氮肥水平对不同基因型水稻品种农学利用率的影响

在5个施肥水平下,探讨了6个品种氮肥的农学利用率、稻谷产量以及米质的差异。研究表明,随着施氮量的增加,产量升高。不同施肥水平下,对氮肥的农学利用率不同,75、150kg/hm2施氮水平下较高;随着施氮量的增加,氮肥的农学利用率下降。因此,降低施肥量可以提高氮肥的农学利用率。不同品种在不同的氮肥水平下表现也不相同:协优57在75kg/hm2施肥水平下的农学利用率最高,达14.6kg/kg;氮肥农学利用率高的品种也需在适宜的施肥水平下才能体现。试验表明:不同的产量目标下,宜选择不同的品种。而无论在何产量目标下,以选择协优9019风险最小,因为它的平均氮肥农学利用率较高。多产稻和汕优63是较耐低肥的品种。从改善米质来讲,150kg/hm2的施氮量较为有利。

Effects of Nitrogen-fertilization on the Agronomic Use Efficiency of the Different Rice Varieties

Research on the difference of the agronomic use efficiency (AEN) of N-fertilizer, grain yield and the rice quality was conducted throught the experiment in six varieties under five levels of N-fertilizer. Results showed that the grain yield was improved with the increasing amount of the N-fertilization increasing. Under the different levels of N-fertilizer, the AEN were difference. The AEN was decreasing with the increasing amount of the N-fertilization . But, there were different results in different varieties under the different levels of N-fertilizer. The AEN of hybrid rice combination-Xieyou 57 was the highest under the level of 75 kg N-fertilizer. The experimental result indicated also that the defferent varieties were planted for the certain yield tanget, however, there was lest risk in hybrid rice combination- Xieyou 9019,because its average AEN was the highest. Other varieties:Duochandao and the Shanyou63, were the varieties that could endure the lower level of N-fertilizer. The amount of 150 Kg N-fertilizer,was beneficial to the rice quality .