水稻秧苗的氮素效应研究

本文对秧田施肥进行了研究，结果表明，处于ｎ叶片的秧苗缺氮时，则处于ｎ＋１、ｎ＋２叶片的秧苗也处于缺氮状态，尤以ｎ＋１叶片的秧苗最为严重；在秧苗处于二龄末期，三龄初期与六龄期（接近移栽期前）适当供应氮素是非常必要的。

Studies on effects of nitrogen on rice seedling

Rational application of fertilizer to seed-bed is of great importance in cultivation practice throughout growthstages of rice. The experimental results showed that if rice seedlings with n leaves is in state of nitrogen deficiency,theseedlings with n+1,n+2 leaves must be short of nitrogen,especially with n+1 leaves. Therefore,it is necessary to applynitrogen to seedlings at the end of the second leaf stage,the beginning of the third stage and the sixth leaf stage.