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Seaweed extract fertilizer contains rich polysaccharide, fucoxanthin, ocean active ingredients and microelement (magnesium, potassium, zinc, iron). As a water soluble organic fertilizer, it wide use in agriculture and garden fields. Seaweed contains nutrients and trace elements, which enhance the plant growth. It can be utilized as foliar spray or for direct application to the soil as biofertilizer. The seaweed is extracted with water and then with alkali under specific temperature and pressure. The extract is filtered and concentrated from marine brown algae.