... 30%. 3.lowest price but high quality Seaweed Extract Flake Organic Fertilizer 1.Improve crops quality,enhance resistance of crops. 2 ... 20% to 30% Product Name: Seaweed Extract Flake Organic FertilizerProduct Character:Black brown Flake, water soluble, pH=6-8Main Ingredient:1.Aliginate ... %,P2O5>1.5%,K20>13%,Mannitol>0.5%,I:720ppm,Organic Matter>45%,Moisture<4%2.Aliginate>18%,N>1%,P2O5 ...