At present, farmers' friends generally have a "preference" for urea, so that urea is often used as a base fertilizer or top dressing even when it is cold in winter or early spring. In fact, the practice of using urea without any time is unscientific. Although ammonium bicarbonate easily volatilizes and loses under high temperature conditions, it is superior to urea in the application of ammonium bicarbonate in winter and spring temperatures.
First, the effect of ammonium bicarbonate is faster than that of urea. Because urea can not be directly absorbed by crops after it is applied to soil, it must be converted from ammonium amide to ammonium nitrogen. The conversion rate is proportional to the temperature, and the conversion is very slow at low temperature. According to experiments, at 10°C, urea conversion takes 10 days, while ammonium bicarbonate can decompose even below 5°C. Therefore, the application of ammonium bicarbonate under low temperature conditions can still be quickly absorbed by the crop.
Second, the loss of urea is greater than that of ammonium bicarbonate. Ammonium carbonate is rarely volatilized when the temperature is lower than 20°C. Immediately after being applied to the soil, ammonium ions and carbonate ions are decomposed and firmly adsorbed by the soil colloid, and then slowly released for the absorption and utilization of the crop. Its adsorption force is about 8 times that of urea, and its volatilization loss at low temperature is only one-third that of urea. Less nutrient loss. On the other hand, when urea is applied to soil at a low temperature, it is difficult to be converted and it is dissolved in the soil in a molecular state and cannot be adsorbed by soil colloids, and is easily leached by irrigation water or rainwater to cause the loss of nitrogen nutrients. Some people have experimented, in the winter wheat field topdressing ammonium bicarbonate, its effect can be increased by 1 to 1.5 times higher than the high temperature season.
Therefore, it is advocated that ammonium bicarbonate should be applied to crops in winter and spring seasons, and urea should be used in high temperature seasons.
In addition, ammonium bicarbonate is applied under low temperature conditions. Whether it is basal fertilizer or topdressing, it is better to apply 10 cm deep, and the fertilizer has high utilization rate, and the effect of increasing production is significant.
First, the effect of ammonium bicarbonate is faster than that of urea. Because urea can not be directly absorbed by crops after it is applied to soil, it must be converted from ammonium amide to ammonium nitrogen. The conversion rate is proportional to the temperature, and the conversion is very slow at low temperature. According to experiments, at 10°C, urea conversion takes 10 days, while ammonium bicarbonate can decompose even below 5°C. Therefore, the application of ammonium bicarbonate under low temperature conditions can still be quickly absorbed by the crop.
Second, the loss of urea is greater than that of ammonium bicarbonate. Ammonium carbonate is rarely volatilized when the temperature is lower than 20°C. Immediately after being applied to the soil, ammonium ions and carbonate ions are decomposed and firmly adsorbed by the soil colloid, and then slowly released for the absorption and utilization of the crop. Its adsorption force is about 8 times that of urea, and its volatilization loss at low temperature is only one-third that of urea. Less nutrient loss. On the other hand, when urea is applied to soil at a low temperature, it is difficult to be converted and it is dissolved in the soil in a molecular state and cannot be adsorbed by soil colloids, and is easily leached by irrigation water or rainwater to cause the loss of nitrogen nutrients. Some people have experimented, in the winter wheat field topdressing ammonium bicarbonate, its effect can be increased by 1 to 1.5 times higher than the high temperature season.
Therefore, it is advocated that ammonium bicarbonate should be applied to crops in winter and spring seasons, and urea should be used in high temperature seasons.
In addition, ammonium bicarbonate is applied under low temperature conditions. Whether it is basal fertilizer or topdressing, it is better to apply 10 cm deep, and the fertilizer has high utilization rate, and the effect of increasing production is significant.
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