果树断根对铁的吸收是被动吸收 ,铁被吸收、运输的形态均为二价态 ,断根吸收的铁绝大部分被运往叶片。整根吸收的铁大部分淀积在根内。铁胁迫致苹果黄叶时进行根系输铁液能在较短时间内提高叶片叶绿素和铁的含量从而达到复绿的效果 ,在 Fe- citric acid、Fe- EDTA和 Fe- N3种铁肥中 ,Fe- N是适宜根系输液的铁肥品种 ,主干强力高压注射铁肥复绿较慢 ,叶面喷布效果不显著 Fruit tree roots on the absorption of iron is passive absorption, iron is absorbed, the transport patterns are bivalent state, the vast majority of absorbed roots are transported to the leaves. Most of the entire absorbed iron is deposited inside the root. Under iron stress, yellow iron infusion could increase the content of chlorophyll and iron in a relatively short period of time to achieve the re-greening effect. Among Fe-citric acid, Fe-EDTA and Fe-N iron fertilizers, Fe-N is suitable for root transfusion of iron fertilizer varieties, the main force of high-pressure injection of iron fertilizer complex green slower foliar spray effect is not significant