高产高淀粉玉米新品种郑单21生态适应性研究

通过播期试验，研究了不同生态条件对高淀粉玉米品种郑单21的生长发育和产量的影响。结果表明，在河南夏播条件下，随着播期的推迟，郑单21的产量逐渐下降，穗行数、行粒数和千粒重均逐渐降低，生育进程加快，叶面积系数最大值、干物质积累量逐渐减小，但6月15日以前播种的差异不大。适宜生态条件为：全生育期积温2596.2~2764.5℃，至2311.7℃产量严重下降；全生育期日均温度为23.2~24.0℃，至22.7℃产量严重下降；全生育期光照514.9~603.2h，至436.7h产量严重下降；全生育期日均光照为4.6~5.2h；至4.3h产量严重下降。

Study on Ecological Adaptability for Zhengdan 21 with High Yield and High Starch Corn Variety

The influence of different ecological condition on growth and yield of corn variety Zhengdan 21 was studied through sowing-date experiment at Ayang city. The yield, ear row number, and row grain number dropped, the growing process quickened , the maximum leaf area index and dry matter accumulation declined, along with the postponement of summer sowing, The ecological adaptability for high yield of Zhengdan 21 was that whole growing accumulated temperature was 2596.2~2764.5℃ and whole growing daily mean temperature was 23.2~24.0℃, whole growing accumulated sunshine hour was 514.9~603.2h and whole growing daily mean sunshine hour was 4.6~5.3h.