Chinese cabbage cultivation techniques in early spring

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Cixi County, Cixi, has been planted in early spring cabbage for 16 or 7 years. It was formerly planted in small sheds and planted in mid-March. There are several non-bathing varieties such as “Prematurity 5” and “Xiaoza 56”. 5 Monthly listing. In the 1990s, the introduction of "Chun Bao Huang," "Spring General," and "Golden Goose" and other ball-bearing varieties were planted in greenhouses, planted in January and February, and began to be listed in mid-to-late March, filling the gaps in the market. The price of more than 3 yuan, the output value of 4000-5000 yuan per mu. Due to the early spring low temperatures encountered in early spring, 800 acres of cabbage planted in small sheds have bolted to varying degrees, resulting in reduced yields. This year's planting area has been greatly reduced. The small sheds have almost disappeared in early spring, and only large greenhouses are planted. The cultivation techniques of Chinese cabbage in early spring are as follows: 1. Cultivation of greenhouses: Planting early-spring Chinese cabbage in greenhouses can be planted as early as the end of January. At the latest in late February, sowing early seedlings are affected by temperatures below 12 degrees, causing Chinese cabbage to pass through. The vernalization phase causes bolting. The sowing was too late and the temperature increased later, which was unfavorable for the ball. The nursery was raised with nutrients and covered by a small arch shelter at night to keep the night temperature above 12 degrees and the daytime temperature at around 25 degrees. 2. Transplanting: Deeply pour the soil, apply 50 kg of M.S. compound fertilizer as basal fertilizer, cover the land after flattening the land, then transplant, plant spacing 35-40 cm, planting density of 3000 mus, timely pouring after transplanting Set the root water. 3. Reapply lotus root fertilizer: Apply a quick-release nitrogen fertilizer in the lotus stage, apply 30-50 kg of ammonium bicarbonate in the Mushi, prompt the Chinese cabbage to quickly shoot the ball, fertilize the greenhouse to avoid high temperature, or apply deep nitrogen fertilizer to prevent ammonia poisoning. During the rosette period, we must also pay attention to soil moisture and timely irrigation and drought relief. 4, pest control: early spring pests lighter, but sometimes there will be aphids, leafhoppers damage, once the occurrence of the net once again available, insecticide treasure for prevention and treatment, the use of other pesticides should pay attention to whether it will produce phytotoxicity. For continuous cropping and high-temperature drying, if calcium deficiency disease occurs, calcium and boron foliar fertilizers are sprayed 3 times in a row every 5 days.