The crop is topdressed in the autumn and winter cold seasons, and ammonium bicarbonate is better than urea.
Fertility is fast. Ammonium bicarbonate belongs to ammonium nitrogen fertilizer and can be directly absorbed and utilized by crops when applied to soil. Urea belongs to amido ammonium nitrogen fertilizer and needs to be converted into ammonium nitrogen by urease secreted by urea bacteria in the soil for root absorption. Here, the rate of urea conversion mainly depends on the soil temperature at that time. Under normal conditions, all the urea applied to the soil is converted to ammonium nitrogen. It takes 7-10 days for the ground temperature to be 10C, 4-5 days for the 20C, and only 2-3 days for the 30C. It can be seen that the crops are topdressed in winter or early spring, and ammonium carbonate is more effective than urea; if urea is used, it will often affect the growth of crops because of slower fertilizer efficiency.
High utilization rate. Ammonium bicarbonate seldom volatilizes when the temperature is lower than 20C. After being applied to the soil, ammonium ions can be rapidly adsorbed by the soil colloid, and its adsorption power is 8 times that of urea. Therefore, it is not easy to lose water. After the urea is applied to the soil, it is present in a molecular state before it is converted into ammonium nitrogen, which is difficult to be adsorbed by the soil colloid and is easily lost.
The effect is good. After trials, application of ammonium bicarbonate in wheat field in winter was 1 to 1.5 times higher than that in high temperature season.
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