施肥是提高水稻生产力的主要因素之一。在主要的植物养分中,氮一直是水稻生产的关键元素。在印度将近40％的总耗氮量用于水稻施肥,而尿素是主要的氮源。水稻对所施氮肥的利用率约为30—40％。在减少氮素损失的方法中,分期施用、施于还原层、使用各种硝化抑制剂和各类长效肥是有效的。新近介绍的双氰胺混合尿素在印度尚未广泛试验,所以我们进行本试验以比较双氰胺混合尿素、楝子饼包膜尿素、双氰胺混合尿素和大粒尿素作一次基肥施用与普通尿素分期施用对水稻(Oryza Satira Linn)的效应。 Fertilization is one of the main factors to improve rice productivity. Of the major plant nutrients, nitrogen has been a key element in rice production. Nearly 40% of total nitrogen consumption in India is used for rice fertilization, while urea is the main nitrogen source. Rice utilization of nitrogen fertilizer is about 30-40%. In the method of reducing the nitrogen loss, it is effective to apply by stages, apply to the reduction layer, and use various nitrification inhibitors and various types of long-acting fertilizers. The newly introduced dicyandiamide mixed urea has not been extensively tested in India, so we conducted this experiment to compare dicyandiamide mixed urea, neem seed cake coated urea, dicyandiamide mixed urea, and macroalbum urea for a basal application and a normal urea staging Effect on rice (Oryza Satira Linn) application.