... grade, refined from natural seaweed . Seaweed organic fertilizer (granular)Seaweed organic fertilizer is produced by seaweed residue with ... , fucoidin, and also it contains some natural growth regulating substances, such as cytokinin, gibberellin, mannitol, betaine, polyphenols, ... kind of seaweed fertilizer is good for increasing soil organic matter, improving soil structure, enhancing abilities of ...