The results indicated that seven proportion of NO3--N and NH4+-N reduced fresh nodule weight and inhibited activity of nodule nitrogenase,but increased the total nitrogen content of leaves.

• 结果表明:7种配比的NO3--N与NH4+-N均降低根瘤鲜重，抑制根瘤固氮酶活性，但提高叶片全氮含量。