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.

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