Growing vegetables on cloudy days

Science and technology promote productivity, and now more and more greenhouse vegetables are entering our table. So, what should we pay attention to in heavy snow solar terms? These 24 solar terms take you to learn the vocabulary of heavy snow and solar terms, grow vegetables and raise seedlings to keep warm and cold. Let's have a look.

Heavy snow is the 2 1 solar term of the lunar calendar. The northern region will be affected by cold air, and heavy snowfall often occurs, causing snow on the ground. At this time, the lowest temperature in most parts of China has dropped to 0℃ or below. Although it has entered a snowy winter, the greenhouse is full of spring. At this time, vegetable production is mainly concentrated in solar greenhouse and seedling shed.

Cultivation of solanaceous vegetables, such as 1, tomato, eggplant, pepper, etc. in early spring next year, and seedling raising in sunlight greenhouse with good daylighting and heat preservation performance from mid-June to May 438+February. Soak seeds in warm soup and chemicals, and use peat and vermiculite as substrates to raise seedlings in 50-hole or 72-hole trays. If the ground temperature is lower than 15℃, geothermal heating lines and temperature controllers should be installed to increase the ground temperature. Water and topdressing in time to increase the light when raising seedlings. Generally, the seedling age is 50-60 days, and it is planted in solar greenhouse in mid-February. 2. leafy vegetables, such as cabbage, cauliflower, lettuce, celery, lettuce, etc. In the middle of June, 5438+February, it was raised in greenhouse or small arch shed. Seedling was raised in 128 or 72 plug, and the substrate was peat and vermiculite. Water and topdressing in time to increase the light when raising seedlings. Generally, the seedling age is 50-70 days, and it is planted in solar greenhouse or small arch shed, greenhouse and other facilities in February-March, and supplied to the market in spring.

To do a good job of heat preservation and cold protection in solar greenhouse, we should carefully check the heat preservation of the front roof, south foot, back slope, back wall, doorway, back window, cold ditch and exhaust fan opening of the greenhouse, and measure the temperature and ground temperature in the isothermal room at different times 10 cm in the morning, at noon and at night. The suitable temperature of tomato and other thermophilic crops is 23℃-30℃ during the day, 15℃- 18℃ at night, and the ground temperature is 20℃-22℃. The suitable temperature for cold-tolerant crops such as celery is 20℃-23℃ in the daytime, 10℃- 12℃ at night, and the ground temperature is about 15℃. For the greenhouse whose temperature can't meet the requirements of crop growth, the reasons should be carefully analyzed, and the cold-proof and heat-preservation measures should be taken as soon as possible for the parts with weak heat preservation. Measures such as multi-layer covering, double-layer covering with grass or thermal insulation quilt can be taken to increase the temperature. In case of short-term extremely cold weather, temporary heating measures such as heating burning blocks, electric heating furnaces and Yuba bulbs should be taken to avoid frostbite.

Do a good job in the management of solar greenhouse 1 and adjust the suitable growth conditions. At this stage, adjusting the appropriate temperature, humidity and light in the greenhouse is the most important work, which is related to whether the plants can grow healthily, whether the fruits can set and expand rapidly, and the infection of diseases. Therefore, it is necessary to adjust the indoor environment so that crops can grow and develop in a suitable environment most of the time. First of all, according to the weather and indoor temperature, cover the plastic film in time, but we must insist on seeing more sunshine and drying it in time, especially after watering and cloudy days. Thermophilic crops such as tomato, cucumber, eggplant and pepper can be released when the room temperature reaches 30℃, sealed at 28℃ and covered at 20℃ at night; Secondly, wipe the shed film frequently to increase the light transmittance; Third, adjust different air humidity according to different crops. The suitable air humidity of leafy vegetables such as pepper, cucumber and celery is 60%-85%, and that of tomato and eggplant is 45%-55%. In case of cloudy day, dry sawdust and rice husk prepared in advance should be sprinkled on the surface between rows to absorb certain moisture to avoid diseases caused by excessive humidity.

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