Low temperature in autumn and winter, the best application of ammonium bicarbonate
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The crop is topdressed in the autumn and winter cold seasons, and ammonium bicarbonate is better than urea. 1. Fertility is fast. Ammonium bicarbonate belongs to ammonium nitrogen fertilizer and can be directly absorbed and utilized by crops when applied to soil. Urea belongs to amido ammonium nitrogen fertilizer and needs to be converted into ammonium nitrogen by 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 applied to the soil is converted to ammonium nitrogen. It requires 7-10 days at a ground temperature of 10°C, 4-5 days at 20°C, and only 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. 2. The utilization rate is high. Ammonium bicarbonate seldom volatilizes when the temperature is lower than 20°C. After being applied to the soil, ammonium ions can be rapidly adsorbed by the soil colloid, and its adsorption force is 8 times that of urea. Therefore, it is not easy to lose water. After the urea is applied to the soil, it is present in a molecular state before it is converted into ammonium nitrogen, which is difficult to be adsorbed by the soil colloid and is easily lost. 3. The effect is good. After tests, applying Ammonium Bicarbonate in winter wheat field is 1 to 1.5 times more effective than in high temperature season.