Assessment Methods for Soil Carbon. Lewis Publishers, Boca Raton, FL.
  • Kettler, T.A., J.W. Doran, D.J. Lyon, W.L. Powers, and W.W. Stroup. 2000. Soil Quality Assessment After Weed Control Tillage in a No-Till Wheat-Fallow Cropping System. Soil Sci. Soc. Am. J. 64:339-346.
  • Stamatiadis, S., J.W. Doran, and T.A. Kettler. 1999. Field and laboratory evaluation of soil quality changes resulting from injection of liquid sewage sludge. App. Soil Ecol. 12:263-272.
  • Kettler, T.A. 1998. Soil quality as influenced by intermittent plowing in conservation tillage wheat-fallow systems. M.S. thesis. Univ. of Nebraska, Lincoln, NE 68583.
  • Kesavalou, A., J.W. Doran, W.L. Powers, T.A. Kettler, and J.H. Qian. 1996. Bromide and 15N tracers of nitrate leaching under irrigated corn in central Nebraska. J. Environ. Qual. 25:1008-1014.