【摘要】 应用Ｅｌｏｖｉｃｈ 和Ｍｉｔｓｃｈｅｒｌｉｃｈ 两个动态方程描述了昆阳磷矿石粉在酸性红壤和砖红壤中的溶解过程⒚统计分析表明，磷矿石粉在两种土壤中的溶解动态数据均能较好地适合这两个方程⒚在低施磷条件下， Ｍｉｔｓｃｈｅｒｌｉｃｈ 方程似乎比Ｅｌｏｖｉｃｈ 方程能更好地描述磷矿石磷在土壤中的释放⒚更多还原

【Abstract】 One of the modifications of the Elovich (or Roginsky Zeldovich) equation generally used to describe phosphate rock dissolution in soils is the form: y=(1/β) ln (αβ)+(1/β) ln t+ε , where y is the amount of phosphorus dissolved from applied phosphate rock at time, t; ε is the random error; and α and β are constants. An older model that has also been used to characterize phosphate rock dissolution in soils is the modified exponential relationship developed by Mitscherlich, which in one of its simple forms may be represented as: y=A (1- e - ct )+ ε , where y, t , and ε are as defined above; A is the asymptote; and c the coefficient of curvature. The investigation presented herein attempted to apply these two kinetic equations to describe the dissolution of Kunyang phosphate rock applied at the rates of 500 and 1 000 mg P kg -1 to two acid surface soils. Besides describing phosphate rock dissolution, the Mitscherlich equation was capable of more adequately estimating the amount over time of phosphorus released from phosphate rock applied at the lower rate in both soils. When the phosphate rock material was added at the higher rate, the model was not better than the Elovich equation in describing dissolution or in estimating the amount of phosphorus released to the two soils.更多还原