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Fig. 4. Residual soil NO3 concentration vs. depth for each N treatment after harvest in 2002 through 2005. The N treatments for corn were H = 199 kg ha–1, M = 138 kg ha–1, L = 69 kg ha–1, and R = 69 kg ha–1 of N applied at V1 to V3 with another 69 kg ha–1 N side-dressed at midseason (V16). No N fertilizer was applied to soybean. Corn was harvested in even years, soybean in odd years. Horizontal bars, where present, represent least significant difference where an F test was significant (
= 0.05).
