Chl content and NR activity of flag leaf had been kept relatively high from frowing to 18 days after anthesis in irrigation treatments (W1 and W2) and had higher transportion ratio of nitrogen.

• 在开花至花后18d内，灌水（W1、W2）各处理的旗叶叶绿素含量与硝酸还原酶活性始终维持在较高水平，且其氮素转运率明显高于不灌水处理（W0）。