How to strengthen the management of vegetable seedling raising in cold weather?

In winter, the weather is cold, the sunshine time is short, and there is a lot of smog, which is not conducive to the growth, flowering and fruiting of vegetable crops, and the growth and harvest period is delayed. At this time, the vegetable production is mainly concentrated in the shed and seedling shed, which is the key period of vegetable management in winter stubble and the suitable period for vegetable seedling and sowing in spring stubble next year. Cultivate seedlings in early spring next year

Tomato, eggplant, pepper and other solanaceous vegetables?

in early or mid-December, seedlings were raised in a shed with good daylighting and heat preservation, and seedlings were raised in 5 holes or 72 holes, with peat and vermiculite as substrates. If the ground temperature is lower than 15℃, a geothermal heating and temperature controller should be installed to increase the ground temperature. Select excellent varieties with early maturity, good quality and strong disease resistance. Do a good job of soaking seeds, choose sunny days for sowing, sow a budding seed at each hole, and multicast a seed at 5 ~6 holes on the edge of each plate for the convenience of replanting seedlings; Water and topdressing in time during seedling raising to increase light. Generally, the seedling age is 5-6 days, and it is planted indoors in early and middle February.

leafy vegetables such as cauliflower, lettuce, celery, lettuce, etc.

In mid-December, seedlings were raised in greenhouse or shed. 128 holes or 72 holes were used to raise seedlings, and peat and vermiculite were used as substrates. Water and topdressing in time during seedling raising to increase light. Generally, the seedling age is 5 ~7 days, and it is planted in shed or arch shed, greenhouse and other facilities from February to March, and it is supplied to the market in spring.

do a good job in heat preservation and cold protection of the shed

carefully check the heat preservation of the front roof, south foot, back slope, back wall, doorway, rear window, cold trench and air outlet of the greenhouse, and timely measure the temperature and ground temperature in the greenhouse at different times such as early morning, noon and night. The suitable temperature of tomato and other warm crops is 23℃~3℃ during the day, 15℃~18℃ at night, and the ground temperature is 2℃ ~ 22℃. The suitable temperature for cold-tolerant crops such as celery is 2℃~23℃ during the day, 1℃~12℃ at night, and the ground temperature is about 15℃.

for the greenhouse where the temperature can't meet the requirements of crop growth, cold-proof and heat-preservation measures should be taken as soon as possible in the weak heat-preservation position, and the temperature can be increased by using multi-layer covering in the greenhouse, double-layer covering of grass or heat-preservation quilt outside the greenhouse. In case of extreme cold weather, temporary heating measures such as heating burning block, electric heating furnace, Yuba bulb and covering the grass with two layers should be taken to avoid freezing injury.

Precautions for management of shed in snowy days

Clear the snow on the shed in time in snowy days, so as to prevent the snow from melting on the grass mulch or thermal insulation quilt and reduce its thermal insulation effect. After stopping the snowfall and on cloudy days, under the premise of ensuring that the temperature in the greenhouse is above 12℃, the grass can be uncovered around noon to make crops receive scattered light. In case of cloudy and sunny weather for a long time, the grass should be beaten one by one, or the heat preservation should be rolled up by half to prevent the plants from wilting due to too strong sunlight. Farming operations such as topdressing, watering, pruning and fruit thinning cannot be carried out in snowy days and cloudy days. For some greenhouses with large span and poor firmness, the scaffolding should be supported and strengthened in time to prevent the shed from collapsing when it snows.