At present, the application of urea and ammonium bicarbonate is relatively common, of which urea is more favored by the majority of farmers. People often use urea as a basal fertilizer and topdressing fertilizer when they are cold in winter or early spring. The tests showed that the effect of applying urea at low temperatures in winter and spring was far less than that of ammonium bicarbonate.
First, the fertilizer effect of urea is slower than that of ammonium carbonate. After it is applied to soil, it cannot be directly used by crops. It must be converted from amide nitrogen to ammonium nitrogen fertilizer. The conversion rate is proportional to the temperature, and the temperature is 10°C. In the next, urea conversion takes 10 days, and even if ammonium bicarbonate is below 5°C, it can be decomposed and absorbed by crops. Therefore, the application of ammonium bicarbonate at low temperatures can still be quickly absorbed and utilized by crops.
2. The loss of urea is much less than that of ammonium bicarbonate. When the temperature is lower than 20°C, it is rarely volatilized. After it is applied to soil, it can dissociate into positively charged ammonium ions and is adsorbed by soil colloids. However, after urea is applied to a low-temperature soil, it is difficult to be converted and dissolved in soil solution molecularly. It cannot be adsorbed by soil colloids and is easily leached by irrigation water, causing a large amount of nitrogen to be lost.
For these reasons, it is advisable for farmers to use ammonium bicarbonate when applying base fertilizers or topdressing for fruit trees and other crops in winter and spring.
First, the fertilizer effect of urea is slower than that of ammonium carbonate. After it is applied to soil, it cannot be directly used by crops. It must be converted from amide nitrogen to ammonium nitrogen fertilizer. The conversion rate is proportional to the temperature, and the temperature is 10°C. In the next, urea conversion takes 10 days, and even if ammonium bicarbonate is below 5°C, it can be decomposed and absorbed by crops. Therefore, the application of ammonium bicarbonate at low temperatures can still be quickly absorbed and utilized by crops.
2. The loss of urea is much less than that of ammonium bicarbonate. When the temperature is lower than 20°C, it is rarely volatilized. After it is applied to soil, it can dissociate into positively charged ammonium ions and is adsorbed by soil colloids. However, after urea is applied to a low-temperature soil, it is difficult to be converted and dissolved in soil solution molecularly. It cannot be adsorbed by soil colloids and is easily leached by irrigation water, causing a large amount of nitrogen to be lost.
For these reasons, it is advisable for farmers to use ammonium bicarbonate when applying base fertilizers or topdressing for fruit trees and other crops in winter and spring.
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