Potassium humates were successful extracted from Leonardite by 0.3 M KOH. Based on the results revealed that optimum conditions for potassium humates preparation was: extraction at room temperature (25 cl, at pH 12_5-13.0 for 4 hours. The supematant solution was separated and acldification of the supematant with 0.1 M HCl (pH=2.0-.5) and left stand for 4 hours thereby precipitating the humic salts as a solid precipitation. some metals of K-humate for the extracted was decrease. Herein, K-humate could be used as natural fertilizer and soil conditioner to remediate soil structre and to improve
plant growth.