Cultivation techniques of Artemisia annua L.

Artemisia annua is generally cultivated in flat beds, which can be sowed or sowed. Sowing seeds in spring is often used to sow seeds to accelerate germination. Sowing using wet sowing method, first watering bottom water, water infiltration and then sowing, covering soil thickness of 1 cm, the following Qiannong network editor to introduce the planting technology and management methods of Artemisia annua!

Land selection and preparation

Chrysanthemum chrysanthemum is suitable for cultivation in sandy loam soil, which requires convenient irrigation conditions. After selecting the land, turn the soil, and apply excellent farm manure, more than 1000 kg per 0.1ha, 25 kg diammonium phosphate as base fertilizer. Make a flat bed with a width of 1.2 to 1.4 meters and a length of 10 to 20 meters, ready to sow seeds.

Sowing and seedling raising

1. Seed treatment: 3-4 days before sowing, soak the seeds in 50-55 hot water for 15 minutes and soak them for 12-24 hours, put them in a warm place about 25 ℃ to accelerate germination, and wash them with clean water once a day during germination. If the new seeds should be treated at 0: 5 ℃ in advance, the dormancy would be broken in about 7 days.

2. Sowing selection: spring protected cultivation generally uses hotbed sowing and seedling raising in late March or April: open-field cultivation in spring, sowing and raising seedlings in hotbed in mid-April; open-field direct seeding in spring, sowing in small arch shed or plastic film in early May, summer and autumn, sowing in cold bed or open field in batches, sowing in 7-10 days.

3. Sowing method: visible cultivation method (direct seeding or seedling transplanting) is adopted by sowing or strip sowing, the seed amount per hectare is 60-70 kg, the strip sowing is about 10 cm apart, and the seed consumption is 30-37.5 kg per hectare. Seedling sowing in early spring seedling bed should be covered with medicine and soil to prevent sudden death. The suitable seedling age is 20 ~ 0 days, and the suitable planting period is 3 ~ 4 true leaves.

Planting and field management

It usually takes 5-7 days from sowing to germination. During germination, attention should be paid to moisturizing to prevent the soil from drying. When the height of the seedling is 2-3 cm and 1-2 true leaves, the seedlings are pulled out in the field to keep the distance between plants 1-2 cm. After shallow and middle ploughing, when the seedlings were planted at the stage of 3-4 true leaves, the temperature outside or in the greenhouse should be stable through 10 ℃. The distance between planting or fixing seedlings should be 4-6 cm. Watering the seedlings for the first time, watering the seedlings again after fixing the seedlings, and topdressing the available nitrogen fertilizer with the water. The seedlings can be harvested from time to time in the future.

Harvest

The general growth period of Artemisia annua is 40 to 50 days. When the plant is about 20 centimeters high, it can be harvested with 12 true leaves. In order to keep the products fresh and tender, the harvest should be carried out in the morning. Untimely harvest and high temperature will lead to aging of stems and leaves, poor quality, or elongation of internodes, bolting and flowering. If you want to harvest many times, you can use a knife to leave 2-3 cm at the base of the main stem, and the tender stems and leaves will be tied up into 0.5 kg handfuls on the market. It is watered after cutting and can be harvested again in a month.