| abstract |
(57) [Abstract] [Problem] To provide a fertilizer with a good mineral balance using seawater as a raw material. [MEANS FOR SOLVING PROBLEMS] A method for producing a mineral fertilizer using seawater as a raw material, comprising a step of performing a treatment for selectively removing at least Na, Ca, and K from seawater. The seawater is preferably deep ocean water. At least N from seawater The step of selectively removing a, Ca, and K is realized by an electrolysis method or an evaporative concentration method. |