Key cultivation techniques of Radix Isatidis

We are no stranger to the term Banlangen, but we are not familiar with this kind of medicine. Its stem, leaf and root can be used as medicine, and some people call it Isatis indigotica or Isatis indigotica. It is mainly used for clearing heat and detoxification and preventing colds. It is planted all over our country, so how to plant Radix Isatidis? So today let's take a look at the key points of its cultivation techniques.

1. Dig deep into the land

The land planted by Radix Isatidis is generally at least 30 cm deep. It is a deep-rooted plant and is suitable for planting in a warm and humid environment, but it also has the characteristics of drought resistance, cold tolerance and waterlogging resistance. Therefore, the place where Radix Isatidis is planted is generally loose, close to the water source but with good drainage conditions and adequate soil fertility. Turn the land deeply and combined with fertilization, the base fertilizer is mainly farm manure, stir evenly, and then open the ditch, ready to plant.

2. Sowing time

Radix Isatidis can be sown in spring and summer. Spring is usually around March and April, and summer is May and June, but in the north, it is more suitable for planting in spring. Before sowing, we need to put the seeds into more than 40 degrees of hot water for hot seeds, and constantly stir, so that it is heated evenly, four hours later, fish out, put into the plant ash to mix evenly, and then sow seeds. Generally speaking, sowing is by way of strip broadcast or on demand. The distance between strips is generally about 20 centimeters, evenly sowing seeds and covering soil to cover seeds. On the other hand, on-demand requires the distance between each plant, which is usually about eight centimeters.

3. Field management

About a week after sowing, basically Radix Isatidis will emerge, and in half a month or so, all the seedlings of Radix Isatidis will emerge in the field. if they do not emerge after half a month, they can only replenish the seedlings. When the seedling grows to about six or seven centimeters high, it is hopeless to carry out inter-seedling, replenishment and even seedling. Make sure that the distance between each plant is about six to eight centimeters, and that each plant can leave two or three seedlings. After the seedlings are planted, it is necessary to carry out intermediate ploughing and weeding, and it is generally not recommended to use chemicals for weeding, which affects the quality of Radix Isatidis. If the main purpose is to harvest Radix Isatidis, then generally apply fertilizer three times a year, mainly urea, to promote the growth of stems and leaves of Radix Isatidis. However, if it is for the purpose of harvesting the roots, we need to apply potash and phosphate fertilizers together with plant ash on the basis of three times of topdressing, which can promote the growth of the roots.

4. Prevention and control methods

The prevention and control of diseases and insect pests is a difficult point in the cultivation technology of Radix Isatidis, because it is a kind of traditional Chinese medicine, if excessive drug control is used, it will affect the quality of Radix Isatidis. The main diseases and insect pests of Radix Isatidis are downy mildew, leaf blight, root rot and so on. Downy mildew usually begins in March and April, and the peak of the disease is from June to August. We can control it by reducing moisture and controlling the use of nitrogen fertilizer, and spray mancozeb if necessary. While leaf blight and root rot can be controlled by carbendazim. The most common pest is Pieris rapae, which mainly harms the foliar surface of Radix Isatidis. The peak of the disease is around June, and pyrethroid pesticides can be used for spraying.

The editor would like to remind you that when planting, you must grasp the main points of cultivation, and secondly, when using chemicals for prevention and control, replenishment must be carried out within half a month to one month before harvest, so as not to affect the quality.