宁南旱作区不同区域冬小麦品种(系)灰色关联度分析OA

In order to screen out suitable winter wheat varieties for promotion and cultivation in the dry farming and rain-fed area of southern Ningxia,the grey system theory was used to conduct a comprehensive evaluation of 7 winter wheat varieties(lines)at 2 experimental sites in the southern Ningxia rainfed farming area,and the grey correlation degree between the winter wheat yield and 7 agronomic traits were studied.The results showed that the weights of each agronomic trait on the increase of the yield were in the following order:number of grains per spike,thousand-grain weight,length of the spike below the spikelet,number of fertile spikelets,spike length,single plant biological yield,and effective tillers.As for the equal-weight correlation degree of the tested varieties(lines)at the Pengyang County experimental site,that of'Longyu No.1'was the highest,followed by that of'Longjian 103',and that of'Ningdong No.16'ranked the fourth.At the Yuanzhou District experimental site,'Longyu 0825'had the highest correlation degree,followed by'Longyu No.1'and'Ningdong No.16',ranking fourth.The average value of the comprehensive evaluation of the two experimental sites was the largest for'Longyu No.1',followed by'Longjian 103','Longyu 0825','Longzhong No.1',and'Ningdong No.16',with average yields of 5 975,4 682,4 470,3 682,and 4 629 kg·hm-2 respectively.In conclusion,winter wheat yield is most affected by the number of grains per spike and thousand-grain weight,and as for the comprehensive performance of the tested varieties(lines),the'Long'series is most outstanding,followed by the'Ningdong'series.Among them,the comprehensive performance of'Longyu No.1'and'Longjian 103'is the best,followed by'Ningdong No.16'.