potassium humate good price, good service, good payment, delivery time immediate The Pot. Humate we produced has Gruanle and Powder two types. ... Shining black column Diameter: 3mm, Length: 2-5mm Water-solubility (dry base): 100% Humic acid (dry base): 60% Potassium content (K2O ... 3)Application 1. Used as organic potash fertilizer. Using potassium humate solution to spray, seed soak, dip root or apply ...