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根据氮素肥料大多采用含氮量较高尿素作为原料的特点,采用一种检测酰胺态氮的化学方法来研究包膜尿素态氮肥的缓释性能。通过水溶与土壤淋溶试验,对比分析氮素释放率曲线模型。结果表明:该方法能够基本上评价出包膜尿素态氮肥的缓释效果,尤其对疏水型材料包裹的尿素态氮肥评价更为贴切。
According to the characteristics of nitrogen fertilizers mostly using urea with higher nitrogen content as raw material, a chemical method for detecting amide nitrogen was used to study the sustained release performance of coated urea nitrogen fertilizer. Through the water-soluble and soil leaching test, the curve model of nitrogen release rate was comparatively analyzed. The results show that this method can basically evaluate the sustained release effect of coated urea nitrogen fertilizer, especially for the evaluation of urea nitrogen fertilizer wrapped by hydrophobic material.