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Fig. 4. Corn grain yield response curves to sidedress injection rate of liquid swine manure (LSM) from 1999 to 2002. Yields are adjusted for presidedress topsoil NO₃ concentration. Large symbols represent the rate required for 95% maximum yield for plot- (colored symbol) and field- (gray symbol) scale data sets. Solid and dashed lines represent quadratic fits for plot- and field-scale yields, respectively.