高温-超低温处理对控释肥氮素释放特性的影响

采用水培和土培方法，探讨了2种组合的高温-超低温处理对MEISTER 180氮素释放特性的影响。结果表明，55℃处理期平均养分溶出率（η△t）为6.6%~8.9%；超低温处理期平均养分溶出率（η△t）为0.1%~0.6%。高温-超低温处理后MEISTER 180水中和土中氮素释放均呈直线型模式，相关系数R2在0.8552~0.9505之间；水中和土中养分溶出率比值变动范围在1.0~1.3之间，表明氮素释放受水分影响小，高温-超低温处理未改变MEISTER 180释放模式。

Effect of high and excessively low temperature treatments on nitrogen release characteristics of controlled release fertilizer

The nutrient release characteristics of controlled release fertilizer indicate the strength of controlled releasing and nutrient supply at specific time and can also reflect the quality of coated materials and the processing techniques. The nutrient release characteristics of MEISTER 180-day controlled release fertilizers were evaluated in this study. For the two different high and excessively low temperature treatments, water extraction and soil incubation methods were used in order to guide the application of MEISTER 180-day controlled release fertilizers.The results showed that the 55℃ temperature had a significant effect on the nutrient release characteristics of MEISTER 180-day controlled release fertilizers, with differential rates (η△_t) being 6.6 %-8.9%. The differential rates (η△_t) were 0.1 %-0.6% with excessively low temperature treatments. Nutrient release characteristics of MEISTER 180-day controlled release fertilizers showed linear relationships, with R² being 0.8552-0.9505 and the rate in water release and soil release were 1.0-1.3. The results showed that the temperature treatments and water content had little effect on nutrient release characteristics of MEISTER 180-day controlled release fertilizers.