Principle of smoke prevention and frost prevention

The principle of smoke prevention and frost prevention is to protect plants by burning fireworks-like steam in the fields around crops. Smoke and smog will disperse a small amount of heat such as sulfur dioxide, which can produce a protective "smoke" in low temperature weather, so that plants will not be attacked by frost.

Fumigation method: accurately measure the wind direction, dig a small round pit with a depth of about 30 cm and a diameter of about 90 cm every 10 meter in the wind direction on the frost-proof plot, put down hay, and pile up wet grass as the fuming material. According to the forecast, when the temperature drops below 1℃ and above 0℃, it will ignite and smoke will emerge. Be sure to master the ignition time, neither too early nor too late. The smoke screen should last until the sun rises and the temperature rises again.

Anti-freezing measures

1, irrigation method

It can increase the air humidity near the ground, protect the ground heat and raise the air temperature. Irrigation can increase the air humidity near the ground, protect geothermal energy and raise the temperature. Because of the large heat capacity of water and slow cooling, the site temperature will not drop rapidly.

For small area garden plants, water spraying can also be used. The method is to spray water on plants continuously with sprinkler irrigation equipment 1 hour before frost comes. Because the water temperature is higher than the air temperature, when the plants are cold, the water will release heat, and the water temperature is higher than the freezing point to prevent frost, and the effect is better.

2. Covering method

It can not only prevent the attack of cold air from outside, but also reduce the loss of geothermal energy. Cover plants with straw, wheat straw, plant ash, weeds, nylon, etc. It can not only prevent the attack of cold air from the outside, but also reduce the loss of geothermal energy, and generally increase the temperature 1-2℃. Some dwarf plants can also be buried in the soil to prevent freezing injury. This method can only prevent a small area of frost, and its advantage is that it takes a long time to prevent freezing.