First, choose a strong winter, not easy to twitch the species. Second, adopt new, plump seeds. This kind of seed has a strong growth potential and lighter twitches. When collecting seeds, the use of early bolting plants to prevent seeding is prohibited. Third, in the winter and spring low temperature seedlings, take all effective measures to avoid the temperature below 10 °C. The nighttime temperature should be above 12°C and the daytime temperature should be 15-20°C to avoid seedlings passing the vernalization stage. Fourth, increase the water and fertilizer management during the growth period to ensure normal growth and development, promote vigorous vegetative growth, and inhibit reproductive growth. Prevent drought, less fertilizer, seedlings and other environmental conditions. Fifth, under the premise of strengthening management, spray growth hormone in time, growth period 7-10 days once, and even spray 2-3 times 20-50 mg / l of 900, can promote vegetative growth and inhibit convulsions. 6. Early harvesting is not to be harvested when the convulsions are old. China Agricultural Network Editor