我们连续三年在不同土质上进行了多点试验,初步摸索出一些提高稻田氮肥利用率的方法。一、合理深施,减少损失:稻田用氮素化肥作基肥,以往多采用面施法。随着用量增多,单纯面施则肥效降低。主要原因是氮素挥发量增大,而且在田面氧化层中,易被转化为硝态氮,因而损失多,肥效短。为此,我们进行了深施、全层施、面施三种方法的对比试验,结果以深施的较好,全层施次之, We have carried out more experiments on different soil types for three consecutive years, and initially explored some ways to improve the utilization rate of nitrogen fertilizer in paddy fields. First, a reasonable deep facilities to reduce losses: Paddy nitrogen fertilizer as a base fertilizer, the past use of surface method. With the increase in dosage, simple surface fertilizer is reduced efficiency. The main reason is the increased amount of nitrogen volatilization, but also in the field oxide layer, easily converted to nitrate nitrogen, so the loss of more, short effective. To this end, we conducted a deep test, full-scale application, the three methods of comparison test, the results of the deep facilities of the better,