Nitrogen release characteristics of polyethylene-coated controlled-release fertilizers and their dependence on membrane pore structure

文献类型： 外文期刊

第一作者： Yang, Xiangdong

作者： Yang, Xiangdong;Li, Yanting;Li, Juan;Zhao, Bingqiang;Yang, Xiangdong;Jiang, Rongfeng;Lin, Yangzheng

作者机构：

关键词： Controlled-release fertilizer;Nutrient release period;Membrane pore structure;Mercury porosimetry;Pore size

期刊名称：PARTICUOLOGY （ 影响因子：3.067； 五年影响因子：3.387 ）

ISSN： 1674-2001

年卷期： 2018 年 36 卷

页码：

收录情况： SCI

摘要： In this study, controlled-release fertilizers (CRFs) with five different nitrogen release periods were prepared by coating large urea particles with polyethylene (PE) membranes under various experimental conditions. The preliminary and differential solubility rates, release periods, and membrane pore sizes of the obtained CRFs were measured using water immersion, scanning electron microscopy, and mercury porosimetry. For all CRF samples, the median pore diameters of the membranes were equal to 4.5-5.3 nm and pores with sizes smaller than 10 nm accounted for 86-96% of the total pore surface area. The obtained pore diameter distributions differed for the five studied types of CRF, having release periods of 1, 2, 4, 6, and 8 months. Thus, for the CRFs with a 1-month release period, the maximum pore diameter reached a magnitude of 4000 nm, while this value did not exceed 30 nm for the CRFs with a release period of 8 months. Hence, we have established a relationship between the release period of CRFs and their effective maximum pore sizes. (C) 2017 Chinese Society of Particuology and Institute of Process Engineering, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.

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