Abstract:

In order to clear the correlation between traits of Oil-sunflower and yield，and to providetheoretical support for breeding fifteen hybids were studied by Correlation Analysis and Path Analysis on summer sowing oil-sun flower in South of Shanxi. It was demonstrated that plant height, stem diameter, the number of single disc seed, and single disc weigh with yield showed a significant or extremely significant correlation, while fall percentage with yield showed a significant negative correlation. The path analysis showed that the number of single disc seed and single disc weigh influenced yield directly, stem diameter influenced yield indirectly, plant height and fall percentage influenced yield synthetically. Further analysis showed that with the increase of plant height and the number of single disc seed yield first increased then decreased. When the number of single disc seed was 1352-1428, plant height was 172.1-176.8 cm, yield reached the biggest. With the increase of stem diameter and single disc weigh yield increased continuously, With the increase of fall percentage, yield decreased continuously. The results can be used to breed oil-sun flower hybids.