Cultivation techniques of traditional Chinese Medicine Radix Isatidis

Land selection and preparation

Choose the unconsolidated sandy loam with flat terrain, convenient irrigation and more humus. The terrain is too high or too low, the sand is too large and the newly formed land is not suitable. After selecting the land, deeply plough, break the soil, apply sufficient base fertilizer (mainly organic fertilizer, can be mixed with some river mud, or rotten cake fertilizer, and then make a bed, the width of the bed is about 240 cm. The border is in the shape of a tortoise. Open the border ditch, surround the ditch, make the ditch communicate with each other, and have a water outlet.

Planting method

1. Cultivated seeds should be cultivated separately if they harvest roots and do not bear seeds in the same year. When planing and harvesting Radix Isatidis, select the root strips with straight, thick, unbifurcated, strong and disease-free roots, transplant them into the fertile seed field according to the plant and row spacing of 30 × 40 cm, water them in time, spread a thin layer of soil and miscellaneous fertilizer in late November to prevent cold, water loose soil when the seedlings turn green the next spring, when the seedlings are 6-7 cm high, top dressing and watering to promote exuberant growth, and when bolting and flowering, topdressing fertilizer once again to make the seeds full. After the seeds are ripe, they are harvested in batches, dried in time after harvest, and kept properly.

two。 Soak the seeds in 30 ℃ warm water for 3-4 hours before sowing, remove the seeds and mix them with an appropriate amount of dry fine soil to facilitate sowing.

3. There are two kinds of sowing: spring sowing and summer sowing. Spring sowing takes place between Qingming Festival and Grain Rain, and summer sowing takes place from Grain in Beard to the Summer Solstice. The quality of spring sowing goods is better. Sowing method: strip sowing or sowing can be used and multi-purpose sowing can be used. In the whole border surface, open wide ditch for sowing, row spacing 18-20 cm, sowing width 4-5 cm, covering soil after sowing, slightly filling and pressing, then watering. The sowing rate is 1.5-2 kg per mu, and seedlings can emerge in 5-10 days.

Field management

1. About 10 days after weeding and emergence, the seedlings can be combined with loosening soil. When the seedling height is 5-10 cm, the seedling can be determined in a triangle according to the plant distance of about 6 cm. If there is enough water and fertilizer, it can be denser properly. I weed a lot.

2. During the growth of Isatis indigotica, the leaves of Isatis indigotica were cut twice, and a large amount of fertilizer was needed for plant growth. in addition to applying sufficient base fertilizer during sowing, topdressing should be applied in time after each leaf was cut, and manure should be applied again in the middle of August to promote root growth.

3. After irrigation and drainage, the weather is dry, so it can be irrigated combined with topdressing, especially after leaf picking. In the rainy season, ditches should be cleared in time to manage soil moisture to avoid stagnant water and rotten roots in the field.