Key points of Isatis root planting technology, strengthening field management is the key

Soil: it is best to choose fertile and loose sandy soil, ploughing the land above 30cm and applying base fertilizer. Sowing: you can choose spring or summer. Before sowing, you need to put the seeds in 40 ℃ of hot water for about 4 hours. Field management: timely uniform seedlings and seedlings, pay attention to weeding and fertilization and other work. Pest control: the high incidence period of downy mildew is summer, and the high incidence period of leaf blight and root rot is June, which needs active control.

1. Soil

Radix Isatidis does not have high requirements for land, can adapt to any soil, and can withstand both drought and cold. But if you want to better plant, in the choice of soil, try to choose fertile, loose, good drainage effect of sand-based, and in the topography of the choice, to flat terrain, warm, humid environment is appropriate.

2. Land consolidation

When planting Radix Isatidis, because it belongs to deep-rooted plants, it is best to turn the soil more than 30 centimeters deep when planting. In addition, it should be combined with fertilization, and fertilize the land once before sowing after ploughing.

Base fertilizer can choose to pile farm manure or chemical fertilizer, chemical fertilizer mainly includes phosphate fertilizer, potassium chloride and urea, the amount of chemical fertilizer is about 2000kg/ mu. When applying fertilizer, mix it well with the soil, then level the land and repair the drainage ditch so that you can start planting.

3. Sowing seeds

Radix Isatidis can choose two seasons to sow, namely, March and April in spring and May and June in summer. According to the climatic conditions, the north is more suitable for sowing in March and April in spring, while the south is more suitable for sowing in May and June in summer. When sowing, you need to pay special attention to blanching the seeds in hot water above 40 degrees for about 4 hours. in order to make each seed heated evenly, you need to keep stirring.

After the hot seed is finished, put the seed into the plant ash and stir evenly to sow the seed. Before sowing, it is best to use chemical herbicides for weeding, use alcohol EC and water to spray on the soil surface, and then start sowing 5 days later. The way of sowing can be strip sowing or on demand, strip sowing and on demand should pay attention to the distance between each plant in the future, strip sowing is about 20 cm, on demand is about 8 cm.

4. Field management

The management is mainly weeding and fertilization. After sowing, Radix Isatidis can generally emerge in about 15 days, and where there is no emergence, you need to replenish the seedlings in time. When the seedlings reach more than 6 centimeters, in order to reach about 8 centimeters between each plant, it is also necessary to homogenize and interplant seedlings in time. Weeding can be carried out after the seedlings are planted, and in order not to affect the quality of Radix Isatidis, it is best not to use chemical herbicides to weed. Fertilizing, mainly urea, potash, phosphate and plant ash, topdressing 3 times a year.

5. Pest control

The main diseases and insect pests of Radix Isatidis are downy mildew, leaf blight and root rot. The high incidence period of downy mildew is in summer, the symptom is that the leaves become white or gray-white mildew, then timely drainage to improve soil moisture, with appropriate amount of Bordeaux solution or manganous solution sprayed on the leaf surface. The high incidence period of leaf blight and root rot is about June, when the disease occurs, we should pay attention to the timely drainage of the field to avoid stagnant water, and carbendazim can be used for prevention and control.