密度对夏玉米品种光合特性和产量性状的影响

对不同密度条件下不同株型6个夏玉米品种进行了研究,筛选具有超高产潜力的优势品种。结果表明,对于不同株型品种,光合速率均是低密度处理高于高密度,其中紧凑型品种CF008光合速率最高。从产量性状分析,CF008产量最高,郑单958其次;CF008不同密度之间差异不显著;郑单958低密度产量显著高于高密度。同样,CF008经济系数最高,郑单958、金海5号和鲁单6003依次降低,不同密度间差异不显著。说明紧凑型品种的表现明显好于半紧凑型品种。

Effects of Plant Density on Photosynthetic Character and Yield Trait in Summer Corn

Under different density conditions, different plant shape summer corn cultivars were studied aiming to choose preponderant cultivars which had high yield potential. The results showed that comparing low-density conditions corn leaf area index(LAI) was higher than high-density. The rate of photosynthesis was higher than low density conditions and the rate of photosynthesis of CF008 was the highest in all cultivars. Grain yield of CF008 was the highest and the difference was no significant between high-density and low-density, while yield of Zhengdan958 was higher under low-density conditions, which showed that CF008 could density-resistant higher than Zhengdan958. Similarly, the harvest index of CF008 was the highest and the difference was no significant in different density conditions. In a word, compact type cultivars were better than those of half compact type cultivars and CF008 was slightly better than ZhengDan 958.