Screening of Super-high-yielding Varieties and Study on Population Quality Indices of Winter Wheat in Southwest Shandong Province

The large-spike type,more-spike type and middle-spike type of winter wheat varieties were used to screen the suitable varieties for large-scale cultivation with 9 750 kg/hm2 of super-high yield in southwest Shandong Province.Based on their yields,the more-spike type varieties Jimai 22 and Taishan 23 were selected.The dynamic variation of the wheat populations were also analyzed systematically in this paper.Then the population quality indices for more-spike type wheat to obtain 9 750 kg/hm2 of yield were summarized as 7 200 thousand mature spikes per hectare,45% of effective tillers at jointing stage,40 grains per spike,38 g of 1 000-grain weight,8.6 of the peak leaf area index,75% of high-effective leaf area and over 95% of effective leaf area.