What problems can be caused by improper use of urea?

Urea is an ammonium amide-based fertilizer commonly used nowadays, with high nitrogen content, generally reaching 45-46%. Because it is not as volatile as ammonium bicarbonate, it has an ammonia smell when it is opened. Therefore, many farmers mistakenly believe that it is not used to burn seedlings or produce fertilizer. In fact, this is not right. There are two reasons: First, after urea is applied to the soil, the plant cannot directly absorb the ammonium amide. It must be converted into ammonium nitrogen CO(NH2)2 after being absorbed into the soil. Ammonium carbonate (NH4)2CO3 The crop can absorb ammonium ions, and a large amount of ammonium carbonate hydrates in the soil (or topsoil) to become ammonium bicarbonate and volatilizes ammonia to cause fertilizer damage. Second, modern urea is often accompanied by a certain amount of biuret in the synthesis. Generally, it is 0-5-1%, and the amount of biuret such as dry seedlings such as wheat is likely to inhibit growth at 45-50 ppm. Therefore, the following principles must be observed when using urine:

(1) Urea should be the same as bicarbonate ammonia, which should be applied deep, so that it will not cause the fertilization of urea after conversion, and can improve the utilization rate of nitrogen fertilizer;

(2) The content of urea is high, almost three times that of ammonia bicarbonate. Therefore, when using the same physical quantity, it should be reduced by more than half, especially in the seedling stage, pay special attention to the amount should not be too high; (3) if it is a second There is no better way to cause urinary damage. Some articles have reported that proper application of some boron and zinc micro-fertilizer can alleviate, but we have no practice in this regard. Wang Yihu

Cabinet Light

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