高密度对甘肃黄灌区玉米品种农艺性状和产量的影响

选择4个玉米品种,设置3种密度,于2015-2016年在甘肃中部沿黄灌区种植试验得出：同一品种在不同密度下的农艺性状和产量存在差异。对宁玉524、辽单588、高玉818、先玉335的各农艺性状和产量构成因素在密度9.75万、11.25万、12.75万株/hm ²处理下两年测得的数据均值进行了分析比较,发现随着种植密度的增大,玉米的农艺性状和产量出现趋向性变化。表现为玉米的空秆率、倒伏率、株高、穗位高和产量随着密度的增加而增加;茎粗、穗粗、穗长、穗粒数和百粒重随密度增加有所减小。其中空秆率、茎粗、穗粗、穗长、穗粒数和产量差异显著,高种植密度对他们有显著的影响。

Effects of High-Density on Agronomic Traits and Yield of Maize Varieties in Yellow River Irrigation Areas of Gansu Province

An experiment including four maize hybrids,three density, in the middle of Gansu along the Yellow River irrigation for two consecutive years was conducted and difference in agronomic traits and yield of the same maize varieties in different densities was analyzed. The data of agronomic traits and yield from maize varieties Ningyu 524, Liaodan 588, Gaoyu 818, Xianyu 335 measured at the density treatment of 9.75×10 ⁴, 11.25×10 ⁴, and 12.75×10 ⁴ plants/hm ² showed that with the increase of planting density, the barren stem rate, lodging rate, plant height, ear height and yield increased, while the stem diameter, ear diameter, ear length, kernel number per ear and 100-kernel weight decreased. There were significant difference in barren stem rate, stem diameter, ear diameter, ear length, kernel number per ear and yield under LSD_0.05 level, indicaing significant effects of high level planting density on the agronomic traits.