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The cultivation and management of Isatis root
Due to the spread of the global flu epidemic, which has a period of 5 to 6 years, the incidence of upper respiratory tract in many regions is higher than historical levels. In addition to the prevalence of SARS in the spring, Banlangen has suddenly become hot and the market price has risen sharply. Currently, it is a base for medicinal plants and the majority of farmers. GAP is a good opportunity to grow and grow. The cultivation method is firstly land selection and site preparation. In view of the warm and cool environment of Banlangen, and fear of embarrassment, it also chose sandy loam with flat terrain, well-drained and loose soil. It can be planted on inland plains, alluvial soils, hillsides, and river banks. Before sowing, it is necessary to plow 20-40 cm deep, and combine the land with 250kg of compost or manure, 50kg of superphosphate, and 1000kg of plant ash. Areas where there is less rain can be used as flat ridges, areas where there is more rain, high enthalpies, 130 cm in width, and 15-30 cm in height. Then sowing. Spring sowing, summer sowing can be. Spring sowing is conducted from Qingming to Lixia (early April to early May), and summer sowing is conducted from Xiaoman to Xiazhi (late May to mid-June). Spring sowing is better. Seeds should be soaked in warm water of 30°C to 40°C for 4 hours before sowing, remove and dry, and mix with fine sand for sowing. Broadcasting or seeding can be done, and there are many drillers in actual planting. Drilling is conducted at a row spacing of 20-25cm, and the depth of the ditch is 2cm. The seed is sown and then the earth is covered. The height of the earth-covered soil is equal to the height of the earthworm. The seed amount per acre is 1 to 2kg, and seedlings can be produced 5 to 7 days after sowing. Field management When seedling height 7 ~ 10cm when the thinning, seedling height 12cm Dingmiao, spacing 7 ~ 10cm. When weeding, the first cultivating and weeding will be carried out. After every half-month to one-month weeding, keeping the field free of weeds will benefit the growth of the leaves. When the leaves grow up to be sealed, simply remove the big grass. Post-emergence combined with cultivator weeding can be applied once to human fecal urine, the application rate per mu is 1500 ~ 2000kg. After each leaf collection, fertilizer should be topdressed with 2000kg of excrement per acre, and ammonium sulfate (5-7kg) can be used to facilitate multiple new leaves. After summer sowing, if the weather is dry, it should be filled with water. During the rainy season, it is necessary to pay attention to draining water at a proper time to prevent water accumulation. The main pest control diseases are root rot, downy mildew, sclerotinia, and white rust. Root rot mostly occurs in the rainy season. In the early stage of disease, 50% carbendazim 1000 times solution or 70% thiophanate-methyl 1000 times solution is used to remove the diseased plant and burn out. One of the methods of prevention and control of downy mildew is to clear the fields in time after harvest, centralize the burning of diseased plants, carry out crop rotation, reduce the humidity in the field and remove water, and spray the first 1:1:1100 Bordeaux mixture or 65 in the early stage of disease. 5% of SONSEN Zinc 500 times, spray once every 7 to 10 days, even spray 2 or 3 times, can also be sprayed with 40% diethylaluminum phosphate 200 to 300 times, spray once every 7 days, even spray 2 or 3 times . The main prevention and control method of sclerotinia is to carry out crop rotation. Early application of phosphorus and potassium fertilizers can increase disease resistance, reduce moisture and prevent flooding, and apply lime sulfur mixture in the roots of plants. The prevention and control of white rust is to spray 1:12 Bordeaux mixture at an early stage of the disease. The crop must be protected from cruciferous crops such as cabbage, rapeseed, and radish. Insect pests mainly include cabbage butterfly and peach aphid. The cabbage butterfly was the most serious from June to July. It can be sprayed with bio-pesticide BT emulsion 100-150 g or 90% trichlorfon 800 times per mu. Myzus persicae can be sprayed with 50% Koji Loose Cream 1000x or 40% Dimethoate 1000x. China Agricultural Network Editor