The best temperature for applying carbonic amine in autumn and winter
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The crop is topdressed in the autumn and winter cold seasons, and ammonium bicarbonate is better than urea. One is that the fertilizer is effective. Ammonium bicarbonate belongs to ammonium nitrogen fertilizer and can be directly absorbed and utilized by crops after applied to soil. Urea belongs to ammonium ammonium fertilizer and needs to be converted into ammonium nitrogen under the action of urease secreted by urea bacteria in the soil for root absorption. Here, the rate of urea conversion mainly depends on the soil temperature at that time; under normal circumstances, all the urea in the applied soil is converted to ammonium nitrogen, which takes 7 to 10 days when the ground temperature is 1O°C, and 4 to 20°C. For 5 days, it only takes 2-3 days at 30°C. It can be seen that the application of ammonium bicarbonate is faster than applying urea when crops are topdressed in winter or early spring; if urea is used, it will often affect the growth of crops because of slower fertilizer efficiency. The second is high utilization. Ammonium bicarbonate rarely evaporates when the temperature is lower than 20°C. After applying the soil, ammonium ions can be quickly adsorbed by the soil colloid, and its adsorption power is 8 times that of urea. Therefore, it is not easy to lose water. However, after urea is applied to the soil, it exists in a molecular state before it is converted into ammonium nitrogen, and it is difficult to be adsorbed by soil colloids and is easily lost. Third, the effect is good. Some people have experimented with applying ammonium bicarbonate in winter wheat fields, which is 1 to 1.5 times more effective than in hot season.