作物在冬季及早春等低温季节追肥,施用碳酸氢铵要比施用尿素效果好。一是肥效快碳酸氢铵属于铵态氮肥,施入土壤后能被作物直接吸收利用;而尿素属于酰铵态氮肥,需要在土壤中尿素细菌分泌的脲酶的作用下转化成铵态氮才能供根系吸收。而尿素转化的速度主要取决于当时的土壤温度。 Crops in the winter and early spring and other low temperature season dressing, the application of ammonium bicarbonate better than urea. First, the rapid effect of ammonium bicarbonate fertilizers are ammonium nitrogen fertilizer, applied to the soil after the crop can be directly absorbed and use; and urea is an ammonium nitrogen fertilizer, urea urease in the soil needs to be secreted by the urease into the role of ammonium nitrogen Root absorption. The rate of urea conversion depends mainly on the soil temperature at that time.