Recommended Values for the Hydrophobicity and Mechanical Properties of Coating Materials Usable for Preparing Controlled-Release Fertilizers

文献类型： 外文期刊

第一作者： Wang, Yajing

作者： Wang, Yajing;Li, Juan;Lin, Ru;Gu, Dianrun;Zhou, Yuanfang;Li, Han;Yang, Xiangdong

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关键词： controlled-release fertilizer; coating material; hydrophobicity; mechanical property

期刊名称：POLYMERS （ 影响因子：5.0； 五年影响因子：5.0 ）

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年卷期： 2023 年 15 卷 24 期

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收录情况： SCI

摘要： The hydrophobicity and mechanical properties of coating materials and the nitrogen (N) release rates of 11 kinds of controlled-release fertilizers (CRFs) were determined in this study. The results show that the N release periods of the CRFs had negative correlations with the water absorption (WA) of the coating materials (y = 166.06x(-1.24), r = 0.986), while they were positively correlated with the water contact angle (WCA) and elongation at break (EB) (y = 37.28x(0.18), r = 0.701; y = -19.42 + 2.57x, r = 0.737). According to the fitted functional equation, CRFs that could fulfil the N release period of 30 days had a coating material WA < 2.4%, WCA > 68.8 degrees, and EB > 57.7%. The recommended values for a CRF that can fulfil the N release period of 30 days are WA < 3.0%, WCA > 60.0 degrees, and EB > 30.0% in the coating materials. CRFs with different nutrient release periods can be designed according to the recommended values to meet the needs of different crops. Furthermore, our experiments have illustrated that the N release period target of 30 days can be reached for modified sulfur-coated fertilizers (MSCFs) by improving their mechanical properties.

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