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Rapid propagation of virus-free hawthorn seedlings
1. Introduce improved varieties. In the dried production areas of Hawthorn, the introduction of the promotion and processing type of detoxified hawthorn Xushu 18 is mainly used, together with the edible-type virus-free hawthorn Beijing 553. Convenient transportation, proximity to the market area, introduction and promotion of edible detoxification beggars Beijing 553. Seed potato selection of 100 to 150 grams / medium fast is appropriate. 2, seedbed settings. Seedlings choose leeward sunny, fertile soil, vegetable garden. Mu 50 kg of ternary compound fertilizer and 20 kg of urea were used as base fertilizer to plow till flat. According to the width of the plastic film, it is made into a width of 1 meter, and a 0.4 meter walkway is left between the concrete and the concrete. 3, row seed. The scheduling period is mid-March. Before sowing seeds, they should be soaked in 1% carbendazim solution and soaked for about 15 minutes. On the raft on the row spacing of 0.33 meters ditch, groove depth and seed potato length equal to the oblique row of seed germs after disinfection in the ditch, the spacing of the potato block to connect without overlapping is appropriate, after the row of seedlings irrigated with water. Then covered with fine soil, the thickness of the soil layer is preferably not exposed potato block. After covering with the mulching film, the mulching film inside the seedbed is covered, and then the arch shed is put on and covered with a film to form a double film seedling. 4, seedbed management. Since it is a double-layer film, it is greatly affected by weather changes in the early spring. In case of overcast weather, it needs to be covered with straw for insulation and the straw is removed on a sunny day. When the potato seedlings are unearthed, the plastic film is peeled off to prevent sprouting or burning of young shoots. When the temperature in the arch shed exceeds 35°C, the film at both ends of the arch shelter is cooled and ventilated; the seedlings are grown to the seedling growth stage before the seedling is cut. The bed temperature should be maintained at around 26°C. When the seedling height is 0.2 meters or more and there are 6 to 7 nodes, the hardening seedlings can be transplanted after 2 to 3 days. After cutting the seedlings, 0.5 kg of urea was applied per square meter on the 2nd day, and the water was poured, and then the plastic film was covered to promote the increase of the bed temperature. When the potato shoots grow to 6-7 knots, cool down gradually and see the second cropping seedlings after photosynthesis. 5, cutting period. Generally, the seedlings will be planted on or about March 15, and the first crop will be cut on April 20, and the second will be on May 5. With the increase of temperature, timely management, sufficient water and fertilizer, after every 7-10 days can be cut once, until the end of June cut about 8 times. 6, nursery gardening technology. The first cut of the seedlings around April 20 can be planted in the nursery as seedlings and then expanded. General requirements nursery Mushi Sanyuan compound fertilizer 50 kilograms, urea 20 kilograms, high-quality farmyard fertilizer for about 3 square base fertilizer, tiller after flat leveling by 0.5 meters row ridging, ridge height 0.3 meters, spacing of 0.17 meters, the number of acres 7500-8000 strains, 1 mu of land can provide 40,000 virus-free hawthorn seedlings. China Agricultural Network Editor