Wheat is timely winter irrigation, one can calm the ground temperature to prevent freezing damage to the dead seedlings; the second is to thicken the soil, crush the scum, eliminate the wintering pests; the third is the combination of winter water and winter fertilizer, which can create good conditions for the greening and root growth of Hunchun wheat. In addition, the winter irrigation of saline-alkali wheat fields can also be changed to soil by pressing alkali. According to the survey, winter irrigation is more than 123,000 spikes in the wheat field, and the number of spikes is increased by 6.7, the grain weight is increased by 1.3 grams, and the yield is increased by 27%. Whether wheat needs winter irrigation and when it is winter irrigation, it is important to grasp the "three look":
One must look at the sensation. Winter irrigation should be carried out in wheat fields with a water holding capacity of less than 80% before winter and with irrigated conditions.
Second, we must look at the seedlings. The tiller is more than 1.5~2 wheat fields, and the winter irrigation is more suitable. Generally, the weak seedlings, especially the single seedlings that are late in the evening, are best not to be winter irrigation, otherwise it is prone to freezing damage; the wheat fields that grow too much can be delayed or not. In order to control and promote.
Third, we must look at the temperature. The suitable time for wheat winter irrigation generally starts from the daily average temperature drop to 7-8 °C, and ends at about 5 °C; the experience of the masses is: "Night freezing is eliminated, winter irrigation is just right." Winter irrigation is too early, the temperature is high, The evaporation is large, and the effect should not be obtained; the winter irrigation is too late, the soil freezes, the water can not be infiltrated in time, the ground area water freezes, the wheat seedlings are easy to suffocate under the ice layer, or form ice, lift the clods, pull Broken wheat roots, hanged wheat seedlings. The order of winter irrigation is generally to first infiltrate the clay soil with poor water permeability, low-lying land, and then to infiltrate the sandy land with strong water permeability; firstly, the second and third types of wheat fields with insufficient bottom or poor surface, the post-irrigation is better, and the sowing is better. Early, and there are prosperous wheat fields.
In addition, it should be noted that the amount of winter wheat irrigation should not be too large, so that it can be poured and the same day is infiltrated; generally 50 to 60 cubic meters per mu. In order to save water, it is necessary to make a canal to prevent flooding; after winter irrigation, it is necessary to draw the loose soil in time to bridge the cracks, so as to ensure the temperature increase and prevent the roots from being damaged by the wind.
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