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Abstract
New ideas are being developed on iron relationships in plants. Older textbooks on plant nutrition are obsolete in respect to iron and some newer textbooks are somewhat obsolete. It is very important that students be kept near the front of this changing field to insure that progress continues. The chapter by Mengel and Kirkby (1982) is excellent although it does not go into siderophores and their possible relationships with iron uptake and to microbial and crop ecology, or deeply into redox in relationship with uptake of iron from synthetic chelating agents, or into iron uptake by plants from organic iron amendments, or into the riboflavin aspect of the iron response mechanism, or into hormonal control of iron transport, or into the role of iron chelates on the flowering of Lemna, or into the role of iron on thylakoid synthesis or much into the diagnosis of iron status of plants and soils as examples, or much into the significance of iron interactions in ecological problems related to lime soils. The chapter does a good work of putting together the iron stress response mechanism and its characteristics although it could expand more into its genetic control.