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Development of slow-release fertilizers

HAO Wanchen(Department of Chemistry,Weinan Teachers College,Weinan 714000,China)  
The ways for developing slowrelease fertilizers are:①synthesize the slowrelease fertilizers by chemical reaction,such as ureaformaldehyde condensation products;②the granular fertilizers are coated with coating materials to preparing the coated granular fertilizers;③the nitrification inhibitors or urease inhibitors are mixed into fertilizer to manufacturing the slowrelease fertilizers.The utilization factor of the nutrients in slowerlease fertilizer is higher because the dissolved rate of slowrelease fertilizer is slower and the nitrifying decomposition period is longer in the soil.It is the energy saving and enviromental friendly product.
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