Pouring frozen water at the right time is an important measure to ensure the safe wintering of wheat. The specific benefits are as follows: First, the soil can be collapsed. Especially in recent years, most of the wheat fields are stalked to the field, which causes the soil to be unrealized. Pouring the frozen water can greatly improve the soil of the field. It is also conducive to freezing and thawing weathering, to make up for cracks and eliminate wintering pests; secondly, to ensure proper water supply during wintering of wheat, to consolidate the tillering before winter, to promote new tillers, and to have the effect of spring water in spring and prevent spring drought. The third is to improve the thermal conductivity of the soil, which can effectively reduce the temperature variation in the field, prevent the freezing of dead seedlings caused by the sharp rise and fall of temperature; the fourth is to play a role in the action of reducing alkalinity on the saline-alkali soil and reducing the salinization of the soil. In addition, winter irrigation also promotes microbial activities, accelerates the decomposition of organic fertilizers, and satisfies the effects of wheat growth after greening.
Therefore, it is especially important to properly pour the frozen water of wheat. How to pour wheat frozen water first time is appropriate, in addition to the weather, the field sensation, but also depends on the seedlings.
One is to look at the weather. In the autumn rain is rare, the winter cold and dry years have the best effect. Winter irrigation is suitable when the daily average temperature is stable at around 3 °C. It is too early, the temperature is high, and the evaporation is strong. It can not play the role of water storage and protection, and it will cause the wheat seedlings to grow long and even the winter before the winter. Severe; too late, the temperature is low, unfavorable water infiltration, the ground is easy to accumulate water to form an ice shell. The farmer said: It is not too cold, the winter irrigation is too early; the night is frozen, the irrigation is just right; the freezing is not enough, the winter irrigation is late, this is scientifically justified.
The second is to look at the field sensation. Insufficient soil moisture, 5-20 cm soil moisture content less than 13%, loam less than 15%, clay less than 17%, or soil relative humidity below 60%, that is, winter freezing is required, higher than the above indicators Slow irrigation or no irrigation; the bottom layer of rice buckwheat is wet and dry, the ground temperature is low, it is not suitable for flood irrigation, so as to avoid red, yellow and even dead seedlings, you can take the method of spraying, simmering or splashing. Increase the temperature and protect the seedlings.
The third is to look at the Miao situation. Wheat early spring seedlings generally have better bottoms, can be slowed or not, flooding, late buckwheat sowing, short growth period before winter, insufficient accumulated temperature, single seedlings, in order to make full use of the effective accumulated temperature of the early winter cold and warm gap, In order to promote the tiller piers, in addition to the overly arid fields, it is generally better to not pour, but it can be poured back into Qingshui as early as possible.
The quality of winter irrigation is different and the effect is the same. It is necessary to prevent the rushing, pressing, drowning and silting caused by flooding of large water, and to damage the wheat seedlings; and to cut the loose soil at the right time after the winter irrigation to prevent the knot from cracking and blowing the wind and killing the dead seedlings.
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