播期对山西省春玉米生长发育及产量的影响

2012年在山西省忻州市进行了春玉米4个播期试验,探讨播期对山西春玉米生长发育和产量形成的影响。结果表明,播期对春玉米生长发育及产量形成均有显著影响。随播期推迟,春玉米生育期缩短,灌浆持续时间延长,籽粒干质量随播期的推迟而减少。播期对产量影响显著,随播期的推迟呈现先升高后降低的趋势;播期、千粒质量和秃尖长度对产量起主要作用,千粒质量与产量呈显著正相关(r=0.937 2)。4月25日左右播种玉米,花后光照充足,穗粒数形成较多,灌浆期雨热同季,适合籽粒灌浆,产量最高。

Influence of Sowing Date on Growth and Yield of Spring Maize in Shanxi Province

The study of four sowing date treatments of spring maize was conducted to investigate the influence of sowing date on growth and yield of spring maize in Shanxi in Xinzhou Shanxi province in 2012. The results showed that the sowing date had a significant impact on the growth and yield of spring maize. When the sowing date delayed, the growth period of spring maize tended to shorten, the filling duration showed prolonged and the seed dry matter decreased. The effect of sowing date on maize yield was significantly within the range of sowing date, which increased firstly and decreased later as the sowing dates postponed. The sowing date, thousand seed weight and bare tip length played an important role on yield. The thousand seed weight and the yield showed very notable positive correlation （r = 0.937 2）. According to the test results, the maize had the highest yield for seeding sown around April 25, because of plentiful sunshine after flowering, more grain numbers per spike, and heat and rainfall in the same quarter at filling stage which is good for grain filling.