Artemisia annua

Artemisia annua is an annual or biennial herb with a peculiar odor. Stem erect, 40-90 cm high, medium forage plants. Artemisia annua is distributed in China's northeastern, Inner Mongolia, Hebei, Henan, Shanxi, Shandong, Shaanxi, Gansu, Ningxia, Qinghai provinces and regions.

Artemisia annua is actually a traditional Chinese herb with a strong aroma. Its seedlings can be used as a diuretic and anti-inflammatory drug to treat jaundiced hepatitis, as well as clearing heat and relieving malaria, driving away wind and relieving itching, etc. In addition, it is rich in nutrients and can also be used as a medicine to treat jaundice. In addition, it is rich in nutrients and can be used as camel forage for better growth, and the whole plant can be used for the extraction of aromatic oil.

Cultivation techniques

1, selecting the whole land

Artemisia annua is not strict on the soil requirements, although the general land can be cultivated, but choose the terrain to the sun, well-drained, loose fertile sandy loam or clay loam cultivation, the growth of the more lush, stems and leaves in the artemisinin content will be higher. content will be higher.

Autumn will be raw barren land in accordance with the conventional deep turning, the conditions of the region can be combined with the turning of the ground into the base fertilizer, per acre into the 1500-2000kg of composted manure or stable fertilizer, after the turn over of the soil, remove branches, stones, grass roots, rake and do beds. Border height of about 25cm, 1.2m wide, border east-west, planting north-south, in order to receive light.

2, sowing seedlings

Artemisia annua seed germination temperature of 8 ℃ -25 ℃, when the early spring temperatures in 10 ℃ -25 ℃ can be sown, sowing will be mixed with a little fine sand seeds evenly spread or open furrow strip seeding, the amount of seed per acre for 150-200g, covered with fine soil (to cover the seeds to the degree), sprayed thoroughly after sowing water Moisturizing, 3-6 days germination, just out of the ground when the cotyledons are small, round, about 12 days to grow true leaves.

3, field management

Interplanting in the seedling height of 4-5cm, keep the spacing of 5cm, so that it grows evenly. One month after sowing, the first loosening of the soil and weeding, so that the surface is dry and loose, slightly moist underground, prompting the roots to root down, and be careful not to water, fertilizer, so that the above-ground growth is slow.

When it grows to 60-80 days, the stem leaves within the beginning of the lateral branches, its root system has been developed, the need for fertilizer, can be combined with loosening and weeding 2-3 times, to human urine-based, 1000-1500kg per acre, but also fast-acting ammonia fertilizer can be applied to promote the growth of stems and leaves, to improve the yield and quality. Don't stick the fertilizer on the plant stem and leaves when applying fertilizer to avoid burns. Artemisia annua avoided flooding, therefore, continuous rainy season should pay attention to timely drainage to prevent root rot.

4, harvesting and processing

Artemisia annua differs significantly in artemisinin content in the leaves of different reproductive periods. Harvesting period on the yield of Artemisia annua and artemisinin content of the impact is obvious, harvesting period should be determined to obtain the maximum yield of artemisinin for the purpose. The suitable harvesting period varies among different origins, with Guangxi harvesting the best in late August at the first bud stage and Shandong harvesting the best in September at the bud stage. The collection time is from 12:00 noon to 16:00 p.m. on a sunny day, and the plants harvested during this period have the highest artemisinin content.

Different drying methods also have a certain effect on the yield of artemisinin, natural sun-dried is the best.