Influence of PRE-emergence herbicides on soybean development, root nodulation and symbiotic nitrogen fixation. (June 2021)

• Record Type: Journal Article
• Authors: Ribeiro, Victor Hugo Vidal; Maia, Lucas Silva Gontijo; Arneson, Nicholas John; Oliveira, Maxwel Coura; Read, Harry Wood; Ané, Jean-Michel; dos Santos, Jose Barbosa; Werle, Rodrigo
• Is Part Of: Crop protection. Volume 144(2021)
• Publication Date: 2021-06
• Subjects: PRE-emergence herbicides -- Bradyrhizobium japonicum -- Root nodulation -- Soybean -- Nitrogen fixation; ALS acetolactate synthase -- ARA acetylene reduction assay -- DAT days after treatment -- GR glyphosate-resistant -- N nitrogen -- Ndfa nitrogen derived from the atmosphere -- OM organic matter -- POST POST-emergence -- PPO protoporphyrinogen oxidase -- PRE PRE-emergence -- PSII photosystem II -- SOA site of action -- US United States -- VLCFA very-long-chain fatty acid -- 1× label rate -- 5× five times label rate; Plants, Protection of -- Periodicals; 632.05
• DOI: 10.1016/j.cropro.2021.105576
• Languages: English
• ISSNs: 0261-2194

Abstract

Abstract: Widespread occurrence of herbicide-resistant weeds has further limited effective POST-emergence herbicide options in soybean ( Glycine max (L.) Merr.) leading to an increased adoption of PRE-emergence herbicides. The objective of this study was to investigate the influence of 11 commonly used PRE herbicides on soybean development, root nodulation, and symbiotic N fixation. Soybean plants were grown under greenhouse conditions in pots (10 L; 4 plants per pot) filled with silt loam soil and treated one day after planting with a labeled field rate of imazethapyr, chlorimuron-ethyl, cloransulam-methyl, metribuzin, sulfentrazone, flumioxazin, saflufenacil, acetochlor, S -metolachlor, dimethenamid-P, pyroxasulfone and no herbicide (nontreated control). Sulfentrazone reduced soybean canopy at the VC growth stage but no canopy reduction was observed at the V2 growth stage from any of the herbicide treatments. At the R2 growth stage, herbicides had no effect on soybean development (root and shoot biomass), root nodulation (# nodule per plant, nodule diameter, and nodule biomass) and symbiotic N fixation (acetylene reduction assay and 15 N natural abundance). According to our findings, although PRE herbicides may slightly affect early-season soybean development, the impacts on plant growth, root nodulation, and symbiotic N fixation were negligible. Thus, when sprayed according to the label, the benefits of PRE herbicides for weed control likely outweigh any potential concern regarding soybean development, root nodulation, and N fixation. Highlights: Sulfentrazone reduced soybean canopy coverage at the VC growth stage. PRE-emergence herbicides did not impact canopy coverage at the V2 growth stage. PRE-emergence herbicides did not impact soybean growth at the R2 growth stage. PRE-emergence herbicides did not affect root nodulation at the R2 growth stage. PRE-emergence herbicides did not affect nitrogen fixation at the R2 growth stage.