不同生态区及播期对玉米籽粒灌浆的影响

Ecological and Sowing Date Effects on Maize Grain Filling

以山东品种掖单 2 2和新疆品种Sc70 4分别在新疆石河子和山东泰安两个生态区 ,分三个时期播种 (2 0 0 0年 4月10日、5月 10日和 6月 10日 ) ,以研究生态区及播期对籽粒灌浆的影响。结果表明 ,在不同的生态区 ,分期播种对籽粒灌浆的影响不同。在新疆石河子地区 ,随着播种期的推迟 ,玉米籽粒灌浆的进程变慢 ,持续时间延长 ,灌浆速率下降 ,粒重减轻。在山东泰安 ,播期对粒重的影响不大。

Two maize hybrids (Yedan-22, Sc704) were planted in two ecological regions, Shihezi of Xinjiang(45.3°N, 86°E) and Tai'an of Shandong(36.16°N,117.6°E), with three sowing dates (April 10, May 10 and June 10 in 2000), in order to study the effects of ecology and sowing date on grain filling. The results showed that the influence of sowing date on grain filling was different between ecological regions. In Shihezi region, a lagged grain filling, a slower filling rate and a lighter grain weight was found in late sowed maize. However, the effect of sowing date on grain weight was not significant in Tai'an. The main reason of this discrepancy was the difference in day length and temperature during grain filling due to latitude.