Summary
An experiment was carried out in water cultures to compare the effect of iodide and iodate on plant growth. The experimental crop was oats which is known to be very sensitive to an overdose of iodine.
Iodide led to a more pronounced growth depression than did iodate. The rate of uptake of iodine from iodide was more than double that from iodate. There appeared to be a fairly quantitative relation between the iodine content of the oat roots and their growth with high supplies of KI and KIO3. This indicates that iodide and iodate, after being absorbed by the plant, have about the same effect on growth and that differences in effect during the initial stages of growth can be largely ascribed to differences in iodine contents.
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Borst Pauwels, G.W.F.H. An investigation into the effects of iodide and iodate on plant growth. Plant Soil 16, 284–292 (1962). https://doi.org/10.1007/BF01381340
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DOI: https://doi.org/10.1007/BF01381340