Our experience says that iron deficiencies are common in Montana, and not nearly as common in the western part of the state as in the eastern part of the state. Low levels of available iron result in decreased plant chlorophyll formation and impairment of respiration processes. I decided to go check with Bill Inskeep, resident soil chemist. If so, the Fe is not that low. In the event that the land owner decides to make an application of some form of iron fertilizer, the situation can be best addressed with either foliar applications or soil-applied applications.
Some possible sources are .
For soil applications, relatively modest applications of chelated forms are probably best, forms such as Reax Iron or THIS Iron. The micro nutrients were chelated. Although iron is complexed in calcareous soils, it is possible for high levels to cause toxicity. Best approach is to try a foliar spray on a limited area or a surface application in a strip first, at these low rates. Observe and follow up.