Discussion of 'Iron Chlorosis Paradox' in Fruit Trees

'Iron chlorosis paradox' may trouble the diagnosis of Fe deficiency in fruit tree leaves.On the basis of the concept of 'iron chlorosis paradox',the research progress of 'iron chlorosis paradox' was reviewed.The relationship between 'ron chlorosis paradox' and pathogenesis hypothesis of Fe deficiency chlorosis disease,different growth conditions,different measurement indicators,different measurement methods of Fe and morphology was described.Furthermore,the existed problems of this phenomenon were analyzed.The direction to further study was proposed.