... Trait : Black powder, easy dissolve into water Name First Grade Potassium Humate TraitBlack powder, easy dissolve into waterQuality indexHA(dry ... product can improve the potassium content in the soil ., accelerate the release of potassium, increase the absorb of potassium of plant. it can ... soil, stimulate the plant growth, enhance the utilization of the fertilizerpayment:T/T ,D/P,D/A, ...