Effects of waterlogging stress at seedling stage on yield and quality of directly-seeded rapeseed under no-tillage condition

A field experiment on oilseed rape variety Chuanyou 36 was carried out to study the effects of waterlogging stress on yield and quality of directly-seeded rapeseed. The time durations for waterlogging at seedling stage were set as 0 d,3 d,6 d and 9 d. Normal water administration was performed afterwards. The results revealed that the seedling root growth and secondary branches development were inhabited the most by waterlogging. The oilseed rape plant grew rapidly after waterlogging relief in 3-day or 6-day water logging treatment. The yield traits and quality traits of rapeseed except for linolenic acid droped in waterlogging treatments. The yield droped by 3. 44% to 21. 69% as waterlogging lasted from 3 d to 9 d. The 1 000-grain weight was the most responsible for the yield according to grey correlation analysis. Oleic acid content,linoleic acid content and linolenic acid content were independent of waterlogging. Among the quality traits oil content was decreased by waterlogging. The yield and quality of oilseed rape were significantly influenced by 6-d or 9-d waterlogging.