不同氮磷施用量对甘蔗产量及氮肥、磷肥利用率的影响

为了解甘蔗种植体系中施肥对氮肥和磷肥利用率的影响,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300 kg N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,氮肥利用率达到45.6%。

Effect of N Fertilizer and P Fertilizer Amount on Fertilizer Use Efficiency in Sugarcane Yield

In order to understand the influence of fertilization amount on the fertilizer use efficiency in sugarcane cultivation, this paper studied the N fertilizer and P fertilizer use efficiency at different applied rates with the result showing that the amount of fertilizer considerably affected the fertilizer use efficiency.In three years of various fertilization treatments,the average use efficiency of N fertilizer was 19.1 %-26.3 %,and the average use efficiency of P fertilizer was 12.0 %-15.3 %.N fertilizer and P fertilizer use efficiency in the optimized fertilization was proved to be the highest,however an extra 50 % of N fertilizer or P fertilizer in the optimized fertilization model dramatically brought down the use efficiency of N fertilizer and P fertilizer.Under the circumstances of local experiments,the application of 300 kg N fertilizer per hectare on one hand boosted sugarcane production;on the other hand it raised the use efficiency of N fertilizer to 45.6 %.