| In order to provide suitable soybean accessions in southern Huang-Huai,153 soybean yield data and yield related traits data from the Shandong, Henan and Anhui et al provinces was collected, and the key yield limiting factors in different test loci were determined with stepwise multiple regression analysis. Meanwhile, protein and fat contents of some samples collected in 2010-2012 were examined by using near-infrared spectrometer.The main results were as follows:1. Yield. The average yield showed:soybean yield was the highest in Jining test point (2810.26 kg · hm-2), the second highest in the Xuzhou (2662.74 kg· hm-2), followed Suzhou (2506.86 kg·hm-2), Fuyang (2497.49 kg·hm-2), Longkang (2451.92 kg · hm-2), and the lowest in the Shangqiu (2355.72 kg · hm-2). According to the range of yield, the average and the highest yield of Jining point was the highest in all 6 test loci. Longkang test point were maximum (25.89%) based on the C.V, the second maximum were Jining point (23.07%).2. Protein, fat content and protein+fat. The order of protein content of samples from different test loci was Jining (highest,43.76%), Shangqiu point (43.25%), Xuzhou point (43.16%), Suzhou point (43.03%), Fuyang point (42.43%) and Longkang (smallest, 42.34%), arrange of C.V from maximum to minimum was Longkang, Xuzhou, Fuyang, Shangqiu, Jining and Suzhou test point. The high protein (protein?45%) accessions were found in all 6 test loci and the protein content of Zhonghuang48 (47.00%) was the highest in Xuzhou point. The results indicted that 10 soybean cultivars were high protein account for 23.81% in the Jining point.The fat content was highest in Suzhou point (21.35%), middle in Fuyang (21.27%), Longkang (21.15%), Xuzhou (21.13%) and Shangqiu (20.85%), and lowest in Jining test point (20.39%), the range of C.V from biggest to smallest was Jining, Shangqiu, Xuzhou, Longkang, Fuyang and Suzhou. The high fat (fat?22%) accessions were found in 5 test loci and the fat content of Shidoul (23.10%) was the highest in Suzhou point. The results indicted that 19 soybean cultivars were high fat account for 17.76% in the Fuyang point.Suzhou, Xuzhou, Jining, Shangqiu, Fuyang and Longkang were listed in descending order of total protein plus fat content. The order of C.V was Jining, Longkang, Fuyang, Shangqiu, Xuzhou, and Suzhou. The high protein and fat content (Total protein plus fat?63% and fat?20%) accessions were found in all 6 test loci and 95 soybean cultivars were high protein and fat content account for 88.79% in the Suzhou point. The results indicted that the high protein and fat content of Zhongzuo07-846 was highest in Fuyang (67.1%), Suzhou (66.55%) and Longkang point (66.3%), the high protein and fat content of Zhongzuo07-754 was highest in Shangqiu (66.7%) and Jining point (66.3%), KF403-13 was highest in Xuzhou point (66.5%).3. The analysis of variation coefficient with quality and main agrionomic trails. The meta-analysis results showed that the variation range of No. effective branch per plant was the maximum, from 0.22 to 3.10; with the average being 0.031 and the variation coefficient is 41.93%. The variation range of yield was the middle, from 1878.53 to 3413.70; with the average being 2531.93 and the variation coefficient is 12.76%. The variation range of protein content from 37.31% to 46.79%; with the average being 42.57% and the variation coefficient is 3.80%. The variation range of fat content from 17.24% to 22.60%; with the average being 20.73% and the variation coefficient is 4.53%. The variation range of protein plus fat content from 59.20% to 66.00%; with the average being 63.31% and the variation coefficient is 2.11%.4. The correlation and regression analysis. The correlation analysis showed the yield had extremely significantly negative relation with protein content (r=-0.29), had extremely significantly positive relation with No. effective branch per plant, No. pod per plant, No. seed per plant and seed weight of per plant respectively. The protein content had extremely significantly negative relation with fat content, No. Pod per plant and No. seed per plant respectively (r=-0.57, r=-0.26, r=-0.43), had significantly negative relation with No. of stem node per plant and seed weight of per plant respectively (r=-0.18, r=-0.20), had extremely significantly positive relation with 100 seed weight (r=0.42). The fat content had extremely significantly positive relation with plant height and No. of stem node per plant (r=0.30, r=0.22), had extremely significantly negative relation with No. effective branch per plant, seed weight of per plant and 100 seed weight (r=-0.38, r=-0.24, r=-0.35), respectively.According to the standard regression coefficient of yield, the coefficient of determination is the highest, R2=0.847(F=51.369, P?0.01) in Suzhou point. The order of standardized regression coefficients in the Jining was Seed weight of per plant> No. of stem node per plant. That was Seed weight of per plant>100-seed weight> plant height in the Fuyang point. In Longkang, it was plant height> seed number per plant> No. of stem node per plant> No. pod per plant. In Suzhou point, it was Seed weight of per plant> plant height> No. pod per plant> 100-seed weight> No. of stem node per plant. In Xuzhou point, it was Seed weight of per plant> No. effective branch per plant> No. pod per plant> plant height.5. Path analysis. The path analysis revealed that agronomic traits which can directly and the largest affect yield are seed weight per plant with coefficients of 0.5591,0.55, 0.8375 and 0.6636 in Jining, Fuyang, Suzhou and Xuzhou test point respectively, are seed number per pod with coefficients of 0.5636. While No. effective branch per plant with coefficients of-0.2158 negative directly on yield in Shangqiu test point. |
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