Choose sandy loam and loam with neutral or slightly acidic soil pH, moderate soil aggregate structure, organic matter content of 1% ~ 1.3%, sunny, deep plough layer and good drainage. Apply 4,000 kilograms of livestock (poultry) decomposed fertilizer, green storage fertilizer or straw compost every 667 meters; 80 kg of bio-organic compound fertilizer; Or 20 kilograms of nitrogen fertilizer and 50 kilograms of potassium sulfate. Before sowing, plow more than 20 cm, carefully level and rake, and do a good job in soil moisture. From the end of July to the beginning of August, shallow ditches were dug between the rows of previous crops, with the depth of 1 ~ 1.5cm. Seeds were evenly spread into the ditches, covered with 1mm soil, slightly trodden after sowing, and covered with wheat straw where conditions permit, which can improve the emergence rate. After harvesting in autumn, no other crops will be planted in the second year. Before sowing, the seeds were soaked in warm water at 30 ~ 40℃ for 24 hours, filtered and mixed with 3 parts of wet sand, and germinated at about 20℃ 10 ~ 12 days. Use 2.5 ~ 3 kilograms of seeds every 667 meters.