中文摘要：

为明确夏玉米生理成熟期子粒含水率及其影响因素,2014-2016年,以郑单958、先玉335等玉米品种为研究对象,分别在北京和河南新乡开展品种比较和播期研究。结果表明：生理成熟期玉米子粒含水率平均27.8%,在品种间存在极显著差异,变幅为21.5%～33.1%,按80%置信区间为24.2%～31.4%;环境条件对子粒达到生理成熟的时间和含水率有极显著影响,且环境和品种之间具有明显的交互作用;生理成熟期子粒含水率高低与授粉到生理成熟经历的天数之间相关度较低。夏玉米区主栽品种郑单958、先玉335、农华101、中单909、京农科728、华美1号和农华816生理成熟期子粒含水率平均值分别为28.4%、24.9%、27.9%、29.1%、28.7%、29.2%和29.9%。

英文摘要：

In order to clarify summer maize kernel moisture content at physiological maturity stage and its influencing factors, experiments of cultivar comparison and sowing date were conducted in Beijing and Xinxiang, Henan in 2014-2016. The results showed that the kernel moisture content at physiological maturity stage was significantly different among cultivars. The average was 27.8%, changing from 21.5% to 33.1%. The 80% confidence interval was 24.2%-31.4%. The environment had significant effect on days from pollination to physiological maturity and the grain moisture content. Environment and cultivar possessed obvious interaction. The correlation between the kernel moisture content and the days from pollination to physiological maturity was lower. The average kernel moisture contents of main cultivars as Zhengdan 958, Xianyu 335, Nonghua 101, Zhongdan 909, Jingnongke 728, Huamei 1 and Nonghua 816 respectively were 28.4%, 24.9%, 27.9%, 29.1%, 28.7%, 29.2% and 29.9% at physiological maturity stage.