What does frost on plants do?

Frost is the condensation phenomenon of water vapor (that is, gaseous water) at a very low temperature, which is very similar to snow. On cold winter mornings, outdoor plants usually frost. This is because plants dissipate heat slowly at night, the ground temperature is particularly low, and the water vapor is not emitted quickly. When it still gathers on the surface of plants, it will freeze and form frost. Scientifically speaking, frost is made up of ice crystals, similar to dew. When the relative humidity in the air reaches 100%, water is separated from the air. The only difference between the two is that the dew point (the temperature at which water vapor liquefies into dew) is higher than the freezing point, while the frost point (the temperature at which water vapor condenses into frost) is lower than the freezing point, so frost will only appear when the temperature near the surface is below zero degrees Celsius.

Freezing injury is a common term in agricultural disasters in cold regions and high mountains. In order to avoid freezing injury of vegetables after frost, it is necessary to rely on greenhouse cultivation techniques to improve agricultural output.

In China's solar terms, the annual solar calendar of 65438+1October 23rd (see the twenty-four solar terms in Song Dynasty) is the beginning of the first frost.