保水缓释钙肥的特征与性能  

Characteristics and performance of water-absorbent slow-release calcium fertilizer

作　　者：何绪生[1] 耿增超[1] HE Xu-sheng GENG Zeng-chao(College of Natural Resources and Environment, Northwest Agriculture and Forestry University, Yangling, Shaanxi 712100, China)

机构地区：[1]西北农林科技大学资源环境学院,陕西杨凌712100

出　　处：《干旱地区农业研究》2017年第1期85-90,共6页Agricultural Research in the Arid Areas

摘　　要：采用化学聚合反应将保水剂与硝酸钙聚合为一体化物质,并以吸水倍率、p H值、土壤水分特征曲线、元素分析、红外光谱、电子显微镜及7 d溶出率法表征保水钙肥的吸水持水能力、化学性质、形貌结构及养分释放性能。结果表明:保水缓释吸水倍率约为165 g·g-1,含钙量为103 g·kg-1,p H值近中性;保水剂通过化学键结合,基质包埋负载钙盐;网络孔隙及基质是保水钙肥吸水保水的物理结构;与对照相比,保水钙肥添加量为1%时,在测试吸力段可增加土壤容积含水量平均14.0%。此外,保水钙肥显示较好的钙素养分延缓释放性能,可将钙素较长时间保持在水凝胶基质内而延长水溶性钙有效期。Incorporating super absorbent polymer（ SAP） and calcium nitrate into one body by chemical polymerization,and then water-absorbent/-retaining capability,some chemical properties,morphology and nutrient release performance of water-absorbent calcium fertilizer（ WACF） were characterized by water absorbency,soil water characteristic curve,ultimate analysis,IR,SEM and 7-day dissolution rate. The results show that the WACF has water-absorbency of approximately 165 g·g^-1,103 g·kg^-1of calcium content,nearly neutral pH. The SAP incorporated with calcium fertilizer by chemical bond and substrate occlusion. The pores of cross-linked network of WACF are space to storing water. In comparison with the check treatment,WACF can increase volumetric water content of soil by average 14. 0% between tested suction when the ratio of WACF to soil is 1% wt. Also,WACF show better slow-release performance of calcium nutrient which retain calcium nutrient in hydrogel substrate much more time that increase available duration of soluble calcium.

关 键 词：保水钙肥 化学聚合 特征 性能 

分 类 号：S143.72[农业科学—肥料学]