2. Sorghum is the fifth largest cereal crop in the world, which has the characteristics of high biomass, drought resistance, waterlogging tolerance and salt tolerance. As a variety of sorghum, sweet sorghum has a high sugar content in its stems, and its main components are sucrose, fructose and glucose. It is an important raw material for feed, brewing, industrial starch and bioenergy, and plays an important role in the adjustment of agricultural industrial structure, the development of herbivorous animal husbandry and ecological improvement and protection in northwest China.