Glyphosate resistant soybean [Glycine max (Merr.) L.] comprises 96% of the total acreage planted in Minnesota in 2015. Research has suggested that glyphosate resistant soybean varieties are less efficient in manganese (Mn) uptake than conventional varieties. Although DTPA soil test for Mn is an accepted method to determine if Mn fertilization is needed for crop production, in Minnesota, however, use of this soil test method to fertilize soybean is not conclusive. Recent studies in Minnesota have shown significant relationship between DTPA-Mn test and relative grain yield. Soybean grain yield increased by Mn application on soils with 15 ppm or less DTPA-Mn. Because Mn-deficiency can significantly...
Updated May 18, 2020:
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