The increase of nitrogen amount applied could improve the activity of enzyme related to starch synthesis at the middle and late filling stage so as to increase the filling rate of starch.
增加施氮量能够提高灌浆中后期淀粉合成有关酶的活性，提高淀粉的积累速率。
The biological effect of protectively applied nitrogen on nodulation N-fixing activity, nitrogen forms in Xyloid liquid, and amount of assimilated nitrogen in soybean were studied.
从大豆结瘤、固氮活性、木质部溶质氮形态以及植株同化氮量论证了保护性施氮的生物学效应。
The applied amount of nitrogen had a significant effect on grain yield.
施氮量对杂交稻的产量形成和氮肥利用的影响十分明显。
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