Banlangen is the root of cruciferous plant indigo, which is also known as grass blue, leaf is called Daqing leaf, and fresh leaf can be processed into indigo. All three are commonly used traditional Chinese medicine, cold, bitter, with detoxification, cooling blood Pharyngeal effect. The development of Banlangen production has a good market prospect. 1. Selection of land and site preparation. Radix is ​​a kind of deep-rooted plant. Its main root length is 40-50 cm. It should be planted in sandy soil or well-drained sandy loam with well-drained soil. For every 667 square meters, 3,500 kilograms of mature manure is applied. After spreading evenly, plunge the land 20 to 30 centimeters. Make a fine leveling and make it 1 meter wide. 2. Sow. Spring sowing and summer sowing, spring sowing in the end of March to early April, summer sowing in the end of May to early June. When planting, row spacing is 20 centimeters. In the raft, a 1.5 cm deep ditch is set. Spread the seeds evenly into the ditch. Then cover the soil with 1 cm or so, slightly suppress it, and water it properly. For every 667 square meters, the seed amount is 1.5-2.0 kilograms, generally 7 days to 10 days. 3. Field management. After the sowing, the soil was kept moist, and the seedling height and the height of the seedlings were 7 to 10 cm. The seedlings and supplements were planted. Finally, the seedlings were planted at a spacing of 6 to 8 cm. After cultivating the seedlings, the cultivating and weeding should be carried out frequently. Pay attention to drainage during rainy seasons to avoid rot. In case of dry weather, it can be watered early or late. In order to receive large green leaves, it is necessary to chase 3 fats in one year. After the first time, the top fertilizer is applied to 10 kg of urea in 667 m2 of ditch. Two times after harvesting, leaves are immediately topdressed. To take the radix-based, should be less nitrogen fertilizer, can be applied to cake 667 square meters 35 kg. 4. Pest control. 1 Downy mildew. It usually begins at the end of March and is harmful to the leaves. When the disease occurs, the back of the leaves produces white or gray mold, and the plants wither. Method of prevention and cure: Rational rotation with grasses and leguminous crops; reasonable close planting to reduce soil moisture; detection of diseased plants and timely removal; chemical control, using 40% aluminum alginate 200 to 300 times or 65% 500 times Liquid spray, evenly sprayed on the leaves, spraying once every 7 days for 2 or 3 consecutive times. 2 cabbage butterfly. Its larvae, commonly known as cabbage caterpillars, damage the leaves from May onwards, especially in the upper and lower parts of June. It can be controlled by spraying 90% trichlorfon 800 times. 5. Harvest processing. With the largest harvest, it can take 2-3 crops in one year. In the first half of June, the height of the seedlings is 20 cm; the second half is in the late July to early August; and the third is in the late August to early September. Select sunny harvest, to dry in time, color green quality is better. In order to harvest radices, the growth period generally does not cut the leaves. When the plants wither in late October, they must dig. Be sure to dig deep when digging and avoid cutting roots. After the soil is lifted, the net soil, stems and leaves shall be removed, spread and dried until they reach seven or eighty thousand, and they shall be bundled into small ones and then dried until they are completely dry. Roots are straight, thick, uniform, solid, and powdery. 6. Keep seed technology. In the spring and summer planting of Isatis indigotica rooting, the disease-free, robust roots were transplanted onto the planting ground. The spacing was 3 cm and 40 cm. When the seed matures from the 5th to the beginning of June of the following year, it will be harvested, sun dried, threshed, and miscellaneous. The Radix isatidis, which has received the seeds, has been lignified and cannot be used for medicinal purposes.
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