Bioactive acid agrichemical compositions and use thereof

A flowable bioactive agrichemical composition in particle form comprising a bioactive acid composition comprising either a) solid carrier particles which have been treated with a bioactive acid solution having a pH of less than 6 and comprising an acid and at least one antimicrobial metal ion source said acid present in a molar excess, relative to the antimicrobial metal ions, and the concentration of antimicrobial metal ion in the acid solution is from about 1 ppm to about 500 ppm in the case of a single antimicrobial metal ion or from about 2 to about 1000 ppm in the case of multiple antimicrobial metal ions or b) a combination of at least one antimicrobial metal ion source and an acid, wherein the composition has a pH of less than 6, the acid is present in a molar excess to the antimicrobial metal ions of the source, and the concentration of antimicrobial metal ion is from about 1 ppm to about 500 ppm in the case of a single antimicrobial metal ion or from about 2 to about 1000 ppm in the case of multiple antimicrobial metal ions