两种缓控释尿素缓释特性比较分析

Comparison and Analysis on the Release Characteristics of Two Different Slow Controlled Release Fertilizers

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,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,释放周期长,其养分释放期可达43 d,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,释放周期短,养分释放期为28 d,其在35 d前释放速率较快,35 d已累积释放84.63%,后期尿素释放较少,释放速率趋于平缓。

The release characteristics of two different slow controlled release fertilizers were compared by the method of leaching 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.