it mainly used on the spraying for the plants leaves.seaweed fertilizer is an efficient green and new type of fertilizer.the main raw materials,which consist of plentiful nutriments and some special biochemical components, are economic algae in the sea.there is no poisonous, harmlesss,no pollution. it can be applicable to wide use.it can meliorate resistance of plants to stress,such as cold, disease,raise the yield and and improve the quality of plannts. email:watson.seaweed#sodiumalginate#cn msn:wxbwatson#hotmail#com#cn