一、适宜的气温。当气温为18-20℃时,果树叶片的气孔全部张开,这时进行叶面喷肥,有利于营养元素的吸收和运输,提高肥液和利用率。二、适宜的温度,空气湿度大时,肥液湿润叶片的时间长,被叶片吸收的养分多;如果湿度小,肥液喷后很快变干,不仅果树难以吸收,还会因水分蒸发,肥液浓度增 First, the appropriate temperature. When the air temperature is 18-20 ℃, all the stomata of fruit tree leaves are opened, then foliar spray is beneficial to the absorption and transportation of nutrient elements and to improve the fertilizer liquid and utilization rate. Second, the appropriate temperature, air humidity, the fertilizer leaves moist for a long time, the leaves absorb nutrients and more; if the humidity is small, liquid fertilizer soon after drying, not only hard to absorb fruit trees, but also because of water evaporation, Increased fluid concentration