seaweed extract flake 100%water soluable organic fertilizer IMO ISO9001 cert Alga21ST Seaweed Extract FlakeChina patent no.: 03112663.6 Product character:Black or brown flake, water soluble, pH=8-10Main ingredient: Alginic Acid: 8-15%, organic matter≥50%, N≥0.5%, P2O5≥3.0%, K2O:18-22%, much secondary element and microelements, cytokinin, betaine, vitamine, trehalase, amino acid.Efficacy: Improve ...