净套作下不同耐荫性大豆品种农艺性状及产量分布的研究

Agronomic Characters and Yield Distribution of Different Shade Tolerance Soybean under Monoculture and Relay Strip Intercropping Systems

选用耐荫性不同的3个大豆品种,研究其在单作和大豆玉米套作条件下的农艺性状及产量分布情况。结果表明,与单作相比,套作增加大豆株高和底荚高,分枝减少,茎粗减小,产量降低,耐荫品种变幅均为最小,不耐荫品种变幅最大。套作大豆产量垂直方向分布向上移动,耐荫大豆以20～40 cm产量最高,20～60 cm产量所占比重大;不耐荫品种以40～60 cm产量最高,且40 cm以上产量所占比重大。与单作相比,套作下大豆产量分布向分枝集中,耐荫大豆分枝产量高于主茎;不耐荫大豆主茎产量高于分枝,且主茎产量所占比重明显高于单作。

To study the agronomic characters and yield of different soybean varieties under monoculture and relay strip intercropping systems, three different shade tolerance varieties were planted. The results showed that compared with monocuhure, the plant height and first pod height increased, the branch numbers and stem diameter decreased in relay-cropping. The varia- tion range of soybean with good shade tolerance was smaller than the sensitive cuhivar. The vertical distribution of yield ascen- ded in relay-cropping system, soybean with better shade tolerance had the highest yield in 20-40 cm, and the highest ratio in 20-60 cm. Soybean sensitive to shade had the highest yield in 40-60 cm,and the highest ratio in above 40 cm. The horizontal distribution of yield centralized to the branches, and the yield in the branches of shade tolerant soybean was higher than the stem. In verse,the yield in the stem of shade sensitive soybean was higher than the branches and the ratio of stem yield was higher than monoculture.