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 base fertilizer and topdressing fertilizer in the winter or early spring when they are cold. Experiments have shown that the effect of applying urea in spring and low temperatures is far less than that of ammonium bicarbonate. First, urea has a slower fertilizer effect than ammonium bicarbonate. After urea is applied to the soil, it cannot be directly absorbed and utilized by the crops. It must be converted from amide nitrogen to ammonium nitrogen fertilizer. The conversion rate is directly proportional to the temperature. Under the condition of 10C temperature, urea conversion takes 10 days, and carbon Even if ammonium is below 5C, it can be decomposed and absorbed by crops. Therefore, after applying ammonium bicarbonate at low temperatures, it can still be quickly absorbed and utilized by crops. Second, the loss of urea is greater than that of ammonium bicarbonate. Ammonium carbonate rarely volatilizes when the temperature is lower than 20C. After it is applied to the soil, it can dissociate into positively charged ammonium ions and is adsorbed by soil colloids. After the urea is applied to the soil at low temperature, it is difficult to convert. Molecular solution dissolved in soil solution, can not be adsorbed by the soil colloid, easily leached by irrigation, causing a large number of nitrogen loss. In view of the above reasons, farmers should use ammonium bicarbonate in the winter or spring for base fertilizers or top dressings for fruit trees and other crops. In addition, the winter is also good for applying carbon ammonium.
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