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铵钾磷共施是农业生产中的普遍现象,而铵钾对磷的释放的影响决定着土壤中磷对植物的有效性和对水体环境的潜在危害性。试验以太湖黄泥土为试材,通过连续提取法,对铵钾磷共处理土壤磷的释放进行了研究,并对磷的释放动力学进行了不同模型的拟合。结果表明:铵磷共处理土壤,随着氯化铵加入量的增加,磷的释放量、释放率和释放总量均下降;钾磷共处理土壤,随着氯化钾加入量的增加,磷的释放量、释放率和释放总量均增加;铵钾磷共处理土壤,磷的释放量、释放率和释放总量介于其间。通过比较不同模型拟合决定系数R2的大小,磷的释放动力学用零级方程、双常数方程和Parabolic扩散方程拟合效果最好。
Ammonium, potassium and phosphorus co-application is a common phenomenon in agricultural production, and the impact of ammonium and potassium on the release of phosphorus determines the effectiveness of phosphorus in the soil on plants and the potential hazard to the water environment. Experiments were conducted to study the release of phosphorus from soil with ammonium, potassium and phosphorus by continuous extraction method. The kinetics of phosphorus release was fitted by different models. The results showed that with ammonium and phosphorus co-treatment, with the addition of ammonium chloride, the amount of phosphorus released, the release rate and the total release decreased. Soil potassium and phosphorus co-treatment, with the increase of potassium chloride, phosphorus The release amount, release rate and total amount of the release increased; ammonium, potassium and phosphorus co-treatment of soil, phosphorus release, release rate and total release in between. By comparing the size of the coefficient R2, the release kinetics of phosphorus is best fitted by the zero-order equation, the two-constant equation and the Parabolic diffusion equation.