控释肥包衣剂的控释性能研究

Study on Controlled-release Properties of Coating-agent for Controlled-release Fertilizer

为了探明控释肥包衣剂的控释性能,参考国标GB/T 8572-2001对样品进行前处理,测定样品中N、P、K含量,并测定包衣肥中养分初期释放率、微分释放率和养分累积释率。结果显示:包衣肥中养分N、P、K的初期释放率<15%,其中N的初期释放率大于P和K的初期释放率;与未包衣的对照肥相比,包衣肥养分N、P、K的初期释放率均明显降低,包衣肥中养分的释放更均匀平稳,能够满足作物生长中对养分的需求,提高肥料利用率,表明控释肥包衣剂的控释性能良好。

In order to explore the controlled release properties of coating- agent, the author carried outpretreatment of the samples referring to the national standard GB/T 8572-2001 and measured N, P, K contentin the samples. The initial release rate, differential release rate and cumulative release rate of coated fertilizernutrients were detected. The results showed that the initial release rates of N, P, K in the coated fertilizer wereless than 15%, and the initial release rate of N was greater than that of P and K. Compared to the uncoatedfertilizer, the initial release rates of N, P and K of the coated fertilizer were significantly lower, nutrients in thecoated fertilizer could release more evenly, and could meet the nutrients demand of crop growing and improvethe fertilizer use efficiency. The data proved that the controlled-release fertilizer had good controlled-releaseproperties.