碳铵性质很不稳定,极易分解产生氨气挥发,不仅造成肥分损失,而且还容易伤害农作物。但在傍晚天黑前后施用碳铵,能有效地防止碳铵伤苗.这是因为在作物的叶片上长有很多气孔,这些气孔白天张开,傍晚开始关闭。如在白天气温比较高时 The nature of ammonium bicarbonate is very unstable, easily decomposed produce ammonia volatilization, not only caused loss of fat, but also easy to damage crops. However, the application of ammonium bicarbonate before and after dark in the evening can effectively prevent ammonium carbonic acid injury, which is due to the long stomata on the leaves of the crop that open during the day and close at early evening. As in the daytime when the temperature is relatively high