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以包膜控释肥为试验材料,通过静水释放试验测定其养分释放速率。结果表明,控释肥的养分累积释放曲线呈“S”形或“抛物线”状;影响控释肥养分释放的控释因子主要是温度、包膜厚度及添加剂等;提高浸提温度其释放速率明显加快,增加包膜厚度其释放速率显著降低。控释肥养分释放机理为:水蒸气透入包膜内,逐渐形成饱和养分溶液,同时包膜被水蒸气膨胀,导致膜上微孔增大,使养分逐渐扩散溶出。
The coated controlled release fertilizer was used as the experimental material, and the release rate of nutrients was measured by static water release test. The results showed that the cumulative release curve of controlled release fertilizer showed “S” shape or “parabola” shape. The controlled release factors affecting release of controlled release fertilizer mainly included temperature, coating thickness and additives, and the release rate Significantly accelerated, the capsule thickness increased its release rate was significantly reduced. Controlled release fertilizer nutrient release mechanism: water vapor penetrate the envelope, the gradual formation of saturated nutrient solution, while the envelope is expanded by water vapor, resulting in increased micropores on the membrane, the gradual diffusion and dissolution of nutrients.