What is the nature of ammonium bicarbonate? Why is the effect of deep application good?

Ammonium bicarbonate (NH4HCO3), abbreviated as ammonium bicarbonate, is one of the more commonly used fertilizer varieties. The ammonium bicarbonate contains about 17% nitrogen, which is white fine particles, crystal, has a strong ammonia odor, is easily soluble in water, and has a rapid fertilizer effect, and its aqueous solution is alkaline. The dried ammonium bicarbonate is basically stable below 20 ° C. When the temperature rises and the air humidity is high, it is easy to absorb moisture and decompose, resulting in the loss of nitrogen by the volatilization. Therefore, transportation and storage must be tightly packed and dried at low temperatures.

After it is applied to the soil, it dissolves quickly in water to produce ammonium ions, and the bicarbonate is absorbed by the crop. Although its aqueous solution is alkaline, it may increase the alkalinity of the soil in the initial stage of application to the soil, but After nitrification, the alkalinity of the soil will decrease, so ammonium bicarbonate has little effect on the pH of the soil. It is suitable for a variety of crops and various soil applications, but is preferably applied on acidic soils.

Ammonium bicarbonate should be used as base fertilizer and top dressing. It is not advisable to use seed fertilizer or manure fertilizer to avoid alkaline or damage to the seed or seedling. Because ammonium bicarbonate is not stable, ammonia is volatile. Therefore, whether it is used as base fertilizer or top dressing, it should be applied in dry land or paddy field. It should be covered immediately after deep application and application. According to many experiments and production practices, deep application is more than shallow application. Generally, it should be 6-8 cm deep. According to the North Test, the use of mechanical 6 cm is similar to urea.