在试验基础上,分析讨论了滴灌施肥条件下尿素在土壤中运移转化分布规律。研究表明滴灌条件下尿素分子在对流--扩散机理作用下其运移分布规律和水分基本保持一致。尿素在土壤中水解转化的速度很快,三天时间几乎全部转化。尿素转化速度与灌水量在一定范围内呈正相关。滴灌条件下,尿素分子也存在被土壤胶体吸附的现象。 Based on the experiment, the rule of urea transport and transformation in soil under drip irrigation was analyzed and discussed. The results show that under the condition of drip irrigation, the migration and distribution of urea molecules are basically consistent with the water under the action of convection-diffusion mechanism. Hydrolysis of urea in soil hydrolysis conversion very fast, almost all three days time conversion. The rate of urea conversion and the amount of water in a certain range was positively correlated. Under drip irrigation, urea molecules are also adsorbed by soil colloids.