Fertilization case: A farmer in Inner Mongolia planted 4 mu of corn. When he turned the ground in the spring, 5 cars of manure were used as base fertilizer. In the past, he used 45% (15-15-15) of compound fertilizer 35 kg as the base fertilizer. of. He believes that the use of earthworms is now being used, and he is prepared to wait until the corn grows and fertilizes fertilizer as early as possible. In previous years, 10 kg of urea was topdressed at the mouth of the bell, and now when the corn seedlings grow to 6-7 leaves, he applied topdressing. In order to make up for the lack of fertility of the soil manure, he applied more urea and used a total of 25 kilograms of urea per acre as a top dressing for corn seedlings. He applied urea to the surface and poured a small amount of surface water. However, on the third day after watering, he found that the corn seedlings were dark green and hiccuped, like frost, and some new leaves were still curled. He was very anxious and he dug several roots of corn seedlings and saw that the seedling root system was not too abnormal. In order to find out the problem as soon as possible and take remedial measures, he rushed to consult the expert. Experts told him to irrigate first, then cultivating loose soil and cultivating soil to ease the seedlings. He did what the experts meant. About half a month later, corn seedlings began to return to normal. Expert Comment: Why does corn use urea fertilizer to fight snoring? What role does irrigation and cultivator play? It turned out that the emergence of smashing corn seedlings is to make urea decomposition of ammonia gas smoked. Because the maize seedlings are young and the young leaves are close to the ground, while the amount of urea is large, and they are applied on the surface of the soil, only a small amount of surface water is poured during the high temperature season. It is impossible to leaching the granular urea into the depths of the soil. Can dissolve large amounts of urea at the surface. The area where the farmer's friends live is calcareous soil, which is a kind of alkaline soil. The dissolved urea molecules decompose rapidly at high temperatures to produce large amounts of ammonia and carbon dioxide, resulting in smoked seedlings. In this case, the conditional plot is first watered and the soil is cultivated. Not only can dilute nitrogen fertilizer, but also ventilation can promote root growth. In the case of plots without irrigation, immediate adoption of measures for soil cultivation after deep cultivating can keep nitrogen from reducing ammonia volatilization. Case Tip: Urea is a high-concentration nitrogen fertilizer for topdressing, and the amount of application should be appropriate at one time. Calcareous soils are alkaline and use urea and ammonium nitrogen fertilizers as top dressings.
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