What
is Kora?
In
winter, the night temperature gradually decreases and the humidity in the air
decreases. When the temperature is 12 degrees Celsius, the humidity in the
atmosphere reaches 100%. When the temperature drops below 12 degrees Celsius,
the moisture in the air begins to condense on the ground and plant leaves. This
moisture is called dew. When the temperature drops further below 4 degrees
Celsius, dew begins to freeze in place. This thin layer of snow is called
hoarfrost.
Kora
is of two types-
1.
White frost
2.
Black Frost
When
the temperature reaches 0 degrees, you usually see a white sheet of snow lying
on the grass in the field or on the roadside, and it is called white frost in
the morning, and it is 1 hour after sunrise. ends up.
Black
frost usually occurs when the temperature drops below minus 2 and the humidity
in the air is very low, the water in the leaves of the plant freezes and the
cell wall ruptures, causing the plant to wither and turn black.
When
there are clouds during the day, they prevent sunlight from penetrating the
ground, keeping it chilly and increasing the likelihood of frost. But if there
are clouds at night, the heat released from the ground hits the clouds and
returns to the ground, which keeps the ground warm and reduces the chances of
frost.
If
the night is clear and not cloudy at all, the heat emitted from the ground goes
up and the chances of hail increase.
The
earth becomes cooler after sundown when cold winds from the north are blowing
in the evening, which increases the likelihood of lightning. However, if winds
are still blowing into the night, the mixture of warm and cold winds lessens
the likelihood of frost.
The delivery system in the water and food channels of the plant is stopped by the frost, which also halts the process of food production in the plant by freezing the water within the plant cells, rupturing the cell wall.
If
this process continues for a long time, the leaves of the plants get burnt. New
leaves and branches are most affected by scab.
Roots are the most affected in case of frost because the frost directly affects the soil. The temperature is lower near the ground and if the air circulation in the ground is not good, the damage is more.
