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The difference between frost and frost in farming

DailyBird Culture 2021-10-09 1 0
The arrival of

frost term means that winter is about to begin. At this time, the weather is getting colder and the first frost appears in the Yellow River Basin, so it is called frost. During the frost season, some areas in China are still in the busy season of the third autumn, so special attention should be paid to prevent frost disasters. Then today's old yellow calendar will introduce you to frost farming: the difference between frost and frost.

霜降与霜冻的区别

from the surface meaning, frost is gradually cooling and beginning to frost. To be exact, frost does not fall from the sky, but a white loose ice crystal formed by the direct condensation of water vapor near the ground or ground objects. With the advent of frost, the crops that are not resistant to cold have been harvested or will stop growing, and the plants and trees begin to turn yellow, showing a scene of late autumn.

frost refers to that in the growing season, the night soil surface temperature or the temperature near the plant canopy drops below 0 ° C in a short time, the plant surface temperature drops rapidly, the water in the plant freezes, the metabolic process is damaged, and the cells are squeezed by ice. When frost occurs in

and

, plants are endangered because of low temperature, not just because frost causes harm to plants. If the relative humidity of the air is low, you may not be able to see "white frost", and frost will also occur. Usually, people call the frost that cannot see "white frost" as "black frost".

and

show that "frost" and "frost" are two different concepts, and frost is only a solar term; Frost is associated with plant damage. Where there are no plants, there will be no frost. According to the season of frost, it can be divided into early frost and late frost.

early frost, also known as autumn frost, refers to the frost that occurs when autumn crops are not mature and open field vegetables are not harvested. With the passage of season, the frequency and intensity of autumn frost increase gradually.

and

late frost, also known as spring frost, is the frost that occurs during the seedling stage of spring sowing crops, the flowering stage of fruit trees, and after the rejuvenation of winter crops. With the increase of temperature, the frequency and intensity of late frost gradually decrease, but the later it occurs, the greater the harm to crops. The start and end time of frost in

and

are different due to different terrain, altitude and latitude. Generally, early frost (i.e. autumn frost) begins to appear. The higher the altitude, the earlier the latitude, and the earlier the low-lying (Valley) land, and vice versa; The end time of late frost (i.e. spring frost), the lower the altitude, the earlier the latitude, and the earlier the slope land is than the low-lying land, and vice versa. The formation of

and

frost has three aspects: (1) advection frost. Due to the strong cold air invasion, the temperature drops to 0 ° C or below 0 ° C, resulting in the formation of frost. This kind of frost has a wide range of invasion and a large cooling range. (2) radiation frost. In a clear, windless or breezy night, radiation cooling reduces the temperature of the ground or near earth objects to 0 ° C or below, resulting in the formation of frost. The scope of this frost is relatively small. (3) advection radiation frost. Frost caused by cold advection and radiation cooling. This frost has a serious impact. In addition, there is a kind of depression (Valley) frost produced in local areas. At night, the air near the ground layer cools, and the cold air on the slope slides and accumulates in depressions or valleys to form frost, which occurs more than in autumn. This is consistent with the Qinghai agricultural proverb of "frost hit depression".

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