Disclosed is a soil treatment composition for use as a fertiliser, said composition including at least one soil treatment component, said soil treatment component including finely ground particulate reactive phosphate rock (RPR), said RPR being finely ground to include particles of less than 45 microns and particles of between 45 microns to 200 microns； and said soil treatment composition characterised by said composition including at least one other agent, said at least one other agent including Muriate of Potash (MOP) intimately combined with said RPR. Also disclosed is a method for preparing a soild treatment composition comprising RPR and MOP.
