玉米施镁对氮磷钾肥料利用率及产量的影响

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

摘要: 玉米施Mg与N、P、K 肥料利用率呈曲线关系，适量施Mg对玉米吸收N、P、K 的促进作用极显著。与仅施N、P、K 肥的对照相比，玉米施用MgO 66．7kg／hm² 可分别提高N、P、K 肥料利用率27．61％、18．03％和118．73％，增产6．19％；分别提高籽粒蛋白质、赖氨酸和淀粉含量3．40％、7．14％和17．15％，降低脂肪及糖分含量2．59％与10．86％，而过量施用Mg有抑制N、P、K在植株体内积累的趋势，对产量无益。

Abstract: 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．