作为肥料施入土壤中的氮素,作物只利用了50%,其余50%是一种经济上的损失。损失的氮素如被淋洗渗入地水,将造成环境的污染,危害人类健康。现制成一种硫衣尿素(SCU)它是在普通氮肥尿素颗粒表面涂上硫,再用蜡之类封闭物涂封起来。封闭物在土壤微生物的作用下降解,使得尿素能够通过硫衣上的孔隙扩散开来。在作物需氮量增加的相同条件下,当土壤 As a fertilizer applied to soil nitrogen, crops use only 50%, the remaining 50% is an economic loss. Loss of nitrogen, such as leaching into the groundwater, will cause environmental pollution, endangering human health. Is made of a sulfur clothes urea (SCU) It is in the ordinary nitrogen urea particles coated with sulfur, and then sealed with wax or the like coating. Closures degrade under the action of soil microorganisms, allowing urea to diffuse through the pores of the sulfur coat. Under the same conditions of increased crop nitrogen demand, when the soil