不同氮水平下超高产玉米品种的产量性状分析

Correlation Analyses on Yield Traits of Maize Hybrids with High Yield Potential at Different Nitrogen Levels

采用相关分析、通径分析方法对8个超高产玉米杂交种穗部性状与产量的关系进行了分析,结果表明,在高氮条件下(474kg/hm2),穗部各性状对玉米产量的作用依次为行粒数>百粒重>穗行数,保证吐丝期具有较高的生物量和叶绿素含量。在低氮条件下,应注重选育穗粒数多、百粒重大、吐丝期叶绿素和灌浆期生物量高的耐低氮品种(郑单958)。金山27和先玉335是高氮高效型品种,高氮水平下金山27产量较低氮水平下高68.18%,先玉335产量在高氮水平下比低氮水平增加90.40%,可在高氮水平下加以利用,郑单958在低氮水平下产量高于高氮水平,是低氮高效型品种。

The correlation analysis and path analysis were used to study the relations between ear traits and yield per plant of 8 maize hybrids with supper-high-yield potential. The results showed that the order of contribution to grain yield was as follows, grain number per row〉 100-grain weight〉ear row number in high nitrogen condition,while the high biomass and high leaf chloro- phyll content at spinning stage should be maintained. In low-nitrogen condition, the hybrids toler- ant to low-nitrogen level such as Zhengdan 958 should be taken into consideration, which had more grains per spike,high 100-grain weight,high leaf chlorophyll content at spinning stage and high biomass at filling stage. The results also showed that Jinshan 27 and Xianyu 335 belonged to high-efficient hybrids at high N level and should be grown in the high nitrogen condition,while Zhengdan 958 is a high-efficient hybrid in low N condition.