The roots and leaves of the Brassica plant are cruciferous. The roots and leaves can be used medicinally. The plant is a suitable Chinese herbal medicine with a strong adaptability, warm and sunny environment, cold-resistant, in addition to low-lying water and heavy soil, China Both north and south can be planted. In recent years, good results have been achieved in landscaping. The high-yielding cultivation techniques of this medicinal plant are described below.
First, soil fertigation
Because Banlangen is a deep-rooted plant, sandy loam soil with flat topography, good drainage, and loose fertility should be selected. Combine land preparation, apply per hectrozed compost or fertilizer 2000-3000 kilograms, plant ash 100 kilograms, calcium superphosphate 20-30 kilograms, deepen over 40 centimeters, and then shallow plowing 1, fine leveling, making width 1 - 1.5 meters of flat rake, sowing water to make rake.
Second, sowing
Spring sowing and summer sowing. Spring sowing in mid-April, summer sowing in late May. Spring sowing should not be too early, because after the seed is affected by the early spring cold, it will go through the vernalization stage, twitching and flowering ahead of schedule, and the fertility period will be invalid. Seeds were soaked in warm water at 30°C-40°C for 4 hours before sowing. Remove and dry. Drilling and hole planting can all be used. Drilling method is adopted. Drilling is carried out at a spacing of 20-30 cm in the raft and the ditches are 1.5-2 cm. The seeds are mixed with fine sand evenly into the ditch, and the cover is earthed after 0.5-1 cm. When the temperature is 18°C ​​to 20°C, the temperature can be 7-10 days, and the planting distance can be 25 cm. The germination rate of isatis root seed is 70%. The seed is 1.5-2 kg per acre.
Third, field management
1. Seedlings. Seedling height 5-7 cm seedlings, seedling height 10-15 cm when the Dingmiao, thinning and Dingmiao to stay weak and strong, timely fill the seedlings, the stage to keep the soil moist.
2. Weeding and weeding. After the seedlings are planted, they should be cultivated and weeded once, and then every other month or so. Once the plants are sealed, they will no longer be cultivated and weeded.
3. Top dressing. From May to July, 500-1000 kilograms of urine or 10 kilograms of urea were applied to the furrows per acre, and 10 kg of superphosphate was added. Ammonium sulphate 5-7 kg per acre after each leaf collection (don't use ammonium bicarbonate).
4. Watering drainage. Water should be watered in time when the weather is dry in summer, and ditches should be drained during the rainy season to prevent rot.
5. Breeding methods. With seed breeding, Radix is ​​rooted without seed. In late October, when picking up the roots of Banlangen, roots without pests and diseases, rough roots and robust, indelible roots were transplanted to the fertile fields for planting at a spacing of 50 cm to 30 cm, and watering was carried out in time to strengthen field management. The second year was 5 - In June, the seeds were harvested in stages, dried, threshed, stored in a ventilated and dry place, and the roots of Isatis indica were lignified and they could not be used as medicinal materials.
IV. Pest Control
1. Disease. There are mainly downy mildew and root rot. The leaves of the downy mildew were pale green lesions. On the back of the disease, white or gray moldy leaves appeared on the back of the leaves. When the leaves were severe, the leaves died; root rot mostly occurred in the rainy season, causing the roots to rot, causing the death of the whole plant. Prevention methods: The main agricultural control, and grass, legumes rational rotation, close planting, improve ventilation and light conditions, found that diseased plants in time to remove out of the field, concentrated deep buried; also available 65% Dyson Zinc or 77% can be sprayed or irrigate WP.
2. Pests. There are mainly cabbage caterpillars and diamondback moths. The cabbage caterpillars bite the leaves, resulting in holes or nicks in the leaves, leaving only the veins in severe cases. The diamondback moths bite the leaves and cause the "skylight" in the early stage, causing nicks and holes in the later period, leaving only reticular veins. With diflubenzuron 3, BT emulsion, 90% trichlorfon 1000 times spray control.
V. Harvest processing
1. Daqingye. The spring sowing is harvested 2-3 times a year for the first time in early June; the second time is in early August, but it is not suitable for harvesting during the hot weather season in order to avoid causing plant death; the third time in October In the mid-to-root harvesting before harvesting, harvest should be sunny, the knife edge 1-2 cm from the ground, cut yellow leaves and impurities after cutting, immediately dried, avoid stacking during the drying process, so as to avoid fever, black, metamorphosis, each About 200 kilograms of dry leaves per mu are dried and placed in a dry, ventilated place to prevent mildew.
2. Banlangen. Rooting in late October, due to the deeper roots, the first to dig deep trenches at the time of harvest, dig along the trenches, so as not to cut roots, remove stems and leaves on the ground and soil, drying into 78% dry, Into a small bundle, and then drying to dry, placed in a dry place to prevent mildew, producing 200-250 kilograms of finished product per mu.
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