Cultivation techniques of Artemisia annua in Solar greenhouse

1. Requirements for environmental conditions 1. Temperature chrysanthemum chrysanthemum is a semi-hardy vegetable, like cold, cool and mild climate, afraid of hot. The seeds germinated at 10 ℃, and the optimum temperature for growth was 17-20 ℃. Above 29 ℃, the leaves were small and few, and the texture was thick and old. Can withstand a short-term low temperature of about 0 ℃. two。 Artemisia annua L. is a long-day crop, which can tolerate weak light, and high temperature and long sunshine can cause bolting and flowering. Bolting is generally not easy to occur when cultivated in solar greenhouse in winter and spring. 3. Water chrysanthemum chrysanthemum is a shallow root vegetable with fast growth and small nutritional area per plant, which requires adequate water supply. The soil should always be kept moist. 4. Soil fertilizer is not very strict to the soil, but the fertile loam is the most suitable for the growth of Artemisia annua when its ph value is 5.5-6.8. Due to the short growth period and taking stems and leaves as commodities, it is necessary to apply available nitrogen fertilizer at the right time. 2. The varieties of Artemisia annua can be divided into two types: big leaf species and small leaf species. The big-leaf species has higher yield, but poor cold tolerance, which is mainly cultivated in the south. Small leaf species, also known as Artemisia annua, is not as good as Artemisia annua L., with strong cold resistance, short growth period and strong aroma, which is the main type in the north. (3) 2500-5000 kg of high-quality farm manure, 50-100 kg of calcium superphosphate and 50 kg of ammonium bicarbonate are used for land preparation and fertilization. Apply it to the ground, turn it over twice by hand, and mix the fertilizer and soil well. After holding flat to make a bed, the width of the border is 1 to 1.5 meters, and then hold flat and tread gently in the border to prevent sinking after watering. Fourth, the sowing amount is 1.52kg per mu. It can be divided into broadcast and strip broadcast. When sowing, trench is opened at a distance of 15-20 cm in the border, with a depth of 1 cm. Water is watered with a pot in the ditch, and the soil is covered with seeds after water infiltration. Fifth, post-broadcast management 1. Water and fertilizer management should keep the ground moist after sowing to facilitate seedling emergence. The seedlings were watered when the seedling was 3 cm high, and watered for 2 times during the whole growth period. Seedling height 9 cm 12 cm topdressing the first fertilizer, with the water mu of ammonium nitrate 10 kg 15 kg, a total of 2 times. two。 Temperature management after sowing, the temperature is slightly higher, sunny day 20: 25 ℃, night 10 ℃, 4-5 days or 6-7 days. After emergence, it can be 15: 20 ℃ in daytime and 8: 10 ℃ at night. Sixth, the harvest of chrysanthemum chrysanthemum is divided into one-time harvest and phased harvest. One-time harvest is 40-50 days after sowing, the seedling height is about 20 cm, close to the ground to harvest. There are two methods of harvesting by stages, one is to harvest thinly, the other is to keep 1 or 2 side branches, watering and fertilizing once after each harvest, and can be harvested again every 20 to 30 days. The yield is 1000-1500 kg per mu.