PDF(Pubmed)
Abstract：
In agriculture, hydrogels can be addressed for effective operation of water and controlled-release fertilizers. Hydrogels have a significant ability for retaining water and improving nutrient availability in soil, enhancing plant growth while reducing water and fertilizer usage. This work aimed to prepare a hydrogel composite based on microalgae and biopolymers including chitosan and starch for use as a soil conditioner. The hydrogel composite was characterized by FTIR, XRD, and SEM. All hydrogel properties were studied including swelling degree, biodegradability, water-holding capacity, water retention, and re-swelling capacity in soil and water. The urea fertilizer loading and releasing behavior of the prepared hydrogels were investigated. The results revealed that the range of the maximal urea loading was between 99 and 440%, and the kinetics of loading was fitted with Freundlich model. The urea release % exhibited 78-95%, after 30 days, and the kinetics of release was fitted with zero-order, Higuchi, and Korsmeyer-Peppas models. Furthermore, the prepared hydrogels obtained a significant water-holding capacity, after blending soil (50 g) with small amount of hydrogels (1 g), the capacity increased in the range of 99.4-101.5%. In sum, the prepared hydrogels have the potential to be applied as a soil conditioner.
摘要：
在农业方面,水凝胶可用于水和控释肥料的有效操作。水凝胶具有显著的保持水分和提高土壤养分利用率的能力,促进植物生长，同时减少水和肥料的使用。这项工作旨在制备基于微藻和包括壳聚糖和淀粉的生物聚合物的水凝胶复合材料，用作土壤改良剂。通过FTIR对水凝胶复合材料进行了表征,XRD,和SEM。研究了所有水凝胶的性质，包括溶胀度，生物降解性，保水能力，保水,以及在土壤和水中的再膨胀能力。研究了制备的水凝胶的尿素肥料负载和释放行为。结果表明，最大尿素负荷范围在99％至440％之间，加载动力学用Freundlich模型拟合。尿素释放%表现为78-95%，30天后,释放动力学符合零级，Higuchi,和Korsmeyer-Peppas模型。此外，制备的水凝胶获得了显著的保水能力，将土壤（50克）与少量水凝胶（1克）混合后，容量在99.4-101.5%的范围内增加。总之,所制备的水凝胶具有用作土壤改良剂的潜力。
