福建省永安市的魏和深朋友来信问,果树叶面喷肥应当注意哪些问题? 中国农业大学欧阳昌民硕士解答说,果树叶面喷肥应当注意以下几个问题。 1.要看果树的长势如果果树长势弱、枝叶伸长缓慢、叶片趋黄色或淡黄色,这表明果树缺氧缺铁,应当以喷施氮肥为主,并且适当喷一些柠檬酸铁和磷肥、钾肥;如果叶大嫩绿、枝条间节过长,氮肥充足,应当以喷施磷肥和钾肥为主,适当喷一些微量元素。 2.要注意喷施时间在花前期、花期、壮果期的阴天或晴天下 Wei Yong, Yong’an City, Fujian Province, and friends from the letter asked, fruit foliar fertilizer should pay attention to what issues? China Agricultural University Master Ouyang Changmin answer, fruit foliar fertilizer should pay attention to the following questions. 1. Look at the growing fruit trees If the fruit trees growing weak, slow foliage elongation, leaves tend to yellow or light yellow, indicating that the fruit tree oxygen deficiency and iron deficiency, spraying nitrogen should be based, and appropriate spraying some iron citrate and phosphate fertilizer, Potassium; if the leaves are tender green, branches too long, sufficient nitrogen, should be sprayed with phosphate and potassium-based, appropriate spray some trace elements. 2 should pay attention to spraying time in the pre-flowering, flowering, fruitful period of cloudy or sunny days