0660
Glyphosate’S effect upon mineral accumulation in soybean
Ryan S. Henry; Kiersten A. Wise; William G. Johnson
Original research article
Field experiment
Soybean
Boron
Copper
Iron
Manganese
Zinc
View source document
year
2011
Country
United States
Abstract

Glyphosate has been demonstrated to reduce the macronutrient and micronutrient content of glyphosate-susceptible (GS) and first generation glyphosate-resistant (GR) or Roundup Ready (RR) soybean, possibly by complexation of the herbicide molecule with the nutrient. The recent release of newer GR soybean cultivars, second generation Roundup Ready 2 Yield (RR2Y), provides growers with newer technology for weed management programs, but it is unclear how the nutrient content of these cultivars is affected by glyphosate in a field setting. The objective of this experiment was to identify the effect of glyphosate on the concentration of macronutrient and micronutrients in RR and RR2Y soybean when grown using standard agronomic practices in Indiana. The macronutrients analyzed were nitrogen, phosphorus, potassium, sulphur, magnesium, and calcium. The micronutrients analyzed were boron, zinc, manganese, iron, copper, and aluminum. Our results indicate that while differences in accumulation of macro and micronutrients exist between the two cultivars tested, there was no consistent effect due to glyphosate treatment. Glyphosate-induced deficiency symptoms observed in previous reports were not observed in this study. Growers should continue to monitor soil nutrient levels to identify and correct nutrient deficiencies.

Keywords

soybean; glyphosate; mineral accumulation; boron; zinc; manganese; iron; copper

Outcomes reported
Soil properties
Nutrient uptake
Soil properties
Yield
Synthesis
Key insight
Across three Indiana field sites, glyphosate did not consistently change soybean leaf micronutrient accumulation, although some cultivar-specific nutrient differences occurred.
Limitations
One-year field study with two glyphosate-resistant soybean cultivars and no direct micronutrient treatment or economic analysis.
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