Technical points of field management measures of Artemisia annua L.

The optimum temperature for the growth of Artemisia annua was 17-20 ℃. When planting in protected areas for more than 25 ℃, the vents should be opened for ventilation. When the seedlings grow to about 10 cm, the leaflet species are pulled out square by plant and row spacing of 3-5 cm, and the large leaf species are pulled out by 20 cm or so, and weeds are eradicated at the same time. After the seedlings were unearthed, the seedlings began to be watered to keep the soil moist. Quick-acting nitrogen fertilizer was applied 10-15 days before each harvest, 15 kg of potassium nitrate and 8 kg of urea per mu. Prevention and control of diseases and insect pests of Artemisia annua mainly from agricultural control hands, reasonable fertilization and watering to avoid sudden changes in temperature management, create a good ecological environment and promote the healthy growth of plants. When the seedlings grow to 18-20 cm high, the leaflet seeds are harvested once on the ground, wash the soil from the roots, and tie them into small handfuls on the market. The harvest of Artemisia annua is more flexible, it can be harvested at one time, or it can be harvested many times by sowing at one time. The method is to leave 4-5 leaves or 1-2 side branches at the base of the main stem, cut the upper young main branches or side branches with hand pinch or knife, bundle them into a handful and put them on the market every 20 days or so. Watering and topdressing in time after each harvest to promote the germination of lateral branches.