THE PRESENT INVENTION RELATES TO AN IMPROVED HERBICIDAL FORMULATION. MORE SPECIFICALLY, THE PRESENT INVENTION RELATES TO A SOLID HERBICIDE FORMULATION COMPRISING:- (A) AN AGROCHEMICAL HAVING A pKa FROM 2 TO 7 (B) A WATER-SOLUBLE ALUMINIUM SALT (C) A SILICATE MINERAL. THE PRESENT INVENTION FURTHER PROVIDES A METHOD OF CONTROLLING UNDESIRABLE VEGETATION AT A LOCUS-IN PARTICULAR A PADDY FIELD-USING SAID FORMULATION.