During drought years the potential exists for the corn plant to have high levels of nitrates. This is largely due to high soil nitrogen levels that are readily available, but the plant is unable to utilize it because of moisture shortages. As a result the nitrates accumulate in the plant and can occur at toxic levels. Excessive levels in corn when harvested as green chop or made into corn silage and then fed can causehigh blood levels of methemoglobin to occur.
Iowa State University
Strohbehn, Daryl R. and Leu, Byron, "Beware! Nitrate potential in drought-stricken corn crop" (2005). Integrated Crop Management News. 1419.
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