College of Land and Environment, Shenyang Agricultural University, Shenyang 110866, Liaoning, China; National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, Shenyang 110866, Liaoning, China; Key Laboratory of Arable Land Conservation (Northeast China), Ministry of Agriculture, Shenyang 110866, Liaoning, China.
College of Land and Environment, Shenyang Agricultural University, Shenyang 110866, Liaoning, China; National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, Shenyang 110866, Liaoning, China; Key Laboratory of Arable Land Conservation (Northeast China), Ministry of Agriculture, Shenyang 110866, Liaoning, China.
Sci Total Environ. 2018 Feb 15;615:431-437. doi: 10.1016/j.scitotenv.2017.09.209. Epub 2017 Oct 5.
To enhance the effectiveness of polyvinyl alcohol (PVA) coated fertilizers, a novel slow-release fertilizer was developed using biochar and waterborne copolymer of PVA and polyvinylpyrrolidone (PVP) as coating materials. The effects of botanical origins and doses of biochar as well as copolymer concentrations on biochar-copolymer structures and properties were investigated. Our results indicated that the water absorbency of blend films differing in biochar origins showed different responses to these three factors. Generally, biochar decreased water absorbency of copolymer with an increased degradability, and contributed to improving the slow-release property of coated urea. In particular, rice biochar-based copolymer (S5 film) had less hydrophilic OH bonds and encapsulated urea granules more compactly and densely. The urea particles coated with rice biochar-based copolymer (S5 film) exhibited an excellent release behavior of 65.28% nutrient leaching on the 22th day. Therefore, this work has demonstrated the potential of biochar-based copolymer from different botanical biochar for improving the effectiveness of fertilizers.
为了提高聚乙烯醇（PVA）涂层肥料的效果，本研究采用生物炭和聚乙烯醇（PVA）与聚乙烯吡咯烷酮（PVP）的水基共聚物作为涂层材料，开发了一种新型缓释肥料。考察了生物炭的植物来源和用量以及共聚物浓度对生物炭-共聚物结构和性能的影响。结果表明，不同生物炭来源的共混膜的吸水性对这三个因素表现出不同的响应。一般来说，生物炭降低了共聚物的吸水性，同时提高了共聚物的可降解性，有助于提高包膜尿素的缓释性能。特别是，以水稻生物炭为基础的共聚物（S5 膜）具有较少的亲水性 OH 键，并且更紧密、更密集地包裹尿素颗粒。用水稻生物炭为基础的共聚物（S5 膜）包裹的尿素颗粒在第 22 天表现出 65.28%的养分浸出率的优异释放行为。因此，这项工作证明了来自不同植物源生物炭的生物炭基共聚物在提高肥料效果方面的潜力。
