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通过对１９９１～１９９３两年不同品种和不同施氮处理硝酸还原酶活性（ＮＲＡ）的测定，对小麦生长发育中ＮＲＡ变化动态及其与穗粒重、千粒重的动态关系进行了研究。结果表明，小麦各生育时期的叶片ＮＲＡ在开花期为最大，开花前呈上升趋势，开花之后随籽粒灌浆而逐渐下降，穗部（籽粒和颖片）ＮＲＡ在开花后逐渐上升，开花后１５～２１ｄ达到最大，之后又逐渐下降；叶片、籽粒ＮＲＡ以及ＮＲＡ总量与穗粒、千粒重均呈正相关。
Through the determination of nitrate reductase (NRA) activity of different varieties and different nitrogen treatments from 1991 to 1993, the dynamic changes of NRA during wheat growth and development and its relationship with grain weight and grain weight were studied. The results showed that the NRA of the leaves at each growth stage was the largest at flowering stage and then increased before flowering, then decreased with grain filling after flowering. The NRA of ears (grains and glumes) increased gradually after flowering, Reached the maximum at 21d and then decreased gradually. The total amount of NRA and NRA in leaves, kernels and grain weight were positively correlated with grain weight and 1000-grain weight.