混料设计法在控释肥配比中的应用研究

采用混料试验设计,探讨了包含多种供肥速度的速度复合型控释肥和单一供肥速度的单一速度型控释肥的养分释放速率。结果表明:(1)单一速度型控释肥(FP2,FP5和FP9)在养分快速释放期内,养分释放速率基本保持不变,其顺序为FP2>FP5>FP9;而对于速度复合型控释肥处理,其释放速率不是单一、固定不变的。(2)在培养-淋溶期间,对养分累积释放率≥30.0%的单一速度型控释肥料因子优化组合进行频数统计,发现控释肥FP2,FP5和FP9的混料比例分别为37.61%～45.02%,32.68%～40.83%和21.85%～23.94%。(3)模拟各肥料处理养分累积释放率的Richards函数方程的复相关系数均达到极显著水平,表明使用Richards方程能够准确地描述和预测养分的释放速率。

Study on combination of controlled release fertilizer by use of mixture experiment design

The nutrient release rates of single longevity controlled release fertilizer (CRF) and multi-longevity CRF were tested in comparison with each of the CRF respectively by use of mixture experiment design.Results showed that the release rate of the single longevity CRF (FP_2,FP_5 and FP_9) was stable and the order of release rate was in order of FP_2>FP_5>FP_9 during the rapid release period.However,the release rate of the 3-longevity CRF,formed by three single longevity CRFs,fluctuated during the same period.Frequency statistics was conducted among the optimum simulative combination of the single longevity CRFs,whose nutrient release rate was above 30.0% by use of soil-column leaching trials.The results indicated that the proportions of FP_2,FP_5 and FP_9 were from 37.61% to 45.02%,32.68% to 40.83% and 21.85% to 23.94% respectively.The multiple-correlation coefficients of Richards equation,which simulated the nutrient accumulative release rates of the multi-longevity CRF,reaching a significant level.Therefore,the nutrient accumulative release rates could be described and forecasted by Richards equation.