Source: Iowa State University

Whether Roundup Ready soybean varieties require different manganese management practices than conventional varieties and if this is really a problem under Iowa conditions is examined in a new report from Iowa State University.

Shortly after the introduction of Roundup Ready (RR) soybean questions arose whether these varieties and/or glyphosate applications to them alter manganese (Mn) relations compared to conventional soybean varieties. It is well documented that certain cations, including Mn, can reduce the performance of glyphosate when the cations are present in water used as a carrier.

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