Influence of Organic Matter in Sorption of the Saflufenacil in Ferralsols

Júnior, Lucas Heringer Barcellos; Pereira, Gustavo Antônio Mendes; Matos, Christiano da Conceição de; Souza, Paulo Sérgio de; Agazzi, Luciane Renata; Silva, Elisa Maria Gomes da; Silva, Antônio Alberto da

doi:10.1007/s00128-020-02800-5

Cited by 8 publications

(3 citation statements)

References 26 publications

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“…In this study, the increase in the organic matter content, both in XF and in F, reduced the intoxication of beet plants by saflufenacil and decreased the leaching of this product (Figure 1). These results can be explained once the addition of organic matter increases the sorption of saflufenacil in soils (Barcellos Júnior et al 2021). It was observed that the recommendation of saflufenacil dose used in pre-emergence must be considered for soil organic matter content to reach a satisfactory weed control.…”

Section: Discussionmentioning

confidence: 99%

Leaching of saflufenacil in soils with different organic matter contents

Júnior

Matos²,

Pereira³

et al. 2022

Biosci. J.

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Saflufenacil is a herbicide recommended for use in the main agricultural crops in Brazil to control eudicotyledonous weeds. However, the application of saflufenacil has been carried out without previous knowledge of this herbicide interactions with soil colloids, which may increase environmental contamination risks. In this study, the leaching of saflufenacil in soil samples was estimated with different organic matter contents. Therefore, PVC columns were filled with samples of Xanthic Ferralsol (XF) and Ferralsol (F), with different physical and chemical attributes. Twelve hours after herbicide (70 g i.a. ha-1) application, the PVC columns were subjected to a rainfall of 60 mm. For the evaluation of saflufenacil leaching, the columns were sectioned in ten parts with 5-cm each. Saflufenacil leached up to 50 and 40 cm deep in the samples, with the lowest contents of organic matter of XF and F, respectively. The increase in organic matter content of Ferralsol and Xanthic Ferralsol samples reduced saflufenacil leaching and the symptoms of intoxication in the indicator species. There was an inverse relation between the content of organic matter and the leaching of the herbicide in both soils studied. It was observed that the application of saflufenacil in soils with low organic matter contents may represent a significant environmental contamination risk of soils and watercourses.

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Section: Discussionmentioning

confidence: 99%

Leaching of saflufenacil in soils with different organic matter contents

Júnior

Matos²,

Pereira³

et al. 2022

Biosci. J.

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“…Heat herbicide is a commercial brand in Brazil that contains the active molecule saflufenacil. It is used as an alternative to control glyphosate-resistant weeds [3]. An increase in the use of this herbicide is anticipated due to the increasing regulatory pressures on glyphosate in the coming years [4].…”

Section: Introductionmentioning

confidence: 99%

Bacterial adaptation to rhizosphere soil is independent of the selective pressure exerted by the herbicide saflufenacil, through the modulation of catalase and glutathione S-transferase

Silva,

Flávia da Silva Rovida,

Gabriele Martins

et al. 2023

PLoS ONE

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Herbicides cause oxidative stress in nontarget microorganisms, which may exhibit adaptive responses to substances they have not previously encountered. Nevertheless, it is unclear whether these characteristics occur in bacteria isolated from agricultural soil. Two possible adaptation strategies of Stenotrophomonas sp. CMA26 was evaluated in agricultural soil in Brazil, which is considered stressful due to the intense use of pesticides. The study focused on degradation and antioxidant enzymes in response to the herbicide Heat, which was absent at the isolation site. The results indicated that higher concentrations of herbicide led to more intense stress conditions during the initial periods of growth. This was evidenced by elevated levels of malondialdehyde and peroxide, as well as a significant reduction in growth. Our data show that herbicide degradation is a selection-dependent process, as none of the 35 isolates from the same environment in our collection were able to degrade the herbicide. The stress was controlled by changes in the enzymatic modulation of catalase activity in response to peroxide and glutathione S-transferase activity in response to malondialdehyde, especially at higher herbicide concentrations. This modulation pattern is related to the bacterial growth phases and herbicide concentration, with a specific recovery response observed during the mid phase for higher herbicide concentrations. The metabolic systems that contributed to tolerance did not depend on the specific prior selection of saflufenacil. Instead, they were related to general stress responses, regardless of the stress-generating substance. This system may have evolved in response to reactive oxygen species, regardless of the substance that caused oxidative stress, by modulating of the activities of various antioxidant enzymes. Bacterial communities possessing these plastic tolerance mechanisms can survive without necessarily degrading herbicides. However, their presence can lead to changes in biodiversity, compromise the functionality of agricultural soils, and contribute to environmental contamination through drift.

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“…Studies with herbicides derived from weak acids, such as indaziflam, have shown that these compounds are more adsorbed to the soil in the presence of higher levels of organic matter (BARCELLOS JÚNIOR et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

SORPTION OF INDAZIFLAM IN BRAZILIAN SOILS WITH DIFFERENT pH VALUES

et al. 2021

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Pre-emergence herbicides, such as indaziflam, have agronomic efficiency when available in the soil solution, mainly in the superficial layer (0-10 cm), the region with the highest concentration of weed seed bank. However, information about the sorption of indaziflam in Brazilian soils still is scarce, since most studies available in the literature were conducted in soils of temperate regions. The objective of this study was to estimate the sorption of indaziflam using high-performance liquid chromatography (HPLC) and bioassay in a Latossolo Vermelho-Amarelo (Oxisol) and in a Cambissolo (Inceptisol), at pH values of 5.1 and 6.1. In the biossay, Sorghum bicolor was used as an indicator plant. Quantitative indaziflam data were obtained by HPLC, and the sorption and desorption coefficients were determined in the soils using Freundlich isotherms. Increasing the pH of the two soils from 5.1 to 6.1 resulted in reductions of C50 and sorption coefficient values. Desorption, a parameter estimated only by HPLC, showed an inverse behavior to that of sorption, that is, the lowest desorption was observed in the condition of highest sorption. It is concluded that the increase in pH of the studied soils reduces indaziflam sorption, influencing the recommendations of this herbicide, from both the agronomic and the environmental points of view. When the goal is to verify the presence or absence of indaziflam in the studied soils, the bioassay technique has satisfactory efficiency. Chromatographic assay is necessary when quantifying the concentration of this herbicide in the soil.

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Influence of Organic Matter in Sorption of the Saflufenacil in Ferralsols

Cited by 8 publications

References 26 publications

Leaching of saflufenacil in soils with different organic matter contents

Leaching of saflufenacil in soils with different organic matter contents

Bacterial adaptation to rhizosphere soil is independent of the selective pressure exerted by the herbicide saflufenacil, through the modulation of catalase and glutathione S-transferase

SORPTION OF INDAZIFLAM IN BRAZILIAN SOILS WITH DIFFERENT pH VALUES

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