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Crops can be directly absorbed and utilized by crops in low temperature seasons such as autumn and winter and early spring. Urea needs to be converted into ammonium nitrogen by urease to be absorbed by roots. The rate of urea conversion depends mainly on the soil temperature at that time. Generally, it takes 7 to 10 days at a ground temperature of 10 ° C, 4 to 5 days at 20 ° C, and only 2 to 3 days at 30 ° C. It can be seen that the crops are topdressed in winter or early spring, and the application of ammonium hydrogencarbonate is faster than urea.
The high utilization rate of ammonium bicarbonate is rarely volatilized when the temperature is lower than 20 ° C. After being applied to the soil, the ammonium ion can be quickly adsorbed by the soil colloid, and its adsorption force is 8 times that of urea, which is not easy to be lost with water. Urea exists in a molecular state before it is converted, and it is difficult to be adsorbed by the soil colloid and is easily lost.
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