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| Hi Eddie,
the article that you linked describes research in Egypt where 2 major factors contributing to cobalt deficiency are common : sandy soil and high pH. In addition, the article specifies a soil pH of 8.0 and a sandy loam texture (70% sand).
Soils formed from most Midwest geologic materials w/ a pH of 6-7 are much less likely to have cobalt deficiency.
A map showing cobalt content of the A horizon of US soils should be attached. The blue colors are where cobalt deficiency is most likely.
here is the source of the map:
https://pubs.usgs.gov/sir/2017/5118/sir20175118_element.php?el=27
You might also want to take a look at this article:
Cobalt: An Essential Micronutrient for Plant Growth?
https://pmc.ncbi.nlm.nih.gov/articles/PMC8635114/
Joel
WIU Agriculture
 (CobaltAhorizonmap (full).jpg)
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 CobaltAhorizonmap (full).jpg (139KB - 21 downloads)
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The box I’m stuck stuck in. The plant nutrition box.
