玉米施镁对氮磷钾肥料利用率及产量的影响

玉米施Mg与N、P、K肥料利用率呈曲线共系,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/hm~2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。

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 (66.7 kg/hm2) in this test,of which the fertilizer utilization coefficient 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,lysine 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.