不同玉米品种耐密性比较

采用5个玉米品种材料,设置9个密度梯度,分别测定各密度处理下的单株产量和茎秆外皮穿刺强度,比较不同品种的耐密性。结果表明,各品种的单株生产力(单株穗粒干重)随密度的逐渐增大均呈二次曲线的变化规律,且拟合度均达0.932 4以上;多密度处理下的玉米单株产量偏高,但随密度的变化趋势和常规小区保持一致,能准确检测玉米品种耐密性大小;玉米各品种的第3节茎秆外皮穿刺强度均表现为随密度增加而逐渐下降,超试1号的穿刺强度在各密度下明显高于其他品种,郑单958随密度变化不大。耐密性筛选结果表明,超试1号、郑单958的耐密性明显优于中单808、京科518;中试839的耐密性适中。

Comparisons on the Density-tolerance of Different Maize Varieties

This experiment used five varieties maize materials and set nine density gradients in order to analyze the density-tolerance among different varieties of maize through measuring single plant production and rind penetration strength in different treatments. The result showed that single plant production with the row-spacing larger came on the gradual change in the law of quadratic curve, and the goodness of fit were up of an average of 0.9324. High-density production of plant productivity that was possible within the ambit of the spacing in the rows was the dry weight of ear per plant. Both could be quantitative to distinguish the density-tolerance of different maize. Although the single plant production was common on the high side under multidimensional treatments, the variation trend kept consistent with densities change, which could also test the density-tolerance exactly. The rind penetration strength of the third joint in every variety declined gradually with density increases. Screening test results showed that Chaoshi1hao and Zhengdan958 were superior than Zhongdan808 and Jingke518; Zhongshi839 was in the middle of them.