Longevity of controlled release modified resin fertilizer

Chinese. 探索和建立80℃高温下的快速检测方法（高温短期淋洗法），预测水溶性树脂包膜控释肥料在25℃常温下的肥效期。采用常温静水溶出试验和高温淋洗的方法，并对常温25℃与高温80℃下供试肥料达到相同养分释放率所需时间进行相关分析。树脂包膜控释肥料累积释放曲线都呈二次曲线，相关系数r均大于0.995。随着温度的升高供试控释肥料养分释放加快。利用常温25℃与高温80℃高温短期淋洗达到相同养分释放率所需时间的回归方程，并结合80℃的释放曲线方程，可以快速而准确地预测这种包膜控释肥料在常温下养分释放率达到75%所需要的时间，即肥效期。两种树脂包膜控释肥料Trincote 1和Trincote 2肥效期的预测值与实测值相对误差只有0.3%～6.9%。采用高温短期淋洗法可以在数小时内比较准确、迅速地预测控释肥料的肥效期，与传统的静水溶出率法或土柱淋溶法相比，结果更准确，而且大大缩短了检测时间。该方法可作为树脂包膜控释肥料肥效期或养分释放期的快速检测方法。

English. The study establish the rapid method to test and predict the longevity of CRFs coated by water soluble resin by use of the short-period leaching under high temperature. Still pure water dissolving incubation and high temperature drip washing were used to study the pattern of the nutrients release of the CRFs. The regression equations of periods required to reach the same cumulative release rates between 25℃ and 80℃. Patterns of cumulative nutrients release curve would fit to one factor quadric regression equation at each given temperatures, and all of relative co-efficient was bigger than 0.995. With the temperature increasing, nutrients release of the CRFs increased. The longevity of resin coated CRFs could be predicted by use of both the cumulative nutrients release equation at 80℃ and the regression equation of release time needed to reach the same cumulative release rates between 25℃ and 80℃. There were only 0.3% to 6.9% relative errors between the tested longevity and predicted one. In conclusion, the longevity of resin coated CRFs could more quickly and precisely be predicted by use of the high temperature short-term leaching method than that of the normal differential release rate. The longevity of resin coated CRF could be rapidly and precisely predicted in a few hours by application of the high temperature short-term leaching method.