Influence of the herbicide bentazon on soil microbial community

Allievi, L.; Gigliotti, C.; Salardi, C.; Valsecchi, Giovanni; Brusa, Tullio; Ferrari, Annamaria

doi:10.1016/s0944-5013(96)80064-4

Cited by 14 publications

(8 citation statements)

References 19 publications

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“…). This agrees with Allievi et al ., who noted that, after bentazon application, only the number of anaerobic N 2 ‐fixing bacteria decreased significantly. The observed trend (Fig.…”

Section: Resultssupporting

confidence: 92%

Behaviour of bentazon as influenced by water and tillage management in rice‐growing conditions

López‐Piñeiro

Peña

Albarrán

et al. 2017

Pest Management Science

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Bentazon is a widely used herbicide in rice agroecosystems that has commonly been found in water resources. To assess how tillage and water regimes affect sorption/desorption, dissipation and leaching of bentazon in Mediterranean rice-growing conditions, field experiments were carried out using tillage and flooding (TF), tillage and sprinkler irrigation (TS), no-tillage and sprinkler irrigation (NTS) and long-term no-tillage and sprinkler irrigation (NTS7). After 3 years, the K values in TS were 2.3, 1.6 and 1.7 times lower than the values in NTS7, NTS and TF respectively. Greater sorption of bentazon was related to higher contents in total organic carbon and, although to a lesser extent, in humic acids and dissolved organic carbon. The persistence of bentazon was significantly greater under anaerobic (half-life DT = 94.1-135 days) than under aerobic (DT = 42.4-91.3 days) incubation conditions for all management regimes. Leaching losses of bentazon were reduced from 78 and 74% in TS and TF to 61 and 62% in NTS7 and NTS respectively. The mid- and long-term implementation of sprinkler irrigation in combination with no-tillage could be considered a management system that is effective at reducing water contamination by bentazon in Mediterranean rice-growing agroecosystems. © 2017 Society of Chemical Industry.

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“…). This agrees with Allievi et al ., who noted that, after bentazon application, only the number of anaerobic N 2 ‐fixing bacteria decreased significantly. The observed trend (Fig.…”

Section: Resultssupporting

confidence: 92%

Behaviour of bentazon as influenced by water and tillage management in rice‐growing conditions

López‐Piñeiro

Peña

Albarrán

et al. 2017

Pest Management Science

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“…Therefore the reduced methane oxidation rate at high bentazone concentrations was unlikely only the result of excessive consumption of reducing equivalents. No toxic effects have been reported for bentazone in soil microbial community toxicity tests or in Microtox tests at 2 mg /L, the maximum concentration applied in our study (Allievi et al, 1996;Ruiz et al, 1997). Also the bentazone degradation products 6-OH-bentazone and 8-OH-bentazone are less acute toxic than the parent compound (Kanungo et al, 2012).…”

Section: Effect Of Bentazone On the Methane Oxidation (Cib)mentioning

confidence: 59%

Evidence of co-metabolic bentazone transformation by methanotrophic enrichment from a groundwater-fed rapid sand filter

et al. 2018

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The herbicide bentazone is recalcitrant in aquifers and is therefore frequently detected in wells used for drinking water production. However, bentazone degradation has been observed in filter sand from a rapid sand filter at a waterworks with methane-rich groundwater. Here, the association between methane oxidation and removal of bentazone was investigated with a methanotrophic enrichment culture derived from methane-fed column reactors inoculated with that filter sand. Several independent lines of evidence obtained from microcosm experiments with the methanotrophic enrichment culture, tap water and bentazone at concentrations below 2 mg/L showed methanotrophic co-metabolic bentazone transformation: The culture removed 53% of the bentazone in 21 days in presence of 5 mg/L of methane, while only 31% was removed in absence of methane. Addition of acetylene inhibited methane oxidation and stopped bentazone removal. The presence of bentazone partly inhibited methane oxidation since the methane consumption rate was significantly lower at high (1 mg/L) than at low (1 μg/L) bentazone concentrations. The transformation yield of methane relative to bentazone normalized by their concentration ratio ranged from 58 to 158, well within the range for methanotrophic co-metabolic degradation of trace contaminants calculated from the literature, with normalized substrate preferences varying from 3 to 400. High-resolution mass spectrometry revealed formation of the transformation products (TPs) 6-OH, 8-OH, isopropyl-OH and di-OH-bentazone, with higher abundances of all TPs in the presence of methane. Overall, we found a suite of evidence all showing that bentazone was co-metabolically transformed to hydroxy-bentazone by a methanotrophic culture enriched from a rapid sand filter at a waterworks.

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“…The degree of persistence observed was only slightly influenced by the applied dose, in contrast with other herbicides (Allievi et al, 1996), probably due to the small amounts used in the two soils for the study. The behavior of the herbicide did vary markedly with soil type.…”

Section: Resultsmentioning

confidence: 76%

Microbial ecotoxicity and persistence in soil of the herbicide bensulfuron-methyl

Gigliotti

Allievi

Salardi

et al. 1998

J. of Env. Sc. & Hlth., Part B

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Changes in microbial numbers and activities in two non-flooded soils treated with bensulfiiron-methyl at 16 and 160 µg/kg were studied after 1 and 4 weeks of incubation under laboratory conditions. In addition to herbicide persistence, six general and functional microbial groups (numbers of culturable aerobic and anaerobic bacteria, aerobic N 2 fixers, autotrophic nitrifiers, aerobic and anaerobic cellulolytic microorganisms) and two activities (respiration and nitrification) were also studied. With respect to microbial numbers, only cellulolytic microorganisms in soil which had never been previously treated with pesticides significantly decreased in number. Only the higher dose of bensulfiiron-methyl in the second soil 381

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Influence of the herbicide bentazon on soil microbial community

Cited by 14 publications

References 19 publications

Behaviour of bentazon as influenced by water and tillage management in rice‐growing conditions

Behaviour of bentazon as influenced by water and tillage management in rice‐growing conditions

Evidence of co-metabolic bentazone transformation by methanotrophic enrichment from a groundwater-fed rapid sand filter

Microbial ecotoxicity and persistence in soil of the herbicide bensulfuron-methyl

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