Winter fertilization: urea or ammonium bicarbonate?

For many growers, the use of urea for fertilizing winter crops or ammonium bicarbonate can be a big problem. So what kind of fertilizer is most suitable? The analysis is as follows:

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, 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 urea tends to affect the growth of crops because of slower fertilizer efficiency.

Ammonium bicarbonate is rarely volatilized when the temperature is lower than 20°C. Ammonium ions can be quickly adsorbed by soil colloids. The adsorption power is 8 times that of urea and it is not easy to lose with 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. 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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