Willi Horwath
Soil Fertility and Crop Production
Department: Land, Air and Water Resources
Location: 247 Hoagland Hall
Telephone: (530) 754-6029
Fax: (530) 752-1552
E-mail: wrhorwath@ucdavis.edu
Years with the Project:Since 1996
Education: Bachelor of Science, Southern Illinois University
Ph.D., Michigan State University
General Research Interest Statement:
Stable isotope studies, soil organic matter dynamics, soil
fertility, sustainable agriculture, water quality, plant-microbe
interactions, soil microbial biomass, denitrification, residue
decomposition, root turnover.
Research Interest Pertaining to
SAFS Project :
I am interested in how cropping system practices affect soil
organic matter maintenance and carbon sequestration. In particular,
I plan to examine the influence of conventional and organic
management practices on the structure and function of soil
organic matter and how this relates to the concept of sustainable
nutrient cycling.
Selected Publications:
Horwath, W. R., E. A. Paul and K. S. Pregitzer. 1996. Calibration
of chloroform fumigation procedures for soil biomass estimation
using microscopic counting and 14C-labeled substrates. Canadian
Journal of Soil Science: In press.
Paul, E. A., W. R. Horwath, D. Harris, R. Follett, S.W.
Leavitt, B. A. Kimball and K. S. Pregitzer. 1996. Establishing
the pool sizes and fluxes in CO2 emissions from soil organic
matter turnover. B. A. Stewart, ed. Advances in Soil Science:
In press
Horwath, W. R. and L. F. Elliott. 1996. Microbial C and
N dynamics in rye grass during mesophilic and thermophilic
incubations. Biol and Fert Soils. 22:1-9.
Horwath, W. R. and L. F. Elliott. 1996. Ryegrass straw component
decomposition during mesophilic and thermophilic incubations.
Biol and Fert Soils. 21:227-232.
Churchill, D. B., W. R. Horwath, and L. F. Elliott. 1996.
Low-input on-farm composting of high C to N ratio crop residues.
American Journal of Alternative Agriculture. 7: 7-9.
Horwath, W. R., L. F. Elliott, D. B. Churchill, and H. S.
Minshew. 1995 Mechanisms controlling composting of high C
to N ratio Grass Straw. Compost Science and Utilization. 3:
22-30.
Churchill, D. B., W. R. Horwath, and L. F. Elliott. 1995.
Perennial Rye Grass response to application of composted grass
seed straw. Journal Applied Seed Production. 13:16-21.
Horwath, W. R., E. A. Paul and K. S. Pregitzer. 1994. 14C
partitioning in tree-soil systems. Tree Physiology. 14: 1163-1176.
Horwath, W. R., E. A. Paul and K. S. Pregitzer. 1992. Injection
of labeled nitrogen into trees to study nitrogen cycling in
soil. Soil Sci. Soc. Am. 56:316-319.
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