As to the nitrogenous accumulation of above-ground in the two years, T2 is the highest, and T3 is the lowest.

• 在2003年晚稻不同生长阶段，硝酸还原酶活性以早稻不施氮、晚稻施氮处理(T4)最高，以早晚两季均不施氮的处理(T3)最低。