粉煤灰包膜缓释肥养分释放特征分析

Nutrients Release Characteristics of Fly Ash Coated Slow-release Fertilizers

通过室内恒温土柱淋洗试验,研究了包膜在肥料中的质量分数分别为0.05,0.10和0.15时的3种缓释肥料养分释放规律。结果表明,28 d以后,粉煤灰包膜肥淋溶液NH+4-N和NO-3-N均高于普通复合肥处理;3种自制粉煤灰包膜肥料能降低氮、磷和钾素累计淋出率,且厚度越大效果越好。

Fly ash as the best performance coating materials was selected. In soil column leaching experiment, the nutrients release characteristics of three kinds of slow-release fertilizers with coating thickness, which were 15% ,20% and 25%, were studied. The results showed that after 28 days, the EC, NH4 -N, NO3- -N in leac- hing solution of fly ash coated fertilizer was higher than ordinary fertilizer treatment. The homemade coated fer- tilizer can reduce nitrogen, phosphorus and potassium leaching rate. In addition, the nitrogen, phosphorus and potassium leaching curves a quadratic equation.