不同类型包膜控释尿素养分释放规律的比较

[目的]为包膜控释尿素在不同类型土壤中的应用提供参考。[方法]以硫包膜与树脂包膜控释尿素为材料,比较研究了它们在壤土与黏土中养分释放的规律。[结果]硫包膜尿素前期（10 d之前）养分释放速率显著高于树脂包膜尿素,而后期（30 d之后）养分释放速率则低于树脂包膜尿素,可见树脂包膜的控释效果较硫包膜好。2种包膜尿素在壤土中的养分释放速率均高于黏土,说明土壤类型对包膜控释肥料的养分释放有显著影响。[结论]树脂包膜尿素适于壤土和黏土类型中施用,硫包膜尿素较适于在黏土类型中施用。

Comparison of the Nutrients Release Patterns of Different Coated Controlled-Release Urea

[Objective] The study aimed to supply references for applying the coated controlled-release urea in different soil conditions.[Method] With sulfur-coated urea and polymer-coated urea as the test materials,their nutrient release patterns in loam soil and clay soil were comparatively studied.[Result] The nutrient release rate of sulfur-coated urea was significantly higher than that of polymer-coated urea during the first ten days,while markedly lower than that of polymer coated urea after 30 day,which indicated that polymer-coated urea achieved better controlled-release effect than sulfur-coated urea.Both of the two coated urea had higher nutrient release rates in the loam soil than in clay soil,which showed that the nutrient release of the coated fertilizers was obviously influenced by the soil conditions.[Conclusion] Polymer-coated urea was applicable to both the loam and clay soil,while the sulfur-coated urea was more applicable to the clay soil.