Proceedings 2008 |
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CD-AY-332 |
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Utility of Future Herbicide Tolerance Traits for Corn and Soybeans How much are our current soybean yields limited by micronutrients like manganese? Many soybean growers have noticed a yellowing (sometimes referred to as “yellow flash”) of glyphosate-tolerant soybean following post-emergent glyphosate applications. Glyphosate molecules are known to chelate with Mn, and prior research has suggested that leaf Mn deficiencies are more prevalent following glyphosate applications. Foliar Mn applications have been recommended when leaf Mn levels are low, and these are perhaps most effective when applied about 7-10 days after each glyphosate application. In this presentation, we will review what is known about foliar Mn applications versus banding of Mn at planting, and about the soil factors that limit Mn availability to soybean plants at various intensities of glyphosate application (from no glyphosate at all to 3 applications per year). The Indiana Soybean Alliance has been instrumental in funding this project in 2007 and 2008. Mark Loux Professor, Department of Horticulture and Crop Science |