玻璃基质缓释肥料的养分淋溶特性研究

以自制的玻璃基质缓释肥料为供试材料,采用土壤淋溶方法,研究玻璃缓释肥料在土壤中的养分释放规律。结果表明:培养28d后玻璃肥料的氮、钾累积释放率分别为普通肥料的81.34%和75.32%(P<0.01),极大的减少了养分淋溶损失。玻璃肥料在淋溶的中后期仍有一定的氮、钾释放速率和释放量,减少了养分损失率,有效地延长了氮、钾养分供应期,具有明显的缓释效果。

The Nutrient Leaching Characteristics of Controlled Release Fertilizer with Glass Matrix

By way of the controlled release fertilizer with glass matrix as tested material,the present study was conducted to explore the nutrient leaching characteristics of controlled release fertilizer with glass matrix by soil column leaching method.The results showed that :after 28 days incubation,the accumulative leaching rate of nitrogen and potassium in soil columns of glass fertilizer was 81.34% and 75.32%(P<0.01) of the conventional fertilizer.At the midterm and anaphase of incubation,the glass fertilizer still displayed a leaching rate and release outlet of nitrogen and potassium relatived to conventional fertilizer.These results implied that the glass fertilizer possessed good sustained release features,it could reduce fertilizer loss and improve nutrient utilization of nitrogen and potassium avaiably.