减源对超高产夏玉米物质积累及氮素利用的影响

Effects of Leaf-cutting on Matter Accumulation and Nitrogen Utilization of Super-high-yielding Summer Maize

通过不同减源处理,研究了在超高产条件下减源对夏玉米物质积累和氮素利用的影响。结果表明:在超高产条件下剪叶1/4和1/2后地上部生物量和籽粒产量未出现显著性下降;减源后玉米植株对氮素的积累量增加;超高产条件下剪叶1/4和1/2都可以提高氮素收获指数,且随剪叶程度加大,氮素收获指数呈现升高的趋势。选育高产条件下叶面积相对小的高产夏玉米品种,是解决高产条件下氮素利用率低的有效途径。

The effects of different leaf - cutting treatments on the matter accumulation and nitrogen utilization of the super - high - yielding summer maize were studied. The results showed that under the condition of super high yield, the above - ground biomass and the grain yield did not reduce significantly after cutting 1/4 and 1/2 of the leaf. The nitrogen accumulation of maize plants increased after leaf - cutting. The treatments of cutting 1/4 or 1/2 leaf could improve the nitrogen harvest index; with the increase of leaf cutting, the nitrogen harvest index showed the increase trend. So breeding the maize variety with smaller leaf area was an effective way to solve the low nitrogen utilization under the condition of super high yield.