果树根外追肥应注意事项一、要掌握好肥液浓度。当气温低、湿度大、叶片老时，肥料对叶片损伤中弱，使用浓度可大一些。反之则应小一些。二、要掌握好施肥的时间。一般要求肥液停留在叶面３０分钟以上，愈长愈好。因此，最好在无风的阴天，或晴天上午１０时前，下午４时后... Fruit tree root top dressing should pay attention to matters First, to master the concentration of fat fluid. When the temperature is low, humidity, leaves old, fertilizer damage to the leaves in the weak, the use of concentrations can be larger. On the contrary should be smaller. Second, we must master the fertilization time. The general requirements of liquid fertilizer stay in the foliage for more than 30 minutes, the longer the better. Therefore, the best in the windless cloudy, or sunny before 10 o’clock, after 4 pm ...