Abstract Polymer coated fertilizer has been designed for gradual release of nutritional content of fertilizer to improve the utilization efficiency. However, the better slow release property of the coated fertilizer and simplified preparation process are still a huge challenge. The hydrophobic ODA-polyphenol film coated urea was prepared by one-step spraying for excellent nutrient release performance. Octadecylamine (ODA) was used to modify poly(tannic acid) (PTA) and poly(pyrogallol) (PPG) coating on substrates and prepare the hydrophobic ODA-PTA and ODA-PPG coated urea granules. The nutrient release rate of ODA-PTA and ODA-PPG coated fertilizers was much slower than PTA and PPG coated fertilizers in water and soil. The N release longevities of ODA-PTA coated fertilizers will be extended from 2 hours to 30 days compared with PTA coated fertilizers. Moreover, pot experiments showed that coated fertilizer could effectively promote plant growth. This work will provide one-step spraying co-deposition approach to fabricate hydrophobic ODA-polyphenol film coated urea to improve the N release longevity, which can shine a light on the development of new slow release fertilizers (SRFs).

中文翻译：

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一步喷涂共沉积疏水性十八胺-多酚薄膜包衣缓释尿素

摘要 聚合物包膜肥料是为了逐步释放肥料的营养成分以提高利用效率而设计的。然而，包膜肥料更好的缓释性能和简化的制备工艺仍然是一个巨大的挑战。疏水性ODA-多酚薄膜包衣尿素采用一步喷涂制备，具有优异的养分释放性能。十八胺（ODA）用于修饰基材上的聚（单宁酸）（PTA）和聚（苯并酚）（PPG）涂层，制备疏水性ODA-PTA和ODA-PPG涂层尿素颗粒。ODA-PTA 和 ODA-PPG 包膜肥料在水和土壤中的养分释放速率远低于 PTA 和 PPG 包膜肥料。与 PTA 包膜肥料相比，ODA-PTA 包膜肥料的氮释放寿命将从 2 小时延长至 30 天。此外，盆栽试验表明，包膜肥料能有效促进植物生长。这项工作将提供一步喷涂共沉积方法来制备疏水性 ODA-多酚薄膜包衣尿素，以提高 N 的释放寿命，为新型缓释肥料 (SRFs) 的开发提供借鉴。