The links needing attention in the cultivation of Artemisia annua L.

Soil preparation and fertilization should choose neutral or slightly acidic loam with deep soil layer, loose and moist soil, rich organic matter, convenient drainage and irrigation, good water and fertility conservation. Turn the soil deeply before sowing and apply 1000 kilograms of rotten manure per mu. It is made into a high compartment 1.5 meters wide with a ditch depth of 20 to 25 centimeters.

Sowing chrysanthemum chrysanthemum plant is small, the growth period is short, can be intercropped with other vegetables, intercropping. Direct seeding is often used in production, either broadcast or strip sowing. Sowing seeds with 4 kilograms per mu. Strip sowing uses 2 to 2.5 kg of seeds per mu with a row spacing of 10 cm. In order to promote seedling emergence, the seeds were soaked in warm water of 30 ℃ ~ 35 ℃ for 24 hours before sowing. After washing, they were removed and placed under the condition of 15 ℃ ~ 20 ℃ to accelerate germination. Rinse with clean water every day, and sow seeds when the seeds were exposed for 3 to 4 days. Sow seeds on a sunny day in spring, cover them with film after sowing, properly control water after emergence, maintain a suitable temperature, and promote the healthy growth of seedlings. The temperature is high in summer and autumn, so cover with sunshade omentum and other mulch after sowing to keep the soil moist. There should be time seedlings in the seedling stage to ensure that the seedlings have a certain nutritional area.

The field management keeps the soil moist from sowing to before emergence, and the seedlings can be completed in 6-7 days. Watering should be properly controlled after sowing and emergence in winter and spring, and interseedling should be carried out when the seedlings have 2 or 3 true leaves. Sowing, large-leaf chrysanthemum 6 cm square to retain strong seedlings, middle or fine leaf chrysanthemum 3 cm square to retain seedlings; strip sowing, large-leaf chrysanthemum plant spacing 5 cm, middle-leaf chrysanthemum 4 cm, fine-leaf chrysanthemum 3 cm. Adequate water supply to keep the soil moist. When the plant height is about 10 cm, the available nitrogen fertilizer is applied twice with the water, and the harvest begins when the plant height is about 20 cm. After the first knife was cut, it was watered and fertilized to promote the occurrence of lateral branches, and harvested after 20-30 days. 500 kg of rotten human and animal feces and 3 kg of urea were applied each mu.

Pest control 1. Disease. The main diseases are bacterial blight, leaf spot, Sclerotinia sclerotiorum and so on. In order to prevent and control the blight, we should strengthen the comprehensive agricultural control measures, pay attention to sowing at the right time, prevent the sowing too densely and the seedlings grow excessively, and chlorothalonil wettable powder can be used for chemical control. For the prevention and control of leaf spot disease, rotation should be carried out and field management should be strengthened. two。 Pests. Insect pests are mainly vegetable borer, aphids and so on, the control methods are the same as the general cultivated vegetables, but to avoid the application of high and toxic pesticides.

It can be harvested when the plant height is 20 cm at the right time. Leave 2-3 leaves at the base of the stem to cut off to promote the occurrence of lateral branches.