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Communication at the NABS Annual meeting, Keystone, 2000
(238) SIMULATED EFFECTS OF AGRICULTURAL MANAGEMENT STRATEGIES ON WATER
QUANTITY AND QUALITY IN STREAMS OF DIFFERING GEOLOGY.
J.D. Schomberg1, C. Richards2, L.B. Johnson1, and G. Host1. 1Center for Water and Environment, Natural Resources Research institute, University of Minnesota, Duluth, MN 55811-1442, 2Minnesota Sea Grant, University of Minnesota, Duluth, MN 55812
Using SWAT, the soil and water assessment tool, we simulated the long-term effects of altering tillage methods, fertilizer application, and other agricultural management parameters on water, sediment, and agricultural chemicals in 72 midwestern streams. The model was calibrated with USGS discharge records for water quantity and grab samples for water quality. Within a subset of Minnesota watersheds, sites with a loess geology exported 47% less organic Nitrogen and 23.3% less organic Phosphorus with the conversion from typical fertilization and spring-fall tillage to no-till, low-fertilization agriculture, while organic N and P yields were reduced by 30% and 22%, respectively, in sites with a morainal geology. The differing sensitivities of geologic types to management activities can be attributed to topography, soil types, and the relationships between geology and land use/land cover.
Presented at 8:30 AM on Thursday, June 1, 2000 in Landscape Perspectives I
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