Experts: Some wheat fields covered with frozen water appeared cracks. The main reason was that the water was not used in time after the freezing water was used. The water immediately after infiltrated into the soil surface was hardened, and large winds blown and scraped a large number of longitudinal cracks along the ridge direction. The depth of these cracks is deep and shallow on different plots. Depending on the texture of the soil and the amount of water, the texture is more viscous and deeper, and the water is larger in depth. The consequences of this cracking phenomenon in the wheat field will evaporate the water that has just been poured into the earth and the valuable “green water†originally stored in the underlying soil pool, which greatly facilitates the running process. It is like tearing open countless gaps in the wheat field, allowing valuable “green water†to continue to lose to the atmosphere. The result of this evaporation will inevitably worsen the drought situation, and sometimes it will be worse than not watering. Q: Under what circumstances can we not water it? Experts: First, for the northern region where wheat has not yet returned green, the surface soil of the wheat field has not yet been thawed. The second is to treat wheat fields that have returned to Qing and carefully inspect the wheat fields whose dry soil layer is less than 3 cm and have been frozen. For the slightly dry topsoil and small ash, the method of repression can be used. Question: What measures should be taken to prevent cracks on the surface of wheat fields in the face of severe drought conditions that must be watered? Experts: Wheat fields with severe drought conditions are supported by the government and strive for watering conditions. As for the amount of water depends on the situation and irrigation methods. The weak seedlings in the period of returning to the Qing Dynasty should not be flooded. Excessive water volume will cause rapid cooling and no ventilation in the soil, which is not conducive to the growth of wheat roots and the cultivation of strong seedlings. As for whether fertilization depends on the seedling situation and the fertilization basis before the previous year, wheat fields that have not been fertilized before winter should be returned to green manure as early as possible with watering, and do not use only urea. In the case of high yields and weak seedlings, phosphate fertilizers should be considered. Nitrogen fertilizers, such as ammonium bicarbonate and ammonium sulfate, are all earlier than urea. The amount of urea need not be too much once (10 to 15 pounds/mu). Whether it is urea or ammonium carbonate, do not topsoil, fertilize after watering. Q: Why do you want to scratch after watering? Does not plan to see if there is crack in the field again? Expert: Yes. After watering, the water infiltrate into the soil. When the topsoil is 2 to 3 cm in diameter, the soil must be removed. Available nails, working depth of 3 to 5 cm. The role is to loosen the topsoil, smash the soil, remove the compaction, strengthen the ventilation, level the ground, compost, remove the weeds so that the root soil structure becomes the upper virtual state, is conducive to the preservation of the root system of wheat and wheat and promote strong seedlings. In short, the concept and method of drought resistance is not just the use of irrigation to solve the drought. Soil cultivation is an important water storage and protection measure that our country's agriculture has often used since ancient times. Modern water-saving agriculture needs to deepen understanding and use flexibly.
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Question: Recently, explorations in Shandong and Henan provinces and other places have found that there are two completely different situations in wheat fields where frozen water has been poured. One type of drought is lighter, while another type of wheat field has been poured with frozen water, but the drought is still very serious. As soon as you enter the wheat field, you can see that there are many large cracks in the direction of Shun Ridge, called the crack phenomenon. Why does the crack appear on the surface of wheat fields? What should I do?