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研究 4种包膜型控释肥料养分释放及温度对释放过程的影响。供试 4种肥料具有指数线形和 S线形释放特征曲线。指数线型控释肥料与 SU GIHARA方程和 S线型控释肥料与 ISHIBASHI改进方程有良好的拟合性。4种包膜型控释肥料的养分释放曲线符合初始诱导期校正参数 tau的一级反应模型。具有指数释放特征曲线包膜型控释肥料的 tau可给出零。为了养分的开始释放 ,需要一定量的水分透入包膜肥料内 ,HCRF S70需要透入的水比HCRF E5 0的多。养分释放呈指数曲线形的 HCRF E5 0和养分释放呈 S曲线形的 HCRF S70在释放机理上没有差异。与指数曲线形的 HCRF E5 0相比较 ,S曲线形的 HCRF S70养分释放推迟是由于养分开始释放时所需水分量较大。因此 ,养分释放呈 S曲线形的控释肥料的诱导期依存于温度。
The effects of nutrient release and temperature on the release process of four kinds of coated controlled release fertilizers were studied. The four fertilizers tested had exponential and S-shaped release profiles. The exponential linear controlled release fertilizers have a good fit with SU GIHARA equation and S-line controlled release fertilizer and ISHIBASHI equation. The nutrient release profiles of the four kinds of coated controlled release fertilizers were in accordance with the first order reaction model of tau, the initial parameter of the induction period. Tau with an exponential release profile coated controlled release fertilizer gives zero. In order for the nutrient to begin to release, a certain amount of moisture is required to penetrate into the coated fertilizer, and HCRF S70 requires more water than HCRF E50. There was no difference in release mechanism between nutrient release HCRF E50 with an exponential curve and HCRF S70 with a nutrient release S-curve. The delayed release of S-shaped HCRF S70 compared to exponential curved HCRF E50 was due to the greater amount of water required for nutrient release to begin. Therefore, the release of nutrients is S-shaped controlled release fertilizer induction period dependent on temperature.