Direct seeding can be divided into dry seed direct seeding and accelerated seed direct seeding according to whether seeds germinate or not. The sowing date of direct seeding should be 10 cm, and the ground temperature should stably pass 15℃. Live broadcast in the open field also requires that the local final frost period has passed. The specific operation method is as follows: open a hole about 1 cm deep at the border, put in 3 ~ 4 seeds or buds, and cover the soil. The depth of soil covering depends on seed size, soil quality and water content. For large seeds, sandy loam or soil with poor water content, the covering soil is slightly deeper and shallower, with a general thickness of 2 ~ 3 cm. Dry seeds can emerge in 7 ~ 10 days after sowing, and will be delayed in case of low temperature or poor soil moisture; It can germinate 5 ~ 7 days after direct seeding, but long-term exposure to low temperature and high humidity will easily lead to rotten buds, and dry buds will appear when exposed to poor water, and the germination rate is not as good as that of dry seeds, so dry seeds are generally used for direct seeding in production. The technical points of field direct seeding are as follows: the land should be deeply turned and leveled, and the border should be carefully made; The soil moisture content should not be too low. If the bottom moisture content is poor, water it before sowing. Sowing depth should be uniform; Spray insecticide on the seed hole. In order to prevent the seeds from insufficient moisture, poor seedling emergence at low temperature or uncovered, shallow sowing and deep covering with soil can be adopted. The method is as follows: after shallow sowing, pile a mound of 5-7 cm high on the sowing hole, and when it is found that the seeds begin to bend their necks and top the soil about 5 days after sowing, the deep-covered mound can be removed to make the sprouts unearthed as soon as possible.