为了探讨黄淮海地区夏玉米生长发育和产量形成对播期的响应，本试验以黄淮海地区18个主栽品种为材料，进行3个播期处理，播期分别为：6月3日（T1）、6月13日（T2）、6月23日（T3）。结果显示，随着播期的推迟，夏玉米生育期缩短，株高、穗位、穗三叶叶面积和单株干物重均呈降低趋势。不同玉米品种的百粒重和穗粒数随播期的推迟而降低，产量下降。不同播期条件下各种指标变动小的品种适应性强，适播期长，这些品种通过保持相对稳定的生育期、较大的光合叶面积，从而保证了较高的干物质积累，最终获得较稳定的产量。因此，适时早播有利于提高产量；在无法满足早播时，可以选择抗逆性强、适播期较长的联创825或产量优势强的迪卡653等品种，以避免高温或晚播造成的减产。
英文摘要:
To explore the response of growth, development and yield of summer maize to sowing date in Huang-Huai-Hai Plain (HHH), three sowing date treatments (June 3, 13 June, 23 June) were conducted with 18 main cultivars in HHH. The results showed that the growth period of maize varieties was shortened, plant height, ear position, leaf area and dry weight per plant decreased significantly with the delay of sowing date. The 100-grain weight, the number of grains per ear and the yield decreased with the delay of sowing date. Under different sowing date conditions, varieties with small changes in various indexes have strong adaptability and long suitable sowing time. And those varieties maintained a relatively stable growth period and larger leaf area to ensure higher dry matter accumulation and stable yield. Therefore, early sowing is beneficial to improve the maize yield, but when early sowing can not be satisfied, the varieties with long suitable sowing period such as Lianchuang 825 or strong yield advantage such as Dika 653 can be selected to prevent the yield reduction caused by high temperature or late sowing.
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