Simulated glyphosate drift influences nitrate assimilation and nitrogen fixation in non-glyphosate-resistant soybean

Journal of Agricultural and Food Chemistry
Nacer BellalouiAlemu Mengistu

Abstract

Nontarget injury from glyphosate drift is a concern among growers using non-glyphosate-resistant (non-GR) cultivars. The effects of glyphosate drift on nitrate assimilation and nitrogen fixation potential, nodule mass, and yield of non-GR soybean were assessed in a field trial at Stoneville, MS. A non-GR soybean cultivar 'Delta Pine 4748S' was treated with glyphosate at 12.5% of use rate of 0.84 kg of active ingredient/ha at 3 (V2), 6 (V7), and 8 (R2, full bloom) weeks after planting (WAP) soybean to simulate glyphosate drift. Untreated soybean was used as a control. Soybeans were sampled weekly for 2 weeks after each glyphosate treatment to assess nitrate assimilation and N2 fixation potential. Nitrate assimilation was assessed using in vivo nitrate reductase assay in leaves, stems, roots, and nodules. Nitrogen fixation potential was assessed by measuring nitrogenase activity using the acetylene reduction assay (ARA). Nitrogen content of leaves, shoots, and seed and soybean yield were also determined. In the first sampling date (4 WAP), glyphosate drift caused a significant decrease in NRA in leaves (60%), stems (77%), and nodules (50%), with no decrease in roots. At later growth stages, NRA in leaves was more sensitive to gly...Continue Reading

References

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Citations

Jan 9, 2008·The New Phytologist·Levent OzturkIsmail Cakmak
Jan 27, 2009·Pest Management Science·Renan GravenaAdriana R Gravena
Jul 28, 2010·Pest Management Science·Krishna N ReddyL Jason Krutz
Jan 3, 2018·Environmental Science and Pollution Research International·Martha MertensWolfram Reichenbecher
Feb 26, 2010·Journal of Agricultural and Food Chemistry·Krishna N ReddyRobert M Zablotowicz
Mar 28, 2008·Journal of Agricultural and Food Chemistry·Nacer BellalouiCraig A Abel
Jul 4, 2021·The Science of the Total Environment·Fernanda Pacheco de Almeida Prado Bortolheiro, Marcelo de Almeida Silva

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