为充分挖掘山西晋南地区旱地玉米生产潜力，找出适宜本地区玉米高产的关键栽培技术措施，采用裂区试验设计，研究了不同播期（4/17、4/27和5/7）和种植密度（5.25、6.00、6.75和7.50万株/hm2）对玉米品种（先玉335和强盛388）生长发育及产量的影响。结果表明：随种植密度增加植株株高和穗位高升高，茎粗和单株干物质重降低，播期推迟使这种增加和降低效应进一步加强。亩产量在密度间的变化根据玉米品种不同而异，但整体均表现为晚播处理亩产量较低，中播处理较高。随着播期的提前，玉米生育期也相应延长，生育期延长的影响主要表现在播种至拔节期。先玉335在早播和中播条件下适宜密度为6.75万株/hm2，晚播条件下适宜低密度种植，强盛388在3个播期下均适宜低密度种植。综合来讲该区生态因素，本地区旱地玉米最佳播期在4月27号左右，适宜播种密度为为6.75万株/hm2左右，玉米茎杆性状及产量指标较优。
英文摘要:
To exploit potential production and appropriate cultivation techniques for dryland maize in shanxi province, field experiment was conducted to study sowing date (4/17, 4/27 and 5/7) and planting density (5.25, 6.00, 6.75, and 7.50×104 plants/hm2) effects on maize varieties (Xianyu335 and Qiangsheng388) growth and yield using split plot experiment design. The results showed that plant height and ear height increased, stem diameter and plant dry matter weight decreased with the increase of planting density, and the sowing date promoted this increase and decrease effect further. Area yield change in density varied according to different maize varieties, but area yield was lowest under late sowing and highest under middle sowing. As the sowing date in advance, maize growth period is extended accordingly, especially on the growth period of sowing to jointing stage. The suitable density of Xianyu335 was 6.75×104 plants/hm-2 in early sowing and middle sowing date, while lower planting density was suitable for yield increase under late sowing conditions. Low density cultivation were suitable for Qiangsheng388 under the three sowing date. In general, the region\&\#39\;s suitable sowing date was April 27 with a suitable planting density of 6.75×104 plants/hm2 for dryland maize, which had a better corn stem traits and yield index.
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