Method for preparation of coated release-controlled granular fertilizer

Abstract

The invention discloses a preparing method of integument controlled release grain fertilizer, which comprises the following steps: blending 2-4 kinds of organic composition to form mixing solution; adding filming activist and filming accelerant to form film mixing liquid; spraying 1-20% film mixing liquid on the grain fertilizer surface evenly under -20-50 deg.c; forming integument on the surface of grain surface after 2-120 min.

Description

technical field

[0001] The invention relates to the field of coated controlled-release fertilizers, in particular to a preparation method of coated controlled-release granular fertilizers. Background technique

[0002] In order to improve the utilization rate of soluble chemical fertilizers and reduce the pollution of the atmosphere, soil, groundwater, rivers and lakes due to the use of chemical fertilizers, the controlled release technology of fertilizers has been actively researched and developed in recent decades. Applying the coating of chemical fertilizer granules to form coated controlled-release fertilizer is the most studied technology. It is expected to achieve the goal of achieving the goal of fertilizer production by selecting the coating material, controlling the thickness, porosity, degradation rate and particle size of the coating film, etc. The purpose of the release rate is comparable to the absorption rate of the plant. So far, due to the cost of raw materi...