The short growing period of rapeseed is 40 to 50 days. It is easier to cultivate and manage. Variety selection: should select winter strong, cold-resistant, storage-resistant, disease-resistant, high-yield green rapeseed, Nannong dwarf yellow, April slow and May slow and other fine varieties. Cultivate strong seedlings: The rapeseeds listed during the Spring Festival are mostly intercropping and fast-growing leafy vegetables, which must be transplanted and transplanted. The seeds were first soaked in water at 25°C for 3 to 4 hours, and then germinated at 20°C for 24 hours to germinate. The seedbed is applied with 12 kg of high-quality rotting organic fertilizer per square meter, and then a small amount of ternary compound fertilizer is added. The plough is cultivated and ploughed, watered and sowed, 15 to 20 grams of seed per square meter can be sprinkled, and the cover soil is 1 cm. Straw grass moisturizing. After sowing, the temperature was maintained at 20°C~25°C, and then decreased to 15°C~20°C after emergence and 10°C at night. Although rape is more cold-resistant, the temperature should not be too low to prevent premature bolting. The seedlings can be sprinkled with a layer of finely grounded soil when there is no dew. For seedlings and time, the seedling distance should be kept at about 4 cm. After 30-40 days of seeding, seedlings will grow 3 to 4 leaves when they are planted. Twisting and transplanting: Generally, 5000 kg of cooked manure is applied per acre, and then 30 kg of diammonium phosphate is added. Then deep plowing is done. The width is 1 meter, and 5 rows of small ditch are opened. The seedlings are planted at a planting distance of 10 cm. Each acre is planted. 35,000 plants. The depth of planting is appropriate for burying in the base of the first true leaf petiole, and watering immediately after the planting is completed. The amount of water should not be too large. After the seedlings are tempered, the seedlings are slowly irrigated, and they can be ventilated appropriately. The daytime temperature is maintained at about 20°C and nighttime at 6°C to 10°C. Cultivate on sunny days 1~2 times. After the plants began to grow new leaves, 15 to 20 kilograms of ammonium sulfate or 10 to 15 kilograms of ammonium nitrate was applied per acre and watered immediately. When the base fertilizer is insufficient, it can be top-dressed in advance. In the winter when the cold current is relatively frequent, especially before the Spring Festival, a long period of rain and snow often occurs. When there is cloudy weather for several consecutive days, the temperature should be reduced appropriately to minimize the respiratory depletion, and special attention should be paid to uncovering the straw curtain. On the first sunny day after the cloudy day, if the sunlight is too strong, the rape can be wilted. At this time, some straw curtains should be covered immediately. After the rape is returned to normal, all the straw curtains will be uncovered. If aphids are found, they can be sprayed with 20% of fast kill 2500-fold or 2.5% of fleas 1800-fold. After harvesting and colonization, it can be harvested in 40 days, and it can be harvested in multiple times or in one harvest. Seven, adult fish caught. When the seedlings are kept for 3-7 months and their weight is greater than 30 grams, they can be listed and listed one after another. Drain the water to catch it, and after catching it, classify it by size, transport or freeze the live fish, and use other methods to process the export.
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