影响包膜尿素氮溶出的因素

利用高分子聚合物为包膜材料，根据涂膜量不等制得CU1、CU2两种包膜尿素，通过室内培养试验，测试了外界环境因子对其氮释放的影响。结果表明，包膜尿素氮的溶出受土壤含水量和介质离子浓度的影响，含水量增加，溶出加快，但土壤含水量达到饱和持水量以后对氮溶出影响较小；介质离子浓度越高，氮溶出越慢；温度对包膜尿素氮溶出的影响较小。

Effect of differentfactors on nitrogen solubility of coated urea

Two forms of coated urea (CU1,CU2) consisted of granule urea coated with high molecular polymer in different thickness were used to study the effect of soil moisture, ion concentration and temperature on nitrogen solubility. The results indicated that the nitrogen solubility of CU was affected by soil moisture contents and ion concentration of soil solution. Nitrogen release rate hardly changed when soil moisture reached to saturation or more. However, the higher the ion concentration of soil solution was, the less the nitrogen released. The nitrogen release rate was not affected by temperature.