Rich Zollinger from NDSU forwarded this paper on Glyphosate-Manganese Interactions in Roundup Ready Soybean (PDF). The quick summary is that most studies indicate that you should treat fields with manganese deficiencies similarly whether you’re planting conventional or Roundup Ready Soybeans.
We did run into some manganese deficiencies in wheat last summer, so we will be keeping an eye out this summer as well.
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