Traditional Culture Encyclopedia - Weather inquiry - How many degrees below zero can pepper freeze?

How many degrees below zero can pepper freeze?

Hello, pepper will be frozen when it encounters low temperature below 0℃ during its growth. There are four kinds of frostbite. First, a single plant in the seedbed is frozen; Second, before the seedlings were unearthed, they all froze to death in the ground; Thirdly, 3-4 true leaves above the growing point or cotyledon node are frozen, and the leaves are shrunk or dried; Fourth, in the later stage of plant growth, the temperature rises above 0℃, and symptoms begin to appear. At first, it is soaked in water, and pits appear on the surface of the fruit, which will rot after a while.

Preventive measures for freezing injury of pepper seedlings in winter

First, improve the seedling raising method

Adopting artificial temperature control seedling raising methods, such as electric hotbed and factory seedling raising, is an effective measure to solve the problem of seedling freezing injury.

Second, enhance the cold resistance of seedlings and avoid seedlings growing in vain.

Before the cold current comes, remove the plastic film as much as possible to let the seedlings get more light and exercise. During the period of rain, snow and low temperature, try to take advantage of sunny days to remove the grass cover and let the pepper seedlings bask in the sun. When it suddenly clears up after the rain and snow stop, cover several straw mats on the seedbed at intervals around noon to prevent the seedlings from wilting due to water loss. Seedbed soil is wet, and seedlings are vulnerable to freezing injury. Therefore, before the cold wave comes, it is necessary to control the watering of the seedbed. If the bed soil is too wet, you can sprinkle a layer of dry plant ash.

Third, balanced fertilization.

Increase the application of phosphorus and potassium fertilizer, and use cold-resistant agents at seedling stage. Spraying 0.5% ~ 1% brown sugar or glucose solution on seedlings can enhance cold resistance. Spraying 0.5% seafood chelated calcium fertilizer twice (7 days apart) at the 3 ~ 4 leaf stage to enhance the cold resistance.

Fourth, keep warm and prevent freezing.

The seedbed was covered tightly during the cold wave. When ventilated for a short time, it is necessary to prevent cold air from blowing directly into the seedbed to hurt the seedlings. Cover the grass curtain at night. You can spread the dead leaves of straw on the seedlings and remove them after the cold wave. The turf on the seedbed should be dry. On snowy days, clear the snow out of the nursery in time after the snow stops.