How to prevent freezing injury of wheat in extremely cold weather?

After wintering, the situation of wheat is that the weather gets warmer in spring, the soil freezes, and wheat gradually enters the vigorous growth period. The sudden drop of temperature often occurs in spring every year, and the low temperature of wheat in the East China Sea is prone to occur. If it is lighter, the leaves, tillers and young ears are frostbitten or inhibit the growth of wheat. Weight will cause the main stem, tiller and even the whole wheat seedling to freeze to death, which will lead to different degrees of wheat yield reduction in the later stage.

Generally speaking, after the warm weather in spring, the surface soil temperature suddenly drops below 0 degrees, and wheat is easily affected by the cold in late spring and the low temperature in the East China Sea. The influence of spring cold and low temperature in the East China Sea on wheat has two periods, one is jointing stage, and the other is floret differentiation stage of wheat seedlings. In the former period, spring cold occurred, which easily frostbitten wheat leaves and tender growing points, and in the latter period, it was easy to frostbite wheat tender ears.

In most cases, after wheat suffers from the low temperature in the East China Sea, Chinese farmers should take effective measures in time to eliminate the influence of the low temperature in the East China Sea as soon as possible. Only in this way can the late yield of wheat be guaranteed to the maximum extent.

Which wheat is easy to cause low temperature in the East China Sea due to late spring cold?

Compared with ordinary barley seedlings, barley seedlings that grow vigorously before winter and those that grow weakly later are prone to low temperature in the East China Sea due to the cold spring. In the aspect of royal jelly hair in winter, sowing time is too early, and high temperature before winter will lead to premature growth and development, and excessive growth and density before winter will consume a lot of nutrients in the body. This kind of wheat seedling is weak, seedless, weak in stress resistance and cold tolerance, and it is easy to have low temperature in the East China Sea when it meets spring cold. When the seedbed is weak, the sowing time is too late, and the barley can't meet the mother-in-law's standard before winter, so it is easy to have low temperature in the East China Sea. In addition, there is a lack of base fertilizer when sowing. Before winter, the wheat is irrigated with frozen water, and the wheat is not delivered. In the next spring, it is easy to overwinter and encounter spring cold.

For wheat areas where the temperature changes greatly in spring or it is easy to get cold in late spring, our farmers should not only classify Wang Temple and Yao Temple to publicize their mother-in-law, but also keep abreast of the weather changes in the coming week. Before the cold weather in spring is found in the next few days, the protection and management of wheat freezing injury should be carried out in advance.

Before the late spring cold 1- 1 day, when the temperature is high at noon on sunny days, water can be injected into the wheat field. Injecting water into the wheat field can make the water in the farmland soil absorb the heat of the sun's rays, thus improving the thermal capacity of the soil as a whole. When the cold spring comes and the temperature drops, the water in the soil will release a lot of heat to protect the wheat roots from the damage of the low temperature East China Sea.

What measures should be taken to prevent and improve the low temperature freezing injury of wheat?

For the wheat fields prone to cold spring and low temperature in the East China Sea, the management should focus on "control", releasing wheat or spraying plant growth regulators such as chlormequat before 10- 15 days to inhibit the overground growth of wheat, enhance the firmness of wheat seedlings, and improve the cold resistance and abdomen resistance.

For yellow and weak wheat fields, when the soil changes and the roots begin to grow, we can harvest fertilizer and water in time to accelerate the growth and development of wheat seedlings. It is suggested that 8 ~ 10 kg of sugar-free effective nitrogen fertilizer (such as urea) should be topdressing during the wheat turning green, so as to restore the normal growth momentum of wheat as soon as possible and accelerate the utilization of wheat in ordinary wheat fields. The management mode is "combination of promotion and control". In terms of management methods, it is suggested to first suppress and then promote, and then shallow tillage. In addition, before the arrival of late spring cold, it is necessary to cultivate Chongqing loose soil to improve the ground temperature, improve the root activity of barley seedlings and reduce the impact of low temperature in the East China Sea.