Material Science and Engineering College, Northeast Forestry University, Harbin 150040, China.
Material Science and Engineering College, Northeast Forestry University, Harbin 150040, China.
Int J Biol Macromol. 2019 Jun 15;131:412-419. doi: 10.1016/j.ijbiomac.2019.03.047. Epub 2019 Mar 7.
Saline-alkali soil and fertilizer loss severely restrict agriculture on the Songnen Plain in China. To resolve this problem, carboxymethyl cellulose immobilized slow-release fertilizer microspheres (CFM) with homogeneity pore structure, high porosity, biodegradable biological macromolecules and excellent fertilizer absorbency were synthesized by the combination of inverse emulsion polymerization and microfluidic method. By optimizing the synthesis conditions, the water absorption of CFM reached 8725 g g in deionized water. The absorbency behaviors of CFM were highly sensitive to pH, ionic strength, and ionic species. In 5 g L urea solution, the adsorption capacity of CFM was 3342.84 g g. The CFM showed excellent urea retention at 80 °C for 5 h and sustained release performance in soil. Besides, degradation rate of CFM was closed to 98.2% in Aspergillus niger at the third day. CFM had the advantages of high pH sensitivity, salt resistance, and good fertilizer absorbency and retention. Therefore, it will be prospecting fertilizer sustained release agent in agriculture.
盐碱土和肥料损失严重限制了中国松嫩平原的农业发展。为了解决这个问题，通过反相乳液聚合和微流控方法相结合，合成了具有均匀孔结构、高孔隙率、可生物降解的生物大分子和优异的肥料吸收能力的羧甲基纤维素固载型缓释肥微球（CFM）。通过优化合成条件，CFM 在去离子水中的吸水率达到 8725g/g。CFM 的吸收行为对 pH 值、离子强度和离子种类高度敏感。在 5g/L 尿素溶液中，CFM 的吸附容量为 3342.84g/g。CFM 在 80°C 下保持 5 小时具有优异的尿素保留性能，并在土壤中具有持续释放性能。此外，CFM 在第三天的黑曲霉中的降解率接近 98.2%。CFM 具有高 pH 值敏感性、耐盐性和良好的肥料吸收和保持能力。因此，它将成为农业中具有前景的肥料缓释剂。
