PROBLEM TO BE SOLVED: To provide a fertilizer applicator for aquatic plants capable of effectively feeding the fertilizer to the aquatic plants such as seaweeds and the like and provide a method of fertilizer application using the same. SOLUTION: This fertilizer applicator for aquatic plants is prepared by impregnating or mixing fertilizer components in or with the main body 1 of the applicator prepared by hardening calcined gypsum. This method of fertilizer application is to submerge the fertilizer applicator for aquatic plants in water and fertilize the living plants by releasing the fertilizer components depending on dissolution of gypsum.
