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Iron Deficiency Chlorosis Research in NW Minnesota

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By John Wiersma
Agronomist
Northwest Research and Outreach Center

High pH, highly calcareous soils, common in western Minnesota, restrict the availability of soil Fe needed for optimum soybean growth and yield. On such soils, the amount of Fe fertilizer applied must surpass a threshold before there is sufficient available Fe in the soil solution to induce a positive growth response. Only a limited number of management tactics designed to improve the availability of Fe have been studied with soybean. These include variety selection, seeding density, seed-applied or in-furrow materials, and foliar treatments.

The following link is to an article titled "Soybean variety responses to increasing rates of Fe-EDDHA" by John Wiersma outlining research findings conducted over many years in the Red River Valley.  Click on the link to the PDF file to read more.

Fe Chelates_Wiersma.pdf

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