Wheat should be remedied as soon as possible

Wheat cold injury in early spring, also known as late spring, refers to the wheat in the "spring" season to enter the period of returning green joints, due to the arrival of cold and cooling, the surface temperature dropped below 0 °C, the occurrence of frost hazards. Because at this time the temperature has gradually warmed, and suddenly came the cold wave, it is also known as late spring.

Causes of Wheat Early Freeze Injury: In April, the wheat has completed the development of the vernalization and illumination stages. The development of the vernalization stage in the wheat has reduced the development of the cold resistance. After the light stage, jointing begins, and the ability to resist low temperatures below 0°C is completely lost. When the cold wave arrives and the weather is clear and windless at night, the surface temperature of the land drops sharply below 0°C, and freezing injury will occur in early spring.

In the wheat fields that suffered from frost damage in early spring, the leaves were soaked with boiling water, and they gradually dried up after exposure to sunlight. The young spikelets on the top of the stem have their meristematic cells more sensitive to hypothermia than leaf cells. The extent of frost on the young spikes varies according to the developmental process. Generally speaking, the young and female primordium has entered the period of differentiation of the primordium of the androecium (joining joints) and is susceptible to freezing. The ear is atrophied and finally dried up; The young ear of the period) is still transparent crystal after being frozen and has not been frozen to death. This is the reason why the main stem is often frozen in the wheat field, the tillering is not frozen, or one ear is partially frozen, and the late sowing wheat field is lighter than the early sowing wheat freezing.

Remedial measures: 1, select suitable varieties according to local conditions, appropriate sowing, the use of semi-precision precision sowing technology, change all nitrogen fertilizer base fertilizer "a shelling" combined with top dressing fertilizer and other measures, is from the basis of planting to prevent early spring frost damage Measures. 2, moderate growth inhibition of growth over wheat. The method is repression in early spring. The repressed wheat field can inhibit the growth and development of wheat, and avoid premature jointing to reduce cold resistance. 3, in the early spring after the occurrence of frost damage should be timely watering. Wheat is a crop with tillering characteristics. Wheat fields that suffer from frost damage in early spring will not freeze all of them, and wheat axillary buds may grow into grains with long components. Wheat that suffered from frost damage in early spring should be immediately applied with available nitrogen fertilizer and watering. The coupling effect of nitrogen and moisture will promote the early tillering of wheat and small borers, increase the tillering percentage of tillers, and reduce the loss of freezing damage.

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