PROBLEM TO BE SOLVED: To provide a marine fertilizing material obtained from an N-containing waste solution and a method of producing the same capable of suppressing an oligotrophic issue, especially decolorization of laver, and further a method of producing a fertilizing material that satisfies emission standards of harmful substances such as heavy metal and is liquid, solid, gel, or powder according to a fertilizing method, to maintain fertilization effects in the sea.SOLUTION: A method of producing a fertilizing material typically uses as a raw material an N-containing waste solution discharged in extraction of valuable metal, cleaning of semiconductor manufacturing equipment, or the like.SELECTED DRAWING: None
