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将Shaviv方程和Richards函数用于桐油包膜复合肥料单个颗粒养分释放数据的拟合,估算出养分释放的滞后时间(tlag)、包膜的肥料透过系数P(?)及养分释放的速度常数k和养分释放曲线的形状因子do结合包膜复合肥料颗粒的粒径r和包膜厚度l探讨了两组拟合参数与养分释放实测结果之间的关系。结果表明,两种方法均能很好地对养分释放曲线进行拟合并对养分释放规律进行正确的描述,桐油包膜的P(?)均值为2.1 ×10-4cm2day-1,桐油包膜复合肥料单个颗粒以滞后时间接近于0day,平均养分释放速度常数0.24day-1释放其养分。养分释放曲线的形状因子介于-1.00--0.45之间,养分释放曲线兼有饱和型和S型曲线的特征,t50与k及t50和k与rl/P(?)之间均有良好的线性相关性。
Using the Shaviv equation and the Richards function for the fitting of the single particle nutrient release data of the tung oil-coated composite fertilizer, the lag time (tlag), the fertilizer permeability coefficient P (?) And the rate of nutrient release k and nutrient release curve shape factor do combination of coated composite fertilizer particle size r and capsule thickness l to explore the two sets of fitting parameters and the relationship between the measured results of nutrient release. The results showed that both of the two methods could well fit the nutrient release curve and correctly describe the nutrient release law. The average P (?) Of the tung oil capsule was 2.1 × 10-4cm2day-1, Fertilizer single particles with lag time close to 0day, the average nutrient release rate constant 0.24day-1 to release their nutrients. Nutrient release curve shape factor between -1.00--0.45, the nutrient release curve both saturation and S-curve characteristics, t50 and k and t50 and k and rl / P (?) Have good between Linear correlation.