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中国农学通报

中国农学通报 ›› 2011, Vol. 27 ›› Issue (33): 85-89.

• 农学 农业基础科学 • 上一篇    下一篇

复合型缓释肥包衣剂理化性质及缓释特性研究

熊海蓉 钟总 官春云 蒋利华 邹应斌 熊远福   

  • 收稿日期:2011-05-24 修回日期:2011-09-15 出版日期:2011-12-25 发布日期:2011-12-25

Studies on Physical and Chemical Properties and Slow- Release Properties of Compound Coating Agent for Slow-Release Fertilizer

  • Received:2011-05-24 Revised:2011-09-15 Online:2011-12-25 Published:2011-12-25

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摘要：

为了探明复合型缓释肥包衣剂的理化性质及其缓释特性，对复合型缓释肥包衣剂的粘度、成膜性、成膜时间、膜韧性、包衣脱落率、包衣肥的养分初期溶出率、养分微分溶出率、养分累积释放曲线等进行了测定。理化性质测试结果显示：缓释肥包衣剂的粘度为44.5 MPa/s、成膜性良好、成膜时间7 min、包衣膜拉长倍数达2.8倍，包衣脱落率< 5%。缓释特性测试结果显示：包衣肥养分N、P、K初期溶解率< 15%、微分溶解率< 2%，符合中国《缓释肥料》标准GB/T23348—2009。其中P的初期溶解率小于N、K的初期溶解率，而N、P、K微分溶解率相差不大。养分累积释放曲线大致呈“S”型，与作物生长需肥规律一致。表明复合型缓释肥包衣剂的理化性质良好，能有效控制普通复合肥养分的缓释。

关键词: 油菜, 油菜, 肥力分级指标, 相对产量, 推荐施肥

Abstract:

To explore the physical and chemical properties and slow-release properties of compound coating-agent for slow-release fertilizer (KSFF-2), the viscosity, forming film property, forming film time, film tenacity, coating off rates of coating agent, and the nutrient initial-release ratios, nutrient micro-release ratios and nutrient accumulation-release curves of coating slow-release fertilizer were determined. Results showed that the viscosity of the compound coating-agent was 44.5 MPa/s, forming film property was better, forming film time was 7 min, film stretch ratio was 2.8 times, coating off rates was less than 5%. The initial release ratio of N, P, K in the coated fertilizer was less than 15%, the micro release ratio was less than 2%, which was consistent with the slow-release fertilizer standard GB/T23348-2009 constituted by China. The initial dissolution rate of P was less than those of N and K, and the micro release ratio of N, P, K was almost the same. The nutrient accumulation-release curves were S-shape, which was consistent with the nutrient demand of crops. These results indicated the physical and chemical properties of compound coating-agent for slow-release fertilizer were good, and it could effectively control the slow-release of nutrients of general compound fertilizer.