Synthesis process of encapsulating solution which prepared by modified starch and polyvinyl alcohol for slow-release compound fertilizers was researched.The optimal conditions are as follows; solids content of this type of encapsulating solution is 10%, the mass ratio of cross-linking agent to encapsulating solution is 6%,and the mass ratio of solvent to encapsulating solution is 4%.The slow-re-lease compound fertilizers that prepared by diammonium phosphate using 6% encapsulating solution have the characteristics of good release performance,low product cost,biodegradable and environmental friendly encapsulated material.%研究了以改性淀粉与聚乙烯醇(PVA)为原料制备缓释复合肥料包膜料液的合成工艺,探索出其最佳配方:该料液w(固体)≈10％,m(交联剂)∶m(包膜料液)=6％,m(溶剂)∶(包膜料液)=4％.用m(包膜料液)∶m(磷酸二铵)=6％包涂磷酸二铵制备的缓释复合肥料缓释性能良好,生产成本低廉,包膜材料可生物降解,环境污染小.
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