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Manganese Deficiency in Roundup Ready soybeans

Manganese Deficiency in Roundup Ready soybeans. Benefits of Manganese. Manganese (Mn) is especially important to legumes, such as soybeans. Mn is essential in the activation of enzymes that stimulate the formation of flavonoids – which are proteins that stimulate the genes for nodulation.

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Manganese Deficiency in Roundup Ready soybeans

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  1. Manganese Deficiency in Roundup Ready soybeans

  2. Benefits of Manganese • Manganese (Mn) is especially important to legumes, such as soybeans. • Mn is essential in the activation of enzymes that stimulate the formation of flavonoids – which are proteins that stimulate the genes for nodulation. • Legumes also need Mn to help metabolize nitrogen that is fixed by the bacteria in nodules into forms that can be effectively utilized within the foliage and seed coats. -- Barney Gordon, Kansas State University December 13, 2005

  3. Manganese Deficiency • Manganese (Mn) deficiency is most common on low pH sandy or high pH poorly drained soils. • Mn availability is greatly decreased with increased soil pH. • Soil test analysis for Mn is not a very reliable method of predicting Mn deficiency in soybeans at this time • Mn deficiency symptoms can show up early in the season (pale yellow leaves, interveinal chlorosis, and/or leaf cupping) -- Barney Gordon, Kansas State University December 13, 2005

  4. Mn Deficiency in RR Soybeans • Roundup Ready soybean varieties more susceptible to manganese (Mn) deficiency than conventional soybeans in any soil • The problem lies with the gene that was inserted into soybeans to give them resistance to glyphosate. • Roundup Ready soybean varieties roots are less able to solubilize Mn in the soil than conventional varieties. • The application of glyphosate to Roundup Ready beans also may directly retard Mn metabolism in the plant. -- Barney Gordon, Kansas State University December 13, 2005

  5. Correcting Mn Deficiency in Soils • No matter whether soils test high or low for Mn producers are very likely to get a yield response to applied Mn on soybeans • RR soybeans will respond to applied Mn on soils with a pH less than 6.0 even though soils with a pH of 6.5 or higher are more likely to have Mn deficiency • Apply 15 to 25 lb/acre of 32% Mn Sulfate granules as part of broadcast application • Apply 6% Mn EDTA chelate liquid at rates of 2 to 3 qt/acre broadcast or banded -- Barney Gordon, Kansas State University December 13, 2005

  6. Foliar Mn to Correct Deficiency • Some liquid Mn fertilizers antagonize glyphosate efficacy in tank mixtures • Use fertilizer formulations with strong chelating agents like EDTA to eliminate antagonism. • AMS or water conditioners (Speedway) should always be included in tank mixes of glyphosate and Mn along with full labeled rates of glyphosate. • Include 6% Mn EDTA chelate liquid into tank mixtures at rate of 2 to 3 qt/acre at V4 to R4 stage • Include Sovereign into tank mixtures at rate of 1 gal/acre at V4 to R4 -- Don Penner – Michigan State University - June, 2005

  7. Foliar Mn to Correct Deficiency • Include 6% Mn EDTA chelate liquid into tank mixtures at rate of 2 to 3 qt/acre at V4 to R4 stage

  8. Foliar Mn to Correct Deficiency • Include Sovereign into tank mixtures at rate of 1 gal/acre at V4 to R4

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