In blizzard days, in order to avoid low temperature hazards for shed vegetables, it is recommended that vegetable growers start with the following aspects:
Increase shed temperature
Special locations are provided for additional protection at the entrance of the greenhouse, under the air vent, and the front face of the greenhouse. Compared with other places in the greenhouse, these three places have more chances to be exposed to cold air and have a long low temperature. In winter, additional insulation work in this area should be strengthened. The specific operation is to hang a non-woven curtain at the entrance of the greenhouse, and hang a film of 2 to 3 meters along the drain on the back wall after entering the shed, the height of which is the same as the hanging wire to avoid direct damage to the plants by the cold wind; a windshield film is installed under the air outlet, It is used to buffer and prevent cold wind; the front face is hung with a film on the inner side or covered with old grass thatch or non-woven fabric on the outer side to enhance night heat preservation.
Spraying products that improve resistance to stress, such as antifreeze, or functional foliar fertilizers, such as seaweeds, amino acids, and chitin, can improve the ability of vegetables to resist low temperatures. However, it is necessary for vegetable farmers to pay attention to the weather forecast in time, and spray them in advance before the arrival of the cold current to achieve a good anti-stress effect.
For the shed to be heated at night in the seedling field, the seedlings have poor resistance to stress. In winter, the shed heat preservation is necessary. Large-scale equipment is commonly used, such as semiconductor electric boilers, carbon fiber heating panels, air conditioners, etc., while ordinary sheds commonly use combustion blocks, Solid ***, etc., heated in advance the night before the cold wave to prevent low temperature hazards.
At the same time, if it is only to lower the temperature instead of continuous cloudy days, watering can also be carried out before the arrival of low temperature. The characteristic of large specific heat capacity of water can also play a certain soil insulation effect. In addition, after the chilling injury of vegetables occurs, the next day should be slowly exposed to light and slowly warmed up, such as pulling grass thatch or pulling up 1/3 to 1/2 of the insulation quilt to prevent the affected tissue from suddenly increasing in temperature. It is more difficult to return to normal.
Pay attention to light up in low-light weather
In solar greenhouses in different geographic latitudes, the indoor natural light time and light intensity are different in winter; the natural light intensity is unstable due to the influence of clouds in the same solar greenhouse; different types of crops require different light intensity; the same crop has different growth stages Different requirements for light time and light intensity. Therefore, the author specially reminds: When the facility vegetable protection area encounters continuous cloudy and haze weather, the illuminance and layout of the fill light must be arranged reasonably.
Because the higher the latitude, the shorter the daytime in winter, the weaker the light, and the more indoor crops like strong light and long light, the higher the density of the fill light should be, the stronger the illumination. Generally speaking, take the installation of 220v/40w agronomic sodium bulb or 220v/36w lamp as an example. It can illuminate 10 square meters in daily non-natural light time, and 30 square meters in low light. The blind corners of the two gable walls can be illuminated by pressing Install sunlight lamps without natural light. In the layout of the fill light, the indoor illumination is uniform as the principle. Each light installed is equipped with a two-level switch of strong light and general light. It should be based on the influence of clouds in the greenhouse, weak light, cloudy and snowy weather, weak light, If there is no light behind the grass curtain, adjust the illumination intensity of the fill light to meet the needs of crops.
At the same time, under different circumstances, the application method of the fill light is different. In the case of continuous cloudy weather, you can turn on the strong light switch and irradiate the light throughout the day to avoid root wilting. During the nursery period, turn on the lights 1 hour before sunrise in the morning to 1 hour after sunrise, 4-6 hours after noon, and turn on the half-light intensity switch, so that the light of the sunlight lamp and the sunlight will form 9-12 hours of sunshine together , To cultivate strong seedlings. If it is the fruiting period, when the natural light intensity is below 20000 lux, turn on the fill light.
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