化学肥料常识（二）（３）酰胺态氮肥─—尿素这是人工合成的有机氮肥，含氮量４３％～４６％，是我国目前所有固体化肥中含氮量最高的化肥品种。商品尿素为白色粒状晶体，易溶于水。尿素施入土壤后，以分子状态存在，除作物根系能吸收少量外，大部分要在土壤微生物分泌的... (3) Amide nitrogen fertilizer ─ ─ urea This is a synthetic organic nitrogen fertilizer, nitrogen content of 43% to 46%, is China’s current solid fertilizer all the nitrogen content of the highest nitrogen fertilizer varieties. Commodity urea granular white crystal, soluble in water. After the urea is applied to the soil, it exists in the molecular state, except for the small amount of the root system that can be absorbed, most of which is secreted by the soil microorganism ...