Fig. 3. Soil surface (0–0.2 m) NO-3–N concentration under free drainage (FD) and subirrigation (SI) practices in (a) 1996, (b) 1997, and (c) 1998. Vertical bars represent standard error of the mean (n = 3).
Fig. 3. Soil surface (0–0.2 m) NO-3–N concentration under free drainage (FD) and subirrigation (SI) practices in (a) 1996, (b) 1997, and (c) 1998. Vertical bars represent standard error of the mean (n = 3).