The results of 15N tracing showed that the fertilizer-N uptake in rice plant and grain of two varieties increased with the advance of growth stage.

示踪结果显示，两个品种水稻植株和籽粒吸收肥料氮，都随着生育期的推移而逐渐增加。

The distribution direction of fertilizer-N applied at autumn coincided well with the growth rhythm, and could stimulate the tree of poor growth vigor to absorb more fertilizer-N.

以秋施肥料氮的分配与植株生长节奏最吻合，并能刺激生长势弱的植株吸收利用肥料氮。

The effect of applying N-fertilizer or not in wheat on soil fertility and grain yield and fertilizer-N use efficiency (FNUE) of rice in the wheat-rice cropping system were studied.

通过对前茬作物小麦设置施用氮肥与不施用氮肥处理研究它对土壤肥力及后茬作物水稻产量和氮肥利用率的影响。