Degradation of Metribuzin in Two Soil Types of Lebanon

Khoury, R.; Coste, Camille; Kawar, Nasri S.

doi:10.1080/03601230600805790

Cited by 22 publications

(11 citation statements)

References 14 publications

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“…In both, metribuzin and napropimide cases insignificant differences (Table 3). The calculated t 1/2 values of metribuzin were within the range (107-144 days) reported in a previous degradation study with sterile soil samples (Khoury et al 2006). In addition, t 1/2 values for napropamide were in general agreement with Guo et al (2008), who reported that the degradation half-life of napropamide in sterilized soil was almost threefold of that in nonsterilized soil.…”

Section: Biodegradation Studies In Soilmentioning

confidence: 92%

Biodegradation of soil-applied pesticides by selected strains of plant growth-promoting rhizobacteria (PGPR) and their effects on bacterial growth

Myresiotis

Vryzas

Papadopoulou‐Mourkidou

2011

Biodegradation

129

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A laboratory study was conducted to investigate the influence of four PGPR strains on the degradation of five soil applied pesticides and their effects on bacterial growth. Interactions of Bacillus subtilis GB03, Bacillus subtilis FZB24, Bacillus amyloliquefaciens IN937a and Bacillus pumilus SE34 with two concentrations of acibenzolar-S-methyl, metribuzin, napropamide, propamocarb hydrochloride and thiamethoxam in liquid culture and soil microcosm were studied. The degradation of acibenzolar-S-methyl by all PGPR tested in low and high concentration, was 5.4 and 5.7 times, respectively, faster than that in non-inoculated liquid culture medium. At the end of the 72-h liquid cultured experiments, 8-18, 9-11, 15-36 and 11-22% of metribuzin, napropamide, propamocarb hydrochloride and thiamethoxam, respectively, had disappeared from PGPR inoculated medium. Under the soil microcosm experimental conditions, the half-lives of acibenzolar-S-methyl incubated in the presence of PGPR strains spiked at 1.0 and 10.0 mg kg(-1) were 10.3-16.4 and 9.2-15.9 days, respectively, markedly lower compared with >34.2 days in the control. From the rest pesticides studied degradation of propamocarb hydrochloride and thiamethoxam was enhanced in the presence of B. amyloliquefaciens IN937a and B. pumilus SE34. Acibenzolar-S-methyl, propamocarb hydrochloride and thiamethoxam significantly increased the PGPR growth. However, the stimulatory effect was related to the level of pesticide spiked.

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Section: Biodegradation Studies In Soilmentioning

confidence: 92%

Biodegradation of soil-applied pesticides by selected strains of plant growth-promoting rhizobacteria (PGPR) and their effects on bacterial growth

Myresiotis

Vryzas

Papadopoulou‐Mourkidou

2011

Biodegradation

129

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“…Khoury et al [45] indicated that soil microorganisms contribute to the rapid degradation of metribuzin and the increase in soil organic matter favored microbial development and subsequently accelerated the degradation of metribuzin. They concluded that the degradation speed of metribuzin in non-sterile soils was found to be 7-12 times higher than that in sterilized soils.…”

Section: Resultsmentioning

confidence: 99%

Impact of soil amendments on metribuzin and DCPA half-lives and mobility into agricultural runoff water

Antonįous

Turley

Hill

2014

Journal of Environmental Science and Health, Part B

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The retention and behavior of two herbicides, metribuzin [4-amino-6-tert-butyl-4, 5-dihydro-3-methylthio-1, 2, 4-triazin-5-one] and DCPA [1,2,3,5, dimethyl] ester, in runoff and seepage water from agricultural fields were investigated. The objectives of this investigation were to: (i) determine the dissipation and half-life (T 1/2 ) of metribuzin and DCPA herbicides in soil under three management practices: chicken manure (CM), sewage sludge (SS), and no-mulch native soil (NM); (ii) monitor herbicides residues in runoff and infiltration water following addition of soil amendments; and (iii) determine the impact of soil amendments on the transport of NO 3 , NH 4 , and PO 4 from soil into surface and subsurface water. Half-life (T 1/2 ) values of metribuzin were 24, 18, and 12 d in CM, SS, and NM treatments, respectively. Similarly, T 1/2 values of DCPA were greater in CM and SS incorporated soil (45.8 and 52.2 d, respectively) compared to NM native soil (26.2 d). Addition of CM and SS to native agricultural soil increased water infiltration, lowering runoff water volume and herbicide residues in runoff following natural rainfall events. We concluded that soil amendments could be used to intercept pesticide-contaminated runoff from agricultural fields. This practice might provide a potential solution to pesticide contamination of surface and seepage water from farmlands.

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“…Photodecomposition on the soil surface and in aqueous media is an important process in the degradation of metribuzin. Furthermore, the increase in soil organic matter enhances degradation (Khoury et al, 2006). A reduction in the recommended dose of metribuzin can be achieved by employing PC-clay formulations, which reduces the environmental risk associated with herbicide applications (Undabeytia et al, 2011).…”

Section: Ecotoxicologymentioning

confidence: 99%