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铁胁迫致苹果黄叶时，对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ＦｅＣｉｔｒｉｃ ａｃｉｄ、ＦｅＥＤＴＡ 和ＦｅＮ 三种铁肥中，ＦｅＮ 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。
When iron stress caused the yellow leaves of apple, the content of chlorophyll and iron in leaves of the roots could be increased in a relatively short period of time to achieve the re-greening effect. Among Fe-Citric acid, Fe-EDTA and Fe-N, FeN was suitable for root-infusing iron fertilizers.