596533 Disclosed herein is a composition comprising 30-40% (w/w) monoammonium phosphate, 30-40% (w/w) struvite (magnesium ammonium phosphate) and 25-35% (w/w) magnesium sulphate; further including an acidic surfactant (perhaps at 1-4% (w/w)) and a drying agent (perhaps at 1-3% (w/w)), such as a silica-based drying agent; and the use thereof for improving plant growth comprising applying the composition to a seed, prill or fertilizer granule, thereby producing a coated product and applying the coated product to soil comprising at least one growing plant, wherein the composition is applied to the seed, prill or fertiliser granule at 0.1-2.0% (w/w).