Effects of different sowing dates on agronomic characters and quality of oil sunflower
In order to provide reference for sunflower cultivation in central China,the effects of different sow-ing dates on the flowering habits,economic traits,yield and quality of sunflower were researched.The results showed that the time from sowing to flowering was greatly shortened by transplanting seedlings than direct seeding in early spring.Except for the early-maturing variety 6K132,the maturity time of sunflower for each sowing date treatment was shortened with the delay of sowing date.The maturity time of summer and autumn sowing treatment was shortened by 9-25 days compared with that of early spring sowing,and by 9-11 days compared with that of spring sowing.The effects of direct seeding and seedling transplantation in early spring on grain yield were different between two years,and there was interaction effect with varieties;The fatty acid content of oil sunflower was signifi-cantly affected by different sowing dates,linoleic acid content of seeds harvested from summer and autumn sowing treatment increased significantly,increasing by 13.2%-39.1%and 16.0%-35.4%in 2021 and 2022,respectively.The L/O(linoleic acid content/oleic acid content)ratio increased from 0.39-0.65 and 0.26-0.67 in spring sowing to 1.47-3.42 and 0.65-2.11 in summer/autumn sowing,respectively.In addition,seeds harvested from summer and autumn sowing had the best germinating ability,with emergence rates of 92.2%to 97.8%(for 2021 year)and 60.0%to 93.3%(for 2022 year),respectively.It was concluded that sunflower seeds with different L/O ratios can be pro-duced by selecting different sowing dates in Wuhan and other central provinces.Sowing in spring can increase the oleic acid content of sunflower seeds,while sowing in summer and autumn can increase the linoleic acid content.The demand of biannual sunflower production and multi-season flower viewing can be realized in the central region,and has the potential to increase the yield through variety selection and appropriate cultivation measures.High qual-ity seeds can be obtained by adjusting sowing date to avoid high temperature and high humidity in flowering and fill-ing stages,sowing in summer and autumn is beneficial to improve seed quality.
万方数据
维普
