ADVANCE IN POLYMER-COATED CONTROLLED RELEASE FERTILIZERS

Economic and bionomical benefit can be reached through using controlled-release fertilizers.The most important application of controlled-release of fertilizer is polymer-coated fertilizers.The current research and nutrients release model about polymer-coated controlled-release fertilizer are briefly introduced in this paper.The factors that influence the nutrients release behavior are as followings: membrane thickness,granule radius,diffusion coefficient,nutrients composition and nutrient dissolving property.The application of polymer-coated controlled-release fertilizer in our country is in the initial stage,and almost depends on importation,but shows strong application potential in future with the economic development.Some important progress about the research of polymer-coated controlled-release fertilizer has been made in our country.However,there are also some deficiencies in technological,cooperational and market aspects.Therefore,a commercial polymer-coated controlled-release fertilizer with Chinese-owned needs a long time study,especially in the theory research and market development.