Multiple measures to prevent Frost injury of Flowers in greenhouse in Winter

In winter, there are many windy and snowy weather in the northern region, and at this time the flowers in the northern region begin to enter the greenhouse management stage one after another. The temperature in the greenhouse is low, the room temperature is low, if closed for a long time, coupled with poor management, it is easy to occur varying degrees of frost injury, wind damage and so on, light cases affect the growth of flowers, serious cases cause flower death, should be avoided.

(1) timely uncover the cover as early as possible when the temperature conditions permit, so as to promote the photosynthesis of flowers. In the deep winter, when the sun shines all over the shed in the morning on a sunny day, the temperature in the shed is generally not lower than 18 ℃. When the light is weak in cloudy or cloudy days, the grass should be opened in time so that the scattered light can enter, on the one hand, it can increase the temperature, on the other hand, because there is more blue-purple light in the scattered light, it is beneficial to photosynthesis. Do not uncover the grass for a long time, resulting in cold inside the shed and a sharp drop in temperature.

(2) the mulch should be covered with a small shed and a straw curtain in the greenhouse at night. Adding grass stalk or corn straw around the greenhouse at night can increase the temperature by 1 ℃ ~ 2 ℃. The temperature of the greenhouse can be increased by 2 ℃ ~ 3 ℃ by adding a thin layer on top of the original grass clover. Covering the original grass grass with a film can not only block the wind, but also prevent rain and snow from wetting the grass, thus reducing the heat loss caused by water evaporation. The flowers planted on the ground can also be covered with plastic film, and the soil temperature can be increased by more than 1 ℃ after mulching.

(3) the pool is insulated by digging a storage pool every few meters in the middle of the greenhouse, covering the bottom with plastic film, then filling it with clean water, and then covering the upper part of the pool with a transparent film (to prevent the moisture in the pool from evaporating and increasing the air humidity in the greenhouse). Because the specific heat of water is large, it can absorb heat at noon (at high temperature) and release heat at night.

(4) when heating encounters extremely cold weather, you can add stove or turn on heating in the shed, but when using the stove to warm up, you should pay attention to prevent flower gas poisoning, install chimneys to output gas outside the shed, and be careful not to ignite firewood and grass in the shed to increase temperature, because the smoke emitted from burning firewood and grass does great harm to flowers.

(5) to increase the application of fertilizer, horse dung, crushed grass and other brewed heat were applied in the shed to increase the ground temperature. The decomposition of organic fertilizer can release heat, and the appropriate application of organic fertilizer and phosphorus and potassium fertilizer can not only improve soil aggregate structure, increase soil temperature, provide nutrients for flowers, but also enhance the frost resistance of flowers.

(6) plastic film mulching or small arch greenhouse is cultivated in high ridge, which can be covered with plastic film on high ridge, which can increase the ground temperature by 2 ℃ ~ 3 ℃, while in flat cultivation, small arch greenhouse can be set up to increase soil temperature.

(7) the cold-proof ditch is dug in the south of the outside of the greenhouse and filled with thermal insulation materials such as horse dung, weeds and straw, which can prevent the ground temperature from losing outward and increase the ground temperature in the south of the greenhouse.

(8) before the cold current of the surrounding smoke comes, igniting the smoke around the greenhouse can prevent the heat around the greenhouse from radiating to the high air and reduce the heat loss.

(9) spraying antifreeze before cooling, spraying the stems and leaves of the plant with 400 × 700 times of antifreeze can play a role in preventing cold and anti-freezing.

(10) the plant ash is grayish black and has strong heat absorption ability. After it is uniformly scattered on the ground of the greenhouse, the ground temperature can be increased by 1 ℃ ~ 2 ℃.

(11) cleaning the greenhouse film to remove the dust, dirt and snow on the greenhouse film in time can increase the light and increase the temperature of the greenhouse.

(12) the double film is covered with another layer of film under the non-dripping film, because there is air between the two layers, the temperature in the shed can be significantly increased.

(13) hanging the reflective screen and hanging the polyester aluminized film on the north side of the greenhouse can increase the light in the greenhouse and increase the greenhouse temperature by 2 ℃ ~ 3 ℃.

Frost damage to flowers in greenhouse occurs from time to time in winter. Farmers should take preventive measures, control the temperature in the greenhouse, prevent the freezing of flowers in the greenhouse, and reduce the loss.