... organic powder, it has good sorption capacity, exchange capacity, complexity and chelation, and it helps to retain soil fertility, organic fertilizer with ... (kg/bag)Potassium HumateBright Black Powder≥40100≤208—10≤258—1025Potassium HumateBright Black Powder≥50100≤208—10≤208—1025 Potassium humate fertilizer prices