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[Objective] The present paper aimed to analyze the main factors affecting the yield of Brassica napus L in different regions of Sichuan province, so as to provide theoretical basis for breeding B. napus L. varieties suitable for different rapeseed producing areas in Sichuan province. [Method] Variation analysis, correlation analysis and path analysis were used to analyze the relationship between the agronomic characters and the yield of B. napus L . [Result] In Xindu, Deyang and Dazhou regions, the most variation of agronomic trait was the first branch numbers. The value was the number of seeds per siliquain Chongzhou and Mianyang regions. It was the number of effective siliqua per plant in Nanchang, Yibin, Jianyang, and Leshan regions. The least variation of agronomic traits was the plant hight, in the Xindu, Chongzhou, Jianyang, Mianyang, and Deyang regions. It was 1000-seed weight, in the Nanchang, Yibin, Leshan, and Dazhou regions. The yield of Xindu region was significant or highly significant negative correlated with the first branch numbers and the number of effective siliqua per plant But, it was significant positive correlated with the plant hight and the number of seeds per siliqua. The yield of Nanchang region was significant or highly significant positive correlated with the plant hight, the first branch numbers, and the number of effective siliqua per plant. The yield of Yibin region was highly significant positive correlated with the plant hight. The yield of Jianyang region was significant or highly significant positive correlated with the number of effective siliqua per plant and the number of seeds per siliqua. But, it was highly significant negative correlated with the 1000-seed weight. The yield of Leshan region was significant positive correlated with the number of effective siliqua per plant. There was no significant correlation between yield and main agronomic traits in Mianyang, Deyang, and Dazhou region. In Xindu region, the greatest direct path coefficient and the greatest comprehensive effects were respectively the number of seeds per siliqua and the the number of effective siliqua per plant. Those were both the number of seeds per siliqua in Chongzhou region. In Nanchong and Jianyang regions, the greatest direct path coefficient and the greatest comprehensive effects were respectively the number of seeds per siliqua and the 1000-seed weight. Those values were respectively the number of effective siliqua per plant and the first branch numbers in both Mianyang and Dazhou regions. In Deyang region, the greatest direct path coefficient and the greatest comprehensive effects were both the number of effective siliqua per plant. [Conclusion] There were differences in the coefficient of variation of main agronomic traits of B. napus L in different producing areas of Sichuan province, and there were differences in correlation with yield. The effects of yield components on yield should be fully considered in breeding, as well as the comprehensive effects of other traits. The present study provides a scientific basis for breeding B. napus L varieties suitable for different regions of Sichuan province. [ABSTRACT FROM AUTHOR]

【Objective】 In order to provide the theoretical basis for breeding of vegetable faba bean, the direct or indirect effects of major agro¬nomic traits on freshi grain yield of early-matiare and autumn-sowing faba bean and the coefficient of determination were determined.【Meth- od】Thirteen cultivars of early-mature and autumn-sowing faba bean were used to carry out the correlation and path analysis of 15 major agro¬nomic traits to 2 kinds of fresh yield.【Result】 The results showed that the coefficient of variation (c. G ) of seed per plant, pod per plant, nodesof having pods,100fresh seed weight andwidthoffreshpod were 28.57 ', 19.56', 18.56', 17.51 ' and17.39', respec¬tively. These traits could be improved by breeding or farming practices. The largest c. G. of yield was cotyledon yield followed by yeed yield. Number of effective branches, nodes of having pods, pods per plant and seed per plant had extremely significant correlation with yield of fresh pod. The rate of producing cotyledon had extremely significant correlation withi yiel(d of freshi cotyledon. Yield of fresh cotyledon and pod had significant correlation with each other. Path analysis showed that both number of effective branches, pods per plant had positive di¬rect effect and had extremely yignificant correlation with yield of fresh pod. Bothi of thiem should be the main traits in breeding programs, se¬ lection should be based on the characteristics of thie traits which we were more interested in. Rate of producing cotyledon affected cotyledon yield.【Conclusion】 Among all the yield traits, pod yield showed significantly lower variation and should be the focus of our breeding program in Yunnan province. When yield of pod was the target of breeding, number of effective branches and pods per plant should be the main se¬ lecting traits combining with nodes of having pods and seed per plant. When yield of cotyledon was the target of breeding，rate of producing cotyledon was the main selecting trait [ABSTRACT FROM AUTHOR]