December 7 was a heavy snowfall, and the northern region was affected by cold air. Large snowfall often occurred, causing snow in the area. At this time, the minimum temperature in most parts of China has dropped below 0°C. Snowfall is frigid in winter, with short sunshine hours and high haze days. It is not conducive to the growth and flowering of vegetable crops, and the harvesting period is delayed. The vegetable production at this time is mainly concentrated in the solar greenhouse and the nursery shed. It is a crucial period for the management of overwintering alfalfa vegetables, and it is also a suitable period for sowing vegetable seedlings in the early spring next year. Cultivate young seedlings in early spring next year â– Good temperature Solanaceous vegetables Early spring pods The suitable sowing dates for tomatoes, eggplants, and peppers are December and mid-December. The greenhouse seedlings with good lighting and heat preservation performance were used, and 50 holes or 72 holes were used to raise the seedlings. Peat and vermiculite were used as substrates. If the ground temperature is lower than 15°C, a geothermal heating line and a temperature controller should be installed to increase the ground temperature. Selecting good varieties with early maturity, good quality, and strong disease resistance, eggplant should use “Jingqie 6†and “Haifeng Changqian 2â€; sweet peppers should use “Jingtian 3†and other varieties. Do seed soaking and seed soaking, choose sowing on sunny days, sow every germinating seed for each hole, and sow a seed at 5-6 points on each edge of the plate to make up for seedlings; watering topdressing and increasing light during seedling raising . The general seedling age is 50-60 days, and it is planted in the solar greenhouse in the middle and middle of February. â– Cabbage and leafy vegetables Cabbage, cauliflower, green cauliflower, lettuce, celery, lettuce and other vegetables are cultivated in the greenhouse or in small arches in mid-December. Use 128 holes or 72 points plug seedlings, peat, vermiculite as a substrate. During the nursery, watering fertilizer is applied in time to increase light. The general seedling age is 50-70 days, and it is planted in greenhouses or small sheds, greenhouses and other facilities in February-March, and will be available in spring. Solar greenhouses do a good job of keeping warm and avoiding freezing As early as this year's cold air comes, the winter temperature is expected to be lower than in previous years. Therefore, we must do everything possible to make the greenhouse warm and cold work. First of all, carefully inspect the insulation condition of the greenhouse's front roof, south foot, back slope, back wall, doorway, rear window, cold-proof ditch, and exhaust fan mouth, and measure the greenhouse in the morning at 6 am, 10 am, and 2 pm Temperatures and 10 centimeters of ground temperature values ​​for different periods of time, such as point, night, etc. For tomato and other thermophilic crops, the suitable growth temperature is 23°C-30°C during the day, 15°C-18°C at night, and 20°C-22°C for the ground temperature; the suitable growth temperature for cold-resistant crops such as celery is 20°C-23°C during the day and 10°C during the night. -12 °C, ground temperature around 15 °C. For greenhouses where the temperature does not meet the crop growth requirements, carefully analyze the reasons, and take measures to prevent cold and heat insulation as early as possible for weak insulation locations. Use multi-layer coverings, double-layer coverings outside the greenhouse, or insulation to increase the temperature. In case of short-term extreme cold weather, warming combustion blocks, electric heating furnaces, Yuba light bulbs, and two-story grasshoppers should be used to prevent frost damage. Solar greenhouses focus on daily management â—†Adjust the appropriate growth environment conditions First, according to the weather and the indoor temperature conditions, timely disclosure, cover, but must adhere to more light, timely release, especially after watering and cloudy days must be short-term ventilation wet. Tomatoes, cucumbers, eggplants, peppers and other thermophilic crops can be released at room temperature when they reach 30°C, closed at 25°C, and covered with cockles at room temperature at 20°C in the evening; Second, they often wipe the film to increase the light transmittance. Third, according to different crops to adjust the different air humidity, pepper, cucumber and celery and other vegetables suitable for air humidity 60% -85%; tomato, eggplant between 45% -55%. In case of cloudy days, dried sawdust, dried rice hulls, dried leaves, and other dry stalks prepared in advance should be sprinkled on the surface between the rows, which can effectively absorb the moisture in the shed and avoid the occurrence of indoor humidity and induce the occurrence of disease. â—† Strengthen plant adjustment and fruit management In time, the lateral branches and lower leaves, yellow leaves, and diseased leaves that grow in the plant are destroyed, and ventilation is strengthened. Tomatoes and cucumbers cultivated in winter and long-term seasons should be planted or continuously replaced to extend the fruiting period. 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