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应用恒温培养试验研究了适用于半干旱气候条件下的微水溶性胶结包膜肥料在不同土壤含水量条件下的氮素释放速率,并基于一级化学反应、采用田间试验数据构建了氮素释放预测方程。结果显示:微水溶性胶结包膜肥料氮素累积释放量与土壤含水量呈一定的正相关关系,在75 d左右的时候,在22%土壤含水量下其氮素释放达到了85%~90%,14%土壤含水量下达到了60%~82%,6%土壤含水量下达到了35%~42%。同时,田间试验结果也说明了微水溶性胶结包膜肥料氮素瞬时释放速率受降雨及土壤含水量的影响显著;在降雨后或土壤含水量高的情况下,微水溶性胶结包膜肥料的释放速率加快。在此基础上,通过最小二乘法求参等方式构建了以土壤含水量为主要因子的微水溶性胶结包膜肥料氮素释放预测方程,预测值与实测值拟合程度较好,决定系数达到了0.976。
Based on the first-order chemical reaction, field experiments were carried out to study the effects of nitrogen release rate on nitrogen-releasing rate of micro-water-soluble cement film coated fertilizers under semi-arid climate conditions. Prediction equation. The results showed that there was a positive correlation between the cumulative amount of nitrogen release and the soil water content in the water-soluble cement film-coated fertilizers. At about 75 days, the nitrogen release reached 85% -90% at 22% soil moisture %, 14% soil moisture reached 60% ~ 82%, 6% soil moisture reached 35% ~ 42%. At the same time, the results of field experiments also showed that the instantaneous release rate of nitrogen was significantly affected by rainfall and soil water content. After rainfall or high soil moisture content, the water-soluble cementing coated fertilizer Release speed to speed up. On this basis, the equation of nitrogen release of micro-water-soluble cement film coated fertilizers with soil water content as the main factor was constructed by the method of least squares, and the predicted value fitted well with the measured value, and the coefficient of determination reached 0.976.