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《Journal of Zhejiang University of Technology》 2006-04
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Preliminary study on features of controlled release of bentonite-coated compound fertilizers

PAN Yan-feng,XIE Hua-li,ZHOU Chun-hui,LI Jie,GE Zhong-hua,LI Xiao-nian(College of Chemical Engineering & Materials Science,Zhejiang University Of Technology,Hangzhou 310032,China)  
Using natural Na-bentonite minerals and conventional fertilizers to produce the controlled-release compound fertilizer is of great significance in the field of agriculture and environment preservation.Here Nabentonite was used as wrapping reagent,and tetraethyl orthosilicate(TEOS) as adhesive to link layers of bentonite,and thus the compound fertilizers of bentonite-coated nitrogenous,phosphate and potassium fertilizers were prepared in different dispersants.The controlled release property was tested and analyzed by means of drop-leaching experiment.The results show that the Na-bentonite exhibits slowly releasing effect for the soluble N and K fertilizers,and the effect can be improved by the increase of the bentonite content.However,the Na-bentonite promotes the release of insoluble P fertilizer.The infrared spectra(IR) measurements reveal that the coating of Na-bentonite on fertilizers is a physical process without destroying the chemical structure of the fertilizers.
【Fund】: 浙江省科技计划项目(2005C32006);; 浙江省教育厅项目(20040567)
【CateGory Index】: TQ440.1
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