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    陈强, 吕伟娇, 吴建宏, 张文清, 邓修. 水分对壳聚糖包膜尿素养分释放特性的影响[J]. 华东理工大学学报(自然科学版), 2005, (6): 760-763.
    引用本文: 陈强, 吕伟娇, 吴建宏, 张文清, 邓修. 水分对壳聚糖包膜尿素养分释放特性的影响[J]. 华东理工大学学报(自然科学版), 2005, (6): 760-763.
    CHEN Qiang, LU Wei-jiao, WU Jian-hong, ZHANG Wen-qing , DENG Xiu. Effect of Water Vapor Pressure and Soil Moisture on Nutrient Release Characteristic of Chitosan Coated Urea[J]. Journal of East China University of Science and Technology, 2005, (6): 760-763.
    Citation: CHEN Qiang, LU Wei-jiao, WU Jian-hong, ZHANG Wen-qing , DENG Xiu. Effect of Water Vapor Pressure and Soil Moisture on Nutrient Release Characteristic of Chitosan Coated Urea[J]. Journal of East China University of Science and Technology, 2005, (6): 760-763.

    水分对壳聚糖包膜尿素养分释放特性的影响

    Effect of Water Vapor Pressure and Soil Moisture on Nutrient Release Characteristic of Chitosan Coated Urea

    • 摘要: 探讨了土壤中水分对壳聚糖包膜尿素(CCU)养分释放特性的影响。结果表明:CCU具有很好的缓释效果,养分释放率与包膜内水蒸气压差呈线性关系;介质离子浓度对养分释放有很大的影响,在盐类饱和溶液中,最大释放率达不到100%。CCU的养分释放是单个颗粒在不同时间内释放养分的累积行为,单个颗粒不能提供满足要求的持续的养分释放。CCU养分释放速率随着土壤水分的增加而增大,土壤水分含量对CCU养分释放的影响是非常复杂的,养分释放不能简单地用饱和水分条件下的模型来预测。CCU在干旱的土壤中表现出优于聚合物包膜肥料的养分释放特性。

       

      Abstract: Experiments for nutrient release of chitosan coated urea(CCU) were carried out to elucidate the effect of moisture on nutrient release characteristic of CCU.Results showed that,CCU is a good slow-release fertilizer.The nutrient release is linearly related to the water vapor pressure and depends on the ion concentration of liquid medium.The cumulative nutrient release can not reach 100% in the saturated salt solution.The release of CCU is attributed to the cumulative effect of particles that each release(nutrient) individually at a different time,since individual granule is unable to release urea sufficient for the demand.Increasing the water capacity of soils leads to the increase of the nutrient release rate.The effect of soil moisture on the CCU nutrient release is very complex, and could not be forecast by the model developed on the basis of the experimental results in water saturation.In drought soil,CCU has a better nutrient release characteristic than polymer coated urea.

       

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