1. Site selection and construction of greenhouses Polyploid dandelion high resistance to pests and diseases, the temperature, humidity, light requirements are not very strict, ordinary facilities to meet their environmental requirements. The site selection of the greenhouse requires leeward, sunny, flat land, fertile soil, water protection and good drainage facilities. In order to facilitate collection and management, an area of ​​300-500 square meters is appropriate. 2. Cultivation methods (1) Seed live method. This method has a short production cycle and quick results, and can be harvested and listed 70 days after sowing. Drilling and sowing can be done by pouring water from the bottom of the foot and soaking the seed evenly after soaking the water. After 667 square meters (1 mu), about 500 grams of seeds are required. After sowing, 1.5 millimeters of fertile soil are spread with fine sieves to keep the ground temperature. 4-8 days to fully seedlings. When the height of the seedlings is 10 cm, the crowded seedlings should be removed. When the seedling height is 20 cm, the seedlings will be set. The spring sowing will be 20 centimeters and 20 centimeters, the autumn sowing will be 15 centimeters and 15 centimeters, and the 667 square meters will be seedlings with 15,000 to 20,000 seedlings. Discard 1/2). (2) Spring transplanting method. The 15cm high seedlings in the seedbed were excavated, sized and graded, 3/4 length leaves were cut off, and the seedlings were planted vertically at 25cm and 30cm in an unused greenhouse or in a field. The seedlings were planted vertically, and the soil was not buried in the water. 1 - 2 times, after four or five months of growth in the field, polyploid dandelion grows strong, the roots are developed, and individual plants generally reach 500-1000 grams. (3) Mother-root transplanting method. This method will be carried out when the land will be frozen. The mother root grown in Daejeon will be excavated and planted in a greenhouse at 25 cm and 25 cm. About 10,000 square meters will be planted with about 10,000 plants, and the leaves can be harvested one month after planting. 3. Fertilizer and water management To ensure high quality and high yield of polyploid dandelion, better fertilizer and water protection is required. No matter what kind of cultivation method, 667 square meters must be increased by more than 5,000 kg of organic fertilizer, more than 50 kg of multiple compound fertilizer, and the seedlings should be transplanted. Watering 2 times, when the land see dry timely loose soil, promote hair roots slow seedlings, the normal growth period of watering per month is not more than 1 times, the plastic film cover the top 10 days before fertilizer watering, 667 square meters of urea 20 kg . Into the cutting period, each cutting 1-2 times watering 1, followed by special fertilizer 10 kg of leafy vegetables, the time is appropriate after 10 days of cutting vegetables. 4. Control of temperature, humidity, and light The greenhouse dandelion cover film time After the soil is frozen, the wilt leaves are cut off and can be used as high-quality feed additives or Chinese herbal medicines. 1 to 10 days for the thawing budding period, the temperature is controlled at 20-35 °C is appropriate, a large number of buds sprouted during this period, 10-25 days for the blade long-term, temperature control at 15-30 °C, the light should not be too strong, try to reduce Humidity, during which the blades can reach more than 30 cm, 200-300 grams of blades can be harvested per plant, large plants can be more than 600 grams, in order to extend the harvest period, through the shading, ventilation to reduce the temperature and humidity within the shed, the temperature to 3 - 10 °C is appropriate. 5. Harvesting time is the best in the morning with dew and temperature of 3 - 5 °C. The method is to hold the plant in one hand and sharply cut it with a sharp knife in the other. If the plants are too large, they can be held with both hands, and the other person can help to cut off the yellow leaves and leaflets. They should be tightly lashed in 250 grams and drained neatly in a foam box of 50 cm, 30 cm, and 20 cm in length and covered with plastic wrap. Each box has a net weight of 5 kg, which is tightly closed and sealed with plastic strips. The preservation period of the whole box can reach over 10 days at room temperature in winter. 6. Notes (1) The use of pure polyploid dandelion can ensure high quality and high yield. (2) Time and frequency of cutting According to the flexible arrangement of the market, the summer and autumn seasons are not allowed to be cut, and it is necessary to lay a foundation for high quality and high production in the coming year.
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