Fig. 5. Soil surface (0–0.2 m) NO-3–N concentrations under 120 kg N ha-1 (N120) and 200 kg N ha-1 (N200) rates in (a) 1996, (b) 1997, and (c) 1998 growing seasons. Vertical bars represent standard error of the mean (n = 3).
Fig. 5. Soil surface (0–0.2 m) NO-3–N concentrations under 120 kg N ha-1 (N120) and 200 kg N ha-1 (N200) rates in (a) 1996, (b) 1997, and (c) 1998 growing seasons. Vertical bars represent standard error of the mean (n = 3).