通过静水溶出率法比较了两种缓控释尿素的缓控特性.结果表明袁两种不同缓控释尿素的初期养分释放率、养分释放期以及养分释放期内日平均释放速率均存在差异.A型缓控释尿素溶解速率慢袁释放周期长袁其养分释放期可达43 d袁其释放速率在60 d之内均呈上升趋势;B型缓控释尿素溶解速率快袁释放周期短袁养分释放期为28 d袁其在35 d前释放速率较快袁35 d已累积释放84.63%袁后期尿素释放较少袁释放速率趋于平缓.
AbStract: The release characteristics of two different slow controlled release fertilizers were comPared by the method of leach-ing in water. The results showed that there were differences in the initial nutrient release rate, the nutrient release longevity, and daily average release rates between the two different fertilizers. TyPe A slow-release urea had a slow dissolution rate and a long release Period, its nutrient release Period was 43 days, and the release rate showed an uPward trend within 60 days. TyPe B slow-release urea had a fast dissolution rate and a short release Period, which nutrient release Period was 28 days. The release rate of tyPe B slow-release urea was fast in 35 days, and the cumulative release was 84.63% in 35 days. Later release of urea was less, and the late release rate tended to be gentle.