控释肥料土壤中实际释放期快速预测方法

Rapid prediction method of controlled release fertilizer actual release period in soil

包膜控释肥料在土壤中实际释放期大多数在4~6个月甚至更长,为了快速预测控释肥料土壤中实际释放期,对3种不同包膜缓/控释肥料进行土壤中的养分释放特性测定,应用100℃快速浸提法测定的结果与之拟合,并对拟合结果进行评价和检验。结果表明,3种不同包膜的控释肥料在100℃的快速浸提结果与土壤中释放结果的拟合方程的拟合度均达到极显著水平,在土壤中释放期为4个月的包膜控释肥料在100℃下快速浸提只需6.2 h就可测出养分释放期。

The actual release period of coated controlled-release fertilizers in soil is mostly 4~6 months or longer.In order to rapidly predict the actual release period of coated controlled-release fertilizers in soil,the nutrient release characteristics of three different coated slow/controlled-release fertilizers in soil were measured.The results of rapid extraction at 100 ℃ were fitted with the results,and the fitting equation was evaluated and tested.The results showed that:The fitting degree of regression equation between the rapid extraction results of three coated slow/controlled release fertilizers at 100 ℃ and the release characteristics of soil reached a very significant level.The rapid extraction of coated controlled release fertilizers at 100 ℃ for 4 months only took 2 h to determine the release period of nutrients.