To provide a fertilizer for a crop such as a wheat and a corn in which efficiency of silicate absorption and yield are increased, an amount of fertilizer and fertilizing labor are decreased and quality is improved.

SiO2 in the fertilizer for a wheat and a corn of ≥50% elutes in a 4 mass% citric buffer solution (initial pH 5.5). The fertilizer whose main component are MgO, SiO2 and CaO contains MgO of 1-20 mass% and SiO2 of 30-50 mass%, preferably P2O5 1-12 mass% and is an amorphous inorganic composition.