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Fig. 2. Comparisons of N applied, grain yield or aboveground biomass (forage), harvest N ratio, and surplus N for three N management treatments in a wheat–soybean–corn rotation from 2001 to 2003. Mean values are shown above the columns. Bars indicate +1 SE. Different letters above the bars indicate significant differences among estimated treatment means at the 0.05 probability level. RYE = uniform Realistic Yield Expectation N management; FA = remote sensing-informed, uniform, field-average N management; SS = remote sensing-informed, site-specific, variable-rate N management.
