利用化学方法或微生物作用,延长氮肥肥效。加工方法有二:一为肥料颗粒表面复盖一层薄膜,另一类是添加不溶性或难溶性物质。利用薄膜或填充物来控制肥料成分溶出速度,达到延长肥效的目的。其特点是:①减少肥分流失,延长肥效可达一个月甚至数个月以上;②控制作物生育初期的过多吸收肥料,以提高肥效;③减轻或避免因肥料 Use of chemical methods or the role of microorganisms to extend nitrogen fertilizer efficiency. There are two processing methods: one for the fertilizer particle surface covered with a thin film, the other is to add insoluble or insoluble material. The use of film or filler to control the dissolution rate of fertilizer ingredients, to achieve the purpose of extending fertilizer efficiency. Its features are: ① reduce the loss of fertilizer to extend fertilizer efficiency up to a month or even months or more; ② control the early crop growth of excessive absorption of fertilizer to improve fertilizer efficiency; ③ reduce or avoid fertilizer