【摘要】 为探索晋南地区玉米适宜的栽培品种和种植密度,以‘先玉335’、‘郑单958’和‘浚单20’3个玉米品种为试验材料,设置7个密度处理,4.50、5.25、6.00、6.75、7.50、8.25和9.00万株/hm~2,分析小麦-玉米一年两熟制条件下,不同种植密度对晋南夏玉米茎秆及产量等性状。结果表明:随着玉米种植密度的增加,株高和穗位高均增加,茎粗减小,倒伏率呈现增加趋势。同密度条件下,‘郑单958’的倒伏率低于‘先玉335’和‘浚单20’。‘先玉335’、‘郑单958’和‘浚单20’在种植密度为7.50、8.25和9.00万株/hm~2获得最大产量分别为1 1034、8 668和8 456 kg/hm~2。随着种植密度增加,玉米单位面积穗数增加,而穗长、穗粗、行粒数和百粒重均降低,但对穗行数的影响不显著。综合茎秆性状和产量结果看,‘先玉335’种植密度为6.75～8.25万株/hm~2时,可取得较好生产效益。更多还原

【Abstract】 To explore suitable cultivars and planting density for maize in south of Shanxi Province.Effects of planting density on the stalk characteristics and yield of summer maize cultivar ‘Xianyu 335’,‘Zhengdan 958’ and ‘Xundan 20’ were investigated.The experiment involving 7 planting densities(4.50×10~4,5.25×10~4,6.00×10~4,6.75×10~4,7.50×10~4,8.25×10~4 and 9.0×10~4 plant/hm~2) of maize were conducted.The results showed that:Plant height and ear height increased with the increase of planting density,while the stem diameter decreased and lodging rate increased;Under the same density condition,the lodging rate of ‘Zhengdan 958’ is lower than that of ‘Xianyu 335’ and ‘Xundan 20’.The maximize yield of ‘Xianyu 335’,‘Zhengdan 958’ and ‘Xundan 20’ were 11 034、8 668 and 8 456 kg/hm~2 when the planting densities were 7.50×10~4,8.25×10~4 and 9.00×10~4 plant/hm~2,respectively.With the increase of planting density,the number of ears per unit area increased,while ear length,ear diameter,kernels per row and 100-kenel weight decreased.According to the results of comprehensive traits of stem and yield,the planting density of ‘Xianyu 335’ with the planting density ranged from 6.75 to 8.25×10~4 plant/hm~2 is preferable for maize production.更多还原