套作大豆农艺及产量性状研究

在与玉米套作条件下，对33份大豆材料的农艺及产量性状进行了研究。结果表明：套作大豆平均株高122.98cm，主茎节数较少，单个节间较长；分枝对于套作大豆产量形成极为重要，参试材料平均分枝数为5.05个，分枝粒重占单株粒重81.1%；相关分析表明，套作大豆产量与分枝粒重、最高分枝高、有效分枝数、平均分枝长度、生育期（天）极显著正相关，与主茎节数和营养生长期显著正相关；主成分分析结果表明，分枝因子、主茎因子、产量因子和结荚因子等四个因子对对变异的贡献率达77.28%。本文研究结果可为生产上套作大豆专用品种筛选和选育提供理论依据。

Research on the agronomic and yield trait of relay cropping soybean

Abstract: The main agronomic characteristics and yield of 33 soybean materials were studied under relay intercropping systems. The results showed that the average height of materials reached 122.98cm with relatively less node number and prolonged node length. Branches were extremely important to yield formation, the average branch number of materials was 5.05, while branch yield accounting for 81.1% of the plant yield. Correlation analysis showed that the yield of relay intercropping soybean was significantly positively correlated with the seed weight of branch, the height of the highest branch, the effective branch numbers, the average branch length, the number of node on main stem, the growth period and vegetative period, and the length of vegetative period. The strong capability of branching and bearing were essential for higher yield in relay intercropping soybean. Principal component analysis showed that the branching factor, stem factor, yield factor and pod factor altogether contribute 77.28% to the variation rate. Results of this study will provide theoretical basis for selection and breeding of special soybean varieties for relay intercropping planting.