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ARS Home » Southeast Area » Oxford, Mississippi » Natural Products Utilization Research » Research » Publications at this Location » Publication #402834
Research Project: Biobased Pesticide Discovery and Product Optimization and Enhancement from Medicinal and Aromatic Crops

Location: Natural Products Utilization Research

Title: Lack of significant effects of glyphosate on glyphosate-resistant maize in different field locations

Author
item SIMIONATO BIDÓA, VITOR - Sao Paulo State University (UNESP)
item DOS SANTOS NETO, JOSÉ - State University Of The Central West (UNICENTRO)
item DE GOES MACIEL, CLEBER - State University Of The Central West (UNICENTRO)
item TROPALDI, LEANDO - Sao Paulo State University (UNESP)
item CARBONARI, CAIO - Sao Paulo State University (UNESP)
item DUKE, STEPHEN - University Of Mississippi
item DE CARVALHO, LEONNARDO - Sao Paulo State University (UNESP)

Submitted to: Agronomy
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 4/4/2023
Publication Date: 4/6/2023
Citation: Simionato Bidóa, V., Dos Santos Neto, J.C., De Goes Maciel, C.D., Tropaldi, L., Carbonari, C.A., Duke, S.O., De Carvalho, L.B. 2023. Lack of significant effects of glyphosate on glyphosate-resistant maize in different field locations. Agronomy. 13(10. Article 13041071. https://doi.org/10.3390/agronomy13041071.
DOI: https://doi.org/10.3390/agronomy13041071

Interpretive Summary: Glyphosate-resistant (GR) maize is dominant in countries where it is grown. Significant, adverse effects of glyphosate application to GR maize have been reported, but few data from robust studies exist to determine if such effects are common. In this study, the effects of recommended application rates (single and sequential applications) were used on GR maize grown at two locations for one season and for two seasons in a third location. No significant effects of glyphosate were found at any location or growing season on mineral content (N, P, K, Ca, Mg, S, Cu, Fe, Mn, and Zn) in leaves or grain, plant height, stem diameter, ear parameters, or yield. Likewise, harvested grain quality, as determined by percent starch, protein, and total lipids, was unaffected by glyphosate treatment at any location. Neither glyphosate nor aminomethylphosphonic acid, the primary degradation product of glyphosate, were found in grain from any treatment at any location, except for 20 ng g-1 of glyphosate found in grain from one season at one location. These results support the view that recommended applications of glyphosate have no significant effects on growth, grain composition, mineral content, grain quality, nor yield of GR maize.

Technical Abstract: Glyphosate-resistant (GR) maize is dominant in countries where it is grown. Significant, adverse effects of glyphosate application to GR maize have been reported, but few data from robust studies exist to determine if such effects are common. In this study, the effects of recommended application rates (single and sequential applications) were used on GR maize grown at two locations for one season and for two seasons in a third location. No significant effects of glyphosate were found at any location or growing season on mineral content (N, P, K, Ca, Mg, S, Cu, Fe, Mn, and Zn) in leaves or grain, plant height, stem diameter, ear parameters, or yield. Likewise, harvested grain quality, as determined by percent starch, protein, and total lipids, was unaffected by glyphosate treatment at any location. Neither glyphosate nor aminomethylphosphonic acid, the primary degradation product of glyphosate, were found in grain from any treatment at any location, except for 20 ng g-1 of glyphosate found in grain from one season at one location. These results support the view that recommended applications of glyphosate have no significant effects on growth, grain composition, mineral content, grain quality, nor yield of GR maize.