PURPOSE: To obtain a granular composition of agricultural chemical preventing solidification of active ingredient by dissolving an active ingredient of agricultural chemical solid at normal temperature optionally containing another active ingredient of agricultural chemical solid or liquid at normal temperature in an organic solvent and impregnating the solution into calcined diatomaceous earth granule having specific oil absorbing ability.

CONSTITUTION: An active ingredient of agricultural chemical solid at normal temperature or a mixture of the active ingredient and one or more active ingredients such as 3'-isopropoxy-α,α,α-trifluoro-o-toluanilide of agricultural chemical solid or liquid at normal temperature is dissolved in an organic solvent to give a solution, which is impregnated into calcined diatomaceous earth granule which is obtained by granulating calcined diatomaceous earth granule having 40-100ml/100g oil absorbing ability, preferably a granular base containing ≥95% diatomaceous earth powder having 300μm-1,4mm particle diameter and calcining the granule at 600-1,100°C in the ratio of 2-80 pts.wt. of the solution based on 100 pts.wt. of the calcined diatomaceous earth granule to prevent the solidification of a granular composition of agricultural chemical containing an active ingredient of agricultural chemical having a relatively low melting point solid at normal temperature.