Selection of Winter Wheat Cultivars with 9750 kg/hm~2 Grain Yield and Study on Their Community Indices in Jiaodong Peninsula

The experiment was conducted to invest yield components of three type wheat cultivars,large-spike type,multi-spike type and mid-spike type,in order to find super-high-yield wheat cultivars with 9750 kg/hm2 grain yield planted in large areas in Jiaodong peninsula.The results showed that large-spike wheat cultivars were the best,such as Yannong 24 and Yan2070.Community dynamic characters of three type wheat cultivars were analyzed systematically.The community indices of large-spike wheat cultivars with 9750 kg/hm2 grain yield planted in Jiaodong peninsula were spikes per hectare 720×104,ear-bearing rate of tillering at jointing stage 45%,grain number per spike 40,1000-grain weight 38 g,the highest leaf area index 8.6,high-available leaf area rate 75%,effective leaf area rate over 95%.