3.Nitrohumic acid, ammonium humate:
Black particles or powder, the nitrification or ammonification products of humic acid, can be used as soil improver or irrigation products directly.
4. Potassium fulvic acid:
Black powder, a small part of extract of potassium humate, is a good raw material for water-soluble fertilizer containing humic acid, with good water solubility and strong resistance to hard water. It is a high-quality raw material for the production of water-soluble fertilizer for agriculture.