Avoid dry freezing: After winter irrigation, soil water content will increase, heat capacity and thermal conductivity will increase accordingly, day and night temperature will decrease, and near-surface temperature will be moderated, which will reduce wheat dry freezing damage.
Water storage and storage: After winter irrigation, water will exist in the soil in a crystalline state, will not be lost due to factors such as gravity, and the mineral nutrients dissolved in the soil solution will not be leached and lost, and can be well preserved in the soil. Among them, it functions as a water storage tank.
Prevention of spring drought: The northern wheat region of China has a long winter and less snowfall. In spring, there is also a general drought in the spring. After winter irrigation, it can not only meet the winter physiological activities of wheat, but also provide sufficient water for the smooth and early return of wheat in spring.
Improve soil structure: After three seasons of soil cultivation, especially unreasonable soil cultivation, the soil compaction and tillage layer will be hard and the block structure will increase. After winter irrigation, the soil will be affected by the interaction of freezing and thawing. The structure of the granulation, the soil rhizosphere environment of wheat is improved. Premature wintering of wheat can lead to excessive growth of wheat seedlings and no freezing resistance; watering too late, soil freezing, is unfavorable for wheat root development and safe wintering.
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