Abstract: The present invention relates to a polymer emulsion coating agent, a coating controlled-release fertilizer containing said coating agent, and the method for producing the same. The polymer emulsion coating agent of present invention contains alkyd resin prepolymer with neutralization. The present invention also relates to a coating controlled-release fertilizer, which comprises a fertilizer core and a coating applied thereon, wherein said coating comprises the polymer film containing the polymer emulsion coating agent and optionally the inorganic layer containing inorganic powder outside of the polymer film.

Abstract: The invention relates to a water-soluble alkyd-sulfur composite coated controlled-release fertilizer and method of preparing the same. The coated controlled-release fertilizer comprising a fertilizer core and a coating applied thereon, wherein said coating comprises a sulfur film and a polymer film comprising a coating agent of water-soluble alkyd outside the sulfur film, and optionally an inorganic layer comprising inorganic powder outside the polymer film.