Large-arch shed spring radish cultivation technology
1. Selection of good varieties
The temperature in early spring is low and unstable, and the cultivation of spring radish must use good varieties that are resistant to convulsions. At present, it is mainly suitable for white radish cultivation in large arch sheds. The varieties are: early spring Dagen, Baiyuchun, Chunzaosheng, Chunyu No.1, Chunyu No.2 and so on.
2. Soil preparation and fertilization
Radish is suitable for planting on land with loose soil, fertile soil and uncultivated cruciferous vegetables. Deeply flipping the land about 35 centimeters before winter to kill some underground pests. 10-15 days before sowing, about 5,000 kilograms of decomposed manure per 667 square meters, 100 kilograms of decomposed cake fertilizer, 50 kilograms of NPK compound fertilizer, 50 kilograms of carbendazim WP, 1.5 kilograms, mix well after application Then turn the sheds over and over again. Ridges in the north-south direction, the ridge distance is 80 cm, the ridge top is 40 cm wide, and the ridge height is 20 cm.
3. Suitable sowing
The large shed sheds the spring radish, which is usually sown in mid-February. The early temperature is low, and the radish seedlings are easily twitched through the vernalization stage. Sowing should be carried out in the morning on a sunny day, using a hole sowing, the depth of the hole is 1.5-2 cm, the water is first watered in the hole, and after the water seeps, three to four seeds are spotted at each hole. 2 rows per ridge, 30 cm in small row spacing, 50 cm in large row spacing, and 25 cm in plant spacing. After covering the soil, the ridge surface is covered with a mulch film to facilitate heat preservation and moisturization, and promote early seed germination.
4. Scientific management
(1) Temperature and light: The large arch film is buckled 15-20 days before sowing. Before the radish emerges, it is generally not ventilated during the day, and a layer of grass sputum is added to the shed film at night to keep warm. Grasshoppers should be properly exposed to cover the night, to ensure that there is sufficient light every day, to maximize the temperature of the greenhouse, and to promote early emergence of radish. After the seedlings are unearthed, the seedlings are ruptured in time, and the minimum temperature in the night shed is controlled at 8-12 °C. When the shed temperature exceeds 28 °C during the daytime, the temperature is lowered and kept at 20-25 °C to prevent the radish seedlings from growing at a high temperature and forming high seedlings. The fleshy roots are inflated, the daytime temperature is maintained at 18-20 °C, and the nighttime is controlled at 10-15 °C. When the minimum temperature outside the night is kept above 15 °C, the grasshopper can no longer be covered.
(2) Early seedlings: After the radish seedlings are out, the seedlings are planted, and the seedlings are fixed when there are 2 true leaves. Or when the radish seedlings grow 2-3 true leaves, the seedlings are fixed at one time.
(3) Fertilizer and water management: The large shed spring radish seedlings are generally not watered, so as not to lower the ground temperature. When the “breaking belly†is poured, the water is poured once, and the compound fertilizer is applied for 10-15 kg per 667 square meters. The succulent roots are poured twice in water, and 15-20 kg of compound fertilizer is applied with water. In the future, according to the growth of radish, watering and topdressing as appropriate, keeping the ground dry and seeing wet, stop watering 5-7 days before harvest.
(4) Timely harvesting: The harvest of spring radish in the large arch shed should be determined according to the variety and sowing date, and it is generally suitable for the full expansion of the fleshy root. Harvesting is too early, the yield of radish is low, the price is too late, and the income is reduced.
Pest control pests and diseases The main pests and diseases of the spring radish are: downy mildew, viral disease, soft rot and black rot, aphids, cabbage caterpillars and so on. Downy mildew can be controlled by 25% metalaxyl WP 500 times or 72% gram 600 times liquid leaf spray. On the basis of prevention and control of aphids and reduction of drug-transmitting mediators, the virus disease is prevented by using 1.5% phytopathogenic 1000 times solution or 20% virus A WP 500 times solution at the beginning of the disease. Soft rot and black rot can be controlled by 72% agricultural streptomycin sulfate or neomycin 3,000 times solution. The mites are controlled with 50% anti-Pulcan WP 2,000 times or 10% imidacloprid 1 000 times. The cabbage worm can be controlled with 5% taibao or 5% Nongmeng emulsifiable concentrate. The above pest control measures are sprayed once every 7-10 days for 2-3 consecutive times.
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