Process for the prepartion of membrane-coated fertilizer granules.

摘要

Described is a process for the manufacture of membranecovered fertilizer granules by coating the granules with films of a mixture of a polyisocyanate and a polyol, the coating compound being applied in proportions such that each film has a thickness of 10 to 30 .mu.m, preferably 15 to 20 .mu.m. The granular fertilizer manufactured in this way has the advantage that it initially emphasizes nitrogen release and subsequently potassium release.