In this paper, the effects on FMP dissolving from the concentration of activator solution, the diameter of FMP, the space velocity, the time and the temperature was discussed. And explicit mathematical models have been developed to predict and control the release rate of P2O5 from FMP. The kinetic model was given byyt=-6.09+214.80C0+18A9Rt-23.63C0Rt+5.65R03V0Rt-3 -6.22R03V0Rt-2 (4-6)Calculation and actual value were developed and compared with numerical solution for the concentration of P2O5. The results indicated that the error between calculation and actual value is no more than 12% and acceptable.This thesis provides a theoretical base for the developing of the technology for fertigation using Calcium-Magnesium Phosphate (FMP). |