In the winter and spring cold seasons when applying nitrogen fertilizer to crops, ammonium bicarbonate is the best choice. Since ammonium bicarbonate is applied to farmland, it can be directly absorbed and utilized by crops without conversion, and nitrogen can be supplied in time to increase yield. However, the effect of urea application in the cold season is not as good as that of ammonium bicarbonate because urea is transformed into the soil before it can be absorbed and used by crops. At low temperatures, the conversion rate is slow and it is easily lost.
Tests have shown that when the temperature is 5°C, 10°C and 20°C, the conversion of urea takes 15 days, 7 to 10 days and 4 to 5 days, respectively. Due to the low temperature in winter and spring, soil colloids have a strong adsorption capacity for ammonium bicarbonate, which is 9 to 12.5 times that of urea. Ammonium hydroxide has a low volatilization loss at low temperatures, and the leaching rate is also small, about 1/3 of that of urea.
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