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Esters derived from 1‐naphthylacetic acid (NAA) and polyacrylate were synthesized and a dual controlled‐release formulation was developed by coating fertilizers with these esters. FT‐IR, 1H NMR, TGA, and DSC were used to characterize the synthesized polymers, and the mechanical properties were also tested. Urea granules were coated with NAA esters, and the release rates of urea from the coated granules...