First of all, the answer is published. Fertilization is applied during the winter and early spring and other cold seasons. Ammonium bicarbonate is more effective than urea.
One of the reasons is that the fertilizer is effective. Ammonium bicarbonate belongs to ammonium nitrogen fertilizer and can be directly absorbed and utilized by crops when applied to soil. Urea belongs to ammonium ammonium phosphate and needs to be converted into ammonium nitrogen under the action of urease secreted by urea bacteria in the soil for root absorption.
Among them, the speed 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, which 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 application of ammonium bicarbonate is faster than applying urea when crops are topdressed in winter or early spring; if urea is used, it will often affect the growth of crops because of slower fertilizer efficiency.
The second reason is the high utilization rate. Ammonium bicarbonate seldom evaporates when the temperature is lower than 20°C. After being applied to the soil, ammonium ions can be rapidly adsorbed by the soil colloid. The adsorption force is 8 times that of urea, and it is not easy to lose with water. However, after urea is applied to the soil, it exists in a molecular state before it is converted into ammonium nitrogen, and it is difficult to be adsorbed by soil colloids and is easily lost. After tests, applying Ammonium Bicarbonate in the winter wheat field is 1 to 1.5 times more effective than in the hot season.
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