1. Soil moisture Considering soil moisture, if it is less than 70% of the field capacity (less than 16% of the combined soil and less than 18% of the silt), winter irrigation is required; if it is higher than 70%, winter irrigation may be delayed. Or not winter irrigation, but it is necessary to strengthen the loose soil, measures to protect the earth, raise the temperature, and promote the roots of wheat under the bar to cultivate strong seedlings.
Second, the temperature suitable for winter irrigation requires a daily average temperature of about 3°C. If the winter irrigation is too early, the temperature is still high and the evaporation is large, which will not achieve the effect of water irrigation and mashing. At the same time, it will cause the wheat seedlings to grow in length and not resist freezing. The winter irrigation will be late, the temperature will be low, the soil will freeze, and the water will not infiltrate. The occurrence of Lingtai will cause the wheat seedlings to freeze or suffocate. After the winter irrigation, the cold current came and when the temperature dropped below 0°C, the winter irrigation was higher than the ground temperature without winter irrigation, which was greatly beneficial to ensure the safety of winter wheat seedlings.
Third, the seedlings when the seedlings are irrigated during the winter season are also important conditions to consider whether to carry out winter irrigation. Wang Miao generally does not lack water and fertilizer, do not have winter irrigation. Weak seedlings (especially late-seeding wheat and single-rooted seedlings) are also not suitable for winter irrigation to prevent silt seedlings, Lingtai, freeze-infested wheat seedlings, and even dead seedlings. For such weak seedlings, the winter water can be turned back to Qingshui, and the water can be used to adjust the fertilizer, and the fertilizer can be used to attack the seedlings, so that the wheat seedlings can turn from weak to strong.
IV. Precautions 1. The amount of winter irrigation should not be too large, so as to avoid the water in the ground area and the formation of ice shells when the temperature is low, causing the plants to be frozen in the ground, the roots to suffocate, and the death due to childbirth. 2. After winter irrigation, loose soil must be cut in time to avoid the occurrence of crack damage due to soil compaction. Late sowing must pay special attention. In addition to protecting soil to prevent cracking and aeration of the soil, it can also increase the ground temperature by about 0° to 10cm at about 1°C, which is conducive to promoting seedling growth. Wheat winter irrigation can greatly increase soil moisture, increase the survival rate of wheat seedlings, and finally achieve the effect of increasing production and income.
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