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Glyphosate-Manganese Interactions in Roundup Ready Soybean

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. The complexes formed between glyphosate and metal cations are not absorbed as efficiently as free glyphosate alone, resulting in reduced weed control. The primary role of AMS used with glyphosate applications is to minimize formation of the cationglyphosate complexes. This article will review research that has investigated the interactions between RR soybean and Mn relations, rather than what happens in the spray tank. Although the focus of this article is Mn, glyphosate would interact similarly with other cations (e.g. calcium, iron, magnesium).