Cobalt and Iodine

Authored by: Ronald G. McLaren

Encyclopedia of Environmental Management

Print publication date:  December  2012
Online publication date:  December  2012

Print ISBN: 9781439829271
eBook ISBN: 9781351235860
Adobe ISBN:

10.1081/E-EEM-120042647

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Abstract

Cobalt (Co) and iodine (I) are two trace elements that are generally considered to be nonessential for the growth of higher plants.[1] However, both elements are essential nutrients for animals, particularly in the case of ruminants (sheep and cattle), and deficiencies of Co and I in grazing animals are not uncommon. Cobalt is also essential for nitrogen (N) fixation by micro-organisms such as rhizobium and blue-green algae, and can actually be toxic to plants if present at high concentrations in the soil. Most investigations of Co and I in the soil have concentrated on factors affecting the plant availability of these elements, with the aim of diagnosing potential deficiencies.

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