中文摘要：

为探讨如何进一步提高玉米产量,改进冀中南夏玉米杂交种模式,以该区域玉米主栽品种郑单958和先玉335多年产量变化为依据,对2类杂优模式进行了研究。结果表明：一般中低产年份郑单958产量〉先玉335,而高产年份则是先玉335产量〉郑单958;先玉335和郑单958产量与穗行数相关性均较小,与行粒数和千粒重相关性均较大,其中先玉335产量与行粒数相关性最大,而郑单958产量与千粒重相关性最大。两大玉米杂交种模式在冀中南地区均存在改进空间,其中提高郑单958模式的产量潜力,或创新类似模式是当前冀中南区域玉米育种的一个重要方向。

英文摘要：

In order to explore how to improve the yield of maize, in the middle and south of Hebei Province, based on the yield c and to improve the hangesofZhengdan hybrid model of summer maize 958 and Xianyu 335 in recent years, 2 heterosis model were studied. The results showed that yields of Zhengdan 958 was higher than that of Xianyu 335 during most of common years. Meanwhile, yields of Xianyu 335 was very obviously higher than that of Zhengdan 958 during rarely high yields level years. The yields of Zhengdan 958 and Xianyu 335 had little correlation with ear row number, and they all had greater correlation with grain number per row and 1 000 grain weight. Based on these, there were improved space for two main model. To refine Zhengdan 958 model by increase its yields potential was a more important breeding way in middle and south of Hebei Province.