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Fig. 3. Nitrogen management treatment effects on groundwater NO3–N concentrations sampled biweekly from March 2001 to July 2003 at (a) 0.9- to 1.8-m, (b) 1.8- to 2.7-m and (c) 2.7- to 3.7-m depths. 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. Different letters above bars indicates significant differences among the estimated treatment means at the 0.05 probability level. For cases where 0.05 < p < 0.10, the actual p value of the comparison is shown. The reference line is at 10 mg NO3–N L–1.
