施氮量和株行距配置对鲜食糯玉米群体冠层结构和产量的影响

Effects of nitrogen application and row-spacing on canopy structure and yield of fresh waxy maize

采取同一密度不同株行距配置和不同施氮量的试验处理,分析栽培措施和施氮量对糯玉米冠层的SPAD值、叶面积指数(LAI)、光合势、茎叶倾角、叶向值、冠层PAR、冠层开度、产量及产量构成要素的影响。结果表明:在同一密度同一行距条件下,冠层SPAD值、叶向值、PAR随着施氮量增加而增加,各处理间差异显著,而叶倾角随着施氮量增加而减小;不同施氮量对冠层开度影响不大,差异不显著,而对糯玉米产量影响差异显著。在授粉后12～18d,行距70cm,施氮量为N3,叶面积指数达最大,光合势最强,且较其它生育期差异明显。

With the same density, the influences of nitrogen application and row spacing on population canopy SPAD, LAI, photosynthetic power, angle and value of leaves, PAR, DIFN,yield and yield components were analyzed. The results showed that SPAD, value of leaves, PAR increased with the increasing nitrogen application amount in the same density and row spacing, but all treamts were distinctive. Angle of leaves decreased with the increasing fertiliza- tion; the influences of different fertilization amount on DIFN had little effect, and the difference was not significant, but yield of waxy maize was significant. 12-18 d after pollination, LAI was bigger, photosynthetic power was the strongest with the row spacing 70cm and N3 application,and there was obvious differences in other growth periods.