Winter freezing injury refers to the freezing injury caused by the cooling of cold during the winter and after wintering of wheat, when the temperature drops by more than 10°C, and the minimum temperature is below 5°C.
Control measures: Topdressing nitrogen fertilizers in time to promote the rapid growth of small tillers. It was found that the main stem and the wheat field in which the Oita had died of freezing had to be top-dressed twice. After the first thawing in the field, the topdressing nitrogen fertilizer is applied, and 10 kg of urea per mu is used to increase fertilizer efficiency. Phosphorus can promote the effects of tillering and root development. P-deficient land can be mixed with urea and diammonium phosphate. The second time in the jointing stage of wheat, combined with water-saving pouring fertilizer, 10 kg of urea per acre.
Early spring (cold spring) refers to the fact that the wheat has entered the returning green joint section in the “spring setting†season. Due to the arrival of the cold wave, the surface temperature drops below 0° C. and the frost hazard occurs. At this time, the climate has gradually warmed up and suddenly came to a cold wave. It is also known as the cold spell.
Remedial measures: First, moderate growth inhibition of growth in wheat fields, the main measure is to suppress the early spring, spraying Zhuang Fengan. The second is to prevent early spring frost damage. The third is topdressing nitrogen fertilizer and watering after frost damage in early spring.
Low-temperature chilling wheat grows into the booting stage and suffers from low-temperature chilling hazards due to low temperatures occurring around zero degrees.
Preventive measures: Irrigation before the onset of cold temperatures can prevent and reduce the occurrence of cold damage. Remedial measures after being chilled and chilled should be watered in time, and top-dressing should be carried out as appropriate to ensure normal wheat grouting and increase grain weight.
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