The results indicated that leonardite leonardite from Mae Moh the value of pH was 6.08-6.82,Which is suitable to plant the most. And the electrical conductivity of Li is at the most is 3.17-4.38 dS/cm. That can help in dissolving nutrients that are beneficial to the plant, but the pH also quite acidic (pH 3.04-5.23) is not appropriate to plant should be improved before use.