甘蔗种植体系中施肥对氮肥和磷肥利用率的影响

Influence of Fertilization on the Nitrogen and Phosphorus Use Efficiency in Sugarcane Cropping System

为了解甘蔗种植体系中施肥对氮肥和磷肥利用率的影响,我们对不同氮磷施肥量下甘蔗对氮肥和磷肥的利用率进行研究。结果表明,施肥量是影响肥料利用率的最主要因素,不同施肥处理的氮肥利用率3年平均为19.1%~26.3%,磷肥利用率平均为12.0%~15.3%。其中优化施肥的氮肥利用率和磷肥利用率均为最高,在优化施肥的基础上增加50%的施氮量或50%的施磷量均显著降低氮肥利用率或磷肥利用率。在当地的试验条件下,每公顷施用N300kg不仅能获得较高的甘蔗产量,而且能达到提高氮肥利用率的目的。

In order to understand the influence of fertilization on the fertilizer use efficiency in sugarcane cultivation,this article studied the nitrogen and phosphorus use efficiency at different application rates in sugarcane production.The results showed that the amount of fertilizer greatly affected the fertilizer use efficiency.The average fertilizer use efficiency was 19.1-26.3%for N and 12.0-15.3%for P,the highest resulted from the OPT treatment.On the basis of OPT rates,adding additional 50%of N or P significantly decreased the fertilizer use efficiency.Application of 300 kgN/ha could not only obtain higher sugarcane yields,but also improve the nitrogen use efficiency.