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Management Practice Effects on Phosphorus Losses in Runoff in Corn Production Systems

^a Dep. of Soil Science, 1525 Observatory Dr., Univ. of Wisconsin, Madison, WI 53706-1299
^b USDA-ARS, U.S. Dairy Forage Research Center, 1925 Linden Drive West, Madison, WI 53706

View larger version (25K): [in a new window]   Fig. 1. Effect of inorganic P fertilizer (IPF) rate on dissolved reactive P (DRP) concentration and load in runoff (histograms) and soil test P values (0- to 2-cm depth), July 1998. Where P > F is 0.05, mean values followed by the same letter are not significantly different at the 0.05 probability level.

View larger version (28K): [in a new window]   Fig. 2. Effect of biosolids and dairy manure histories on dissolved reactive P (DRP) concentration and load in runoff (histograms) and soil test P (line) values (0- to 2-cm depth), October 1998. Where P > F is 0.05, mean values followed by the same letter are not significantly different at the 0.05 probability level.

View larger version (22K): [in a new window]   Fig. 3. Effect of spring-applied dairy manure and tillage on dissolved reactive P (DRP) concentration and load in runoff, May 1999. Initial soil test P value was 13 mg kg-1 (0- to 2-cm depth). CP = chisel plow; ST = shallow till; NT = no till. Where P > F is 0.05, mean values followed by the same letter are not significantly different at the 0.05 probability level; NS, not significant.

View larger version (26K): [in a new window]   Fig. 4. Effect of spring-applied dairy manure and tillage on dissolved reactive P (DRP) concentration and load in runoff (histograms) and soil test P (line) values (0- to 2-cm depth), September 1999. CP = chisel plow; ST = shallow till; NT = no till. Where P > F is 0.05, mean values followed by the same letter are not significantly different at the 0.05 probability level; NS, not significant.

View larger version (29K): [in a new window]   Fig. 5. Effect of spring-applied dairy manure and tillage on total P (TP) concentration and load in runoff, September 1999. CP = chisel plow; ST = shallow till; NT = no till. Where P > F is 0.05, mean values followed by the same letter are not significantly different at the 0.05 probability level.