果树施用尿素后不宜立即灌水尿素属酰胺态氮肥，酰胺态氮素植物不能直接吸收利用，土壤对它的吸附量也很少，在土壤中的流动性和淋失性并不比硝铵小，但在尿酶的作用下进行氨化，转化为碳酸铵或碳酸氢铵后，带正电荷的铵离子多被土壤吸附保存，其流动淋失性就很小了。尿素... Fruit trees should not be irrigated immediately after the application of urea urea nitrogen amide, nitrogen amide plants can not be absorbed directly, the amount of soil adsorption is also very small, fluidity and leaching in the soil is not smaller than ammonia, but Ammonification under the action of urease, ammonium carbonate or ammonium bicarbonate into a positive charge of ammonium ions are adsorbed by the soil and more, the flow letdown is very small. Urea