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尿素是氮素化肥中有效成分最高的优质肥料,含氮量为46%,属中性有机态化肥。长期施用不会酸化或碱化土壤,对任何土壤均无副作用。但施用量也不宜过多,若用量过多,方法不当,往往效果较差甚至造成减产或颗粒无收。科学施用尿素的方法是:(1)不宜表施,应该沟施、施穴,施后要复土,或者全层深施。尿素深施除了可减少挥发损失外,还因为处于深层的尿素氨化、硝化的速度和强度都比较弱,利于保存肥分,同时深层
Urea is the highest quality fertilizer with the highest active ingredient in nitrogenous fertilizer with 46% nitrogen content, which is a neutral organic fertilizer. Long-term application will not acidify or alkalize the soil, no side effects on any soil. However, the amount should not be too much, if the amount of too much, improper method, the effect is often poor or even reduce production or crop failure. The scientific method of urea is: (1) should not be applied, it should be ditch Shi, Shi points, Shi after the earth, or full depth facilities. In addition to deep application of urea can reduce the loss of volatility, but also because in the deep ammoniation of urea, nitrification speed and intensity are relatively weak, help save fat, while deep