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| Buckwheat,
Your Zn levels are very low and likely problematic. (Don't worry about the ratio to iron in the soil, however.)
There are lots of materials available to help you diagnose and overcome Zn deficiencies in wheat and various other crops. For instance, check out www.notill.org (don't worry if you aren't a no-tiller) and find the March 07 issue of Leading Edge or the 07 AIM Symposium materials (both of which have a price tag associated with them). I also conduct seminars to teach producers and agronomists about secondary and micronutrient deficiencies; see http://www.agronomypro.com/seminars.html
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Iron and Zinc in wheat ground
