MANUFACTURING METHOD OF FERTILIZER WHOSE EFFECTIVENESS LASTS LONG

摘要

The granular fertilizer is prepd. by i) mixing 30˜100 wt.% rosin and 0˜70 wt.% rosin derivative, ii) adding 0˜20 wt.% polymer into the obtd. mixt., and dissolving in the organic solvent to obtain the basic coating material contg. 0.5˜50 wt.% polymer, iii) basic-coating granular fertilizer with 2˜40 wt.% obtd. basic coating material, and iv) protective-coating the basic coated granular fertilizer with 0.2˜30 wt.% organic soln. or emulsified soln. contg. 0.5˜50 wt.% organic solvent.