1-09: Evaluation of sunflower stalks as a lignocellulosic biomass depending on seeding delay

Sunflower has been assessing as a rotating crop for double-cropping with rape in South Korea for years. Sunflower sown from mid spring to early summer after harvesting rapeseed showed the whole stalk weights decreased depending on seeding delay. In the compositional analysis of sunflower stalks, the contents of both hot-water extractives and ash were gradually increased, but the structural components such as cellulose, hemicelluloses, and lignin tend to be slightly decreased. Effects of the increasing water extractives and ash contents of dry biomass on sugar yields assessed by hydrothermal treatment and subsequent enzymatic hydrolysis were investigated to produce a good fermentable sugar.