Soluble Seaweed Fertilizer (Soluble Seaweed Extract) Organic matter: 50% min. Soluble Pure seaweed extract Component: Seaweed fertilizers is made from fresh seaweed (alga), such as Ascophyllumnodosum, Sargassum, ... crop, vegetable, fruit, horticulture,especially for organic and non-polluting, green farming and applicationsincluding field ... cropquality and increase yield. Soluble Seaweed Fertilizer