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Iodine bioavailability in acidic soils of Northern Ireland

Bowley, H.E.; Young, S.D.; Ander, E.L.; Crout, N.M.J.; Watts, M.J.; Bailey, E.H.

Authors

H.E. Bowley

S.D. Young

N.M.J. Crout

M.J. Watts

LIZ BAILEY LIZ.BAILEY@NOTTINGHAM.AC.UK
Associate Professor



Abstract

Iodine is an essential trace element for humans and grazing animals and is often deficient. Our aim was to investigate the role of soil properties in retaining and ‘fixing' iodine in soils and thereby controlling its phyto-availability to grass. Soils were spiked with labelled 129IO3− and rye grass (Lolium perenne L.) was grown to measure iodine uptake by grass as a function of yield, soil properties and continuous 127I inputs from irrigation water. Iodine-129 added at the start of the uptake trial was rapidly fixed (t1/2 c. 40 h) into non-labile humus-bound forms in soil. The 129I/127I isotopic ratio in grass, compared to the ratio in soil, declined over time confirming progressive 129I fixation into the soil solid phase. The rate of fixation was controlled by soil properties. A model describing iodine dynamics and uptake accounted for c. 75% of the variation in iodine concentration in grass. For most of the soils studied, the main source of iodine in herbage probably arises from the transient availability of periodic rainfall inputs rather than from soil sources. This is expected to improve biofortification strategies.

Journal Article Type Article
Publication Date Aug 15, 2019
Journal Geoderma
Print ISSN 0016-7061
Electronic ISSN 1872-6259
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 348
Pages 97-106
APA6 Citation Bowley, H., Young, S., Ander, E., Crout, N., Watts, M., & Bailey, E. (2019). Iodine bioavailability in acidic soils of Northern Ireland. Geoderma, 348, 97-106. https://doi.org/10.1016/j.geoderma.2019.04.020
DOI https://doi.org/10.1016/j.geoderma.2019.04.020
Keywords Iodine; Rainfall input; Irrigation input ; Soil; Plant uptake; Speciation
Publisher URL https://www.sciencedirect.com/science/article/pii/S001670611930121
Additional Information This article is maintained by: Elsevier; Article Title: Iodine bioavailability in acidic soils of Northern Ireland; Journal Title: Geoderma; CrossRef DOI link to publisher maintained version: https://doi.org/10.1016/j.geoderma.2019.04.020; Content Type: article; Copyright: © 2019 Elsevier B.V. All rights reserved.

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