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Rate of Fall-Applied Liquid Swine Manure

Effects on Runoff Transport of Sediment and Phosphorus

P. D. Gessela, N. C. Hansenb,*, J. F. Moncriefc and M. A. Schmittc

a Utah Department of Environmental Quality, Division of Water Quality, P.O. Box 144870, Salt Lake City, UT 84114-4870
b University of Minnesota, WCROC, 46352 State Highway 329, Morris, MN 56267
c University of Minnesota, Department of Soil, Water, and Climate, 1991 Upper Buford Circle, St. Paul, MN 55108



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  		Fig. 1. Cumulative daily precipitation for each year of the study period (1999–2001) compared with the 30-yr average daily cumulative precipitation for Morris, Minnesota. Arrows mark the occurrence of runoff from snowmelt (S) or rainfall (R).

 


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  		Fig. 2. The effect of manure application rate on average annual (A) runoff, (B) total solids (TS) loss, (C) total phosphorus (TP) loss, and (D) dissolved molybdate-reactive phosphorus (DP) loss from 1999–2001. Bars are split to indicate the contribution of spring and summer seasons to the annual totals. Bars with the same letters are not significantly different (P < 0.10) when comparing across manure application rates for spring, summer, and annual segments of each bar. Manure was applied annually in the fall based on the P recommendation from an initial soil test (1X) for a corn–soybean rotation.

 




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