Effect of magnesium on fertilizer-utilized coefficient of nitrogen， phosphorus and potassium as well as grain yield in maize

The application of magnesium (Mg)shows a curved correlativity with the fertilizer-used efficiency of N，P and K．The moderate application of Mg is very conspicuously promotive of maize absorption to N，P，and K．The application of MgO (66．7kg／hm²)in this test，of which the fertilizer utilization coeficient of N，P，and K increases 27．61％，18．03％and 118．73％ respectively than that of the comparison and the yield increases by 6．19％．enhances the contents of protein．1ysine and starch being 3．40％，7．14％，and 17．15％ respectively and reduces the contents of fat and sugar being 2．59％ and 10．86％ respectively．Over fertilizing Mg has a tendency to inhibit the accumulation of N ，P，and K in plant and it is no good for yield．