Role of Soil pH in the Development of EnhancedBiodegradation ofFenamiphos

Singh, Brajesh K.; Walker, A.; Morgan, J. Alun W.; Wright, Denis J.

doi:10.1128/aem.69.12.7035-7043.2003

Cited by 92 publications

(60 citation statements)

References 30 publications

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“…This included species of Arthrobacter, Nocardia and Pseudomonas, and smaller numbers of Achromobacter and Bacillus. Singh et al (2003) observed that pesticide-degrading genes are normally associated with plasmids that can move between bacterial strains, thus enhancing the diversity of the degraders. It is also well known that the degradation of several chemicals is carried out by two or more microorganisms (Nelson et al, 1982;Read, 1986), or by communal interaction between different components of consortia Sutherland et al, 2000).…”

Section: Bacteriamentioning

confidence: 99%

“…Several studies have shown that an increase in soil pH results in an increase in soil microbial biomass and enzymatic activity (Acosta-Martinez & Tabatabai, 2000;Singh et al, 2003). Edwards (1973), in his review of the biological aspects of pesticide degradation, emphasised the greater activity of bacteria and actinomycetes that occurs in near-neutral acid soil, while Singh et al (2003) observed that the second and third treatment with fenamiphos resulted in much more rapid degradation than the first treatment in two alkaline soils. These observation suggest that an alkaline pH in soils supports higher microbial biomass and enzymatic expression, which in turn helps the microbial community to adapt and to develop gene-enzyme systems for the enhanced degradation of pesticides.…”

Section: Soil Phmentioning

confidence: 99%

“…A given pesticide's likelihood of reaching the groundwater is affected by the degradation rates in the subsurface, as well as in the surface layers, of the unsaturated soil zone (Bromilow et al, 1986;Pothuluri et al, 1990;Bergstrom, 1996). AGRICULTURAL PRACTICES LEADING TO THE DEVELOPMENT OF AMD Pesticide degradation in soil is affected by both biotic and abiotic factors, which complement one another in the microenvironment (Singh et al, 2003). Repeated exposure of a soil microbial population to the same active ingredient often stimulates reproduction of the organisms that are able to degrade the chemical concerned, due to it being an energy or mineral nutrient source that is inaccessible to the other microorganisms that are present in the same soil (Dunn & Noling, 2003).…”

Section: Soil Depthmentioning

confidence: 99%

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Accelerated Microbial Degradation of Nematicides in Vineyard and Orchard Soils

Hugo

Mouton²,

Malan

2016

SAJEV

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Accelerated microbial degradation (AMD) of organophosphate and carbamate nematicides is a phenomenon whereby biodegradation in the soil is increased, leading to a dramatically shortened persistence of nematicides. More intensified agriculture practices in South Africa in response to the future demand for food may lead to increased pest and disease pressure, which in turn will lead to more frequent pesticide application. The same principle applies to plant-parasitic nematode control practices, and the overuse and misuse will have a pronounced effect on the enhancement of AMD. With limited management options available, the responsible use of nematicides becomes more pertinent. Producers should be aware of the problems associated with multiple soil applications of organophosphates and carbamates against plant-parasitic nematodes. This article reviews factors contributing to the AMD of carbamate and organophosphate nematicides in soil and makes practical recommendations to avoid the occurrence of AMD in vineyard and orchards.

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Section: Bacteriamentioning

confidence: 99%

Section: Soil Phmentioning

confidence: 99%

Section: Soil Depthmentioning

confidence: 99%

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Accelerated Microbial Degradation of Nematicides in Vineyard and Orchard Soils

Hugo

Mouton²,

Malan

2016

SAJEV

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“…Many researchers have also reported degradation of organic pollutants at alkaline conditions. However, it is slow and also reflected through our results [24,27,28].…”

Section: Discussionmentioning

confidence: 50%

Potential of Enterobacter sp. Strain ATA1 on imidacloprid degradation in soil microcosm: Effects of various parameters

Sharma

Rajor

Toor

2015

Env Prog and Sustain Energy

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Previously isolated strain ATA1 of Enterobacter sp. was used in this work to study various factors affecting degradation of IMI in soil microcosm. Minimal salt medium containing 1% (w/v) glucose was found to be suitable as carbon source for inoculums preparation. Effect of various parameters including soil pH, inoculum size, initial concentration of IMI and flooding of soil for the degradation of imidacloprid in soil were investigated. Strain ATA1 has effectively degraded imidacloprid of range 25−50 mg kg−1 when soil was spiked with different initial concentration of IMI (25−100 mg kg−1) as verified by HPLC analysis. Degradation rate was slower in soil with lower pH compare to neutral pH of soil. An inoculums size of 2 × 107 CFU g−1 of soil was found to be suitable at pH 7 for degrading IMI of 50 mg kg−1. Flooding of IMI spiked soil has also shown significant degradation as compare to nonflooded soil. Metabolites produced after IMI degradation under optimized parameters were identified by GC‐MS analysis. This model study could be used for removal of toxic compounds in field experiments. © 2015 American Institute of Chemical Engineers Environ Prog, 34: 1291–1297, 2015

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“…In general, atrazine and metolachlor are considered to be persistent in soils and their half-life ranged from 15 to more than 60 days depending on the soil physicochemical properties (Byer et al, 2011). The low half-life values reported in the literature (Barriuso and Houot, 1996;Vanderheyden et al, 1997;Singh et al, 2003;Yassir et al, 1999) were related to (1) high soil pH which support higher bacterial biomass, (2) soil exposed to repeated applications of herbicides, and (3) specifi c management practices . The half-life of atrazine and metolachlor computed in this study are in agreement with the literature (Gaynor et al, 1998) and a previous fi eld monitoring study (Jaikaew et al, 2015).…”

Section: Dissipation Of Atrazine and Metolachlormentioning

confidence: 99%

Aspect of the degradation and adsorption kinetics of atrazine and metolachlor in andisol soil

Jaikaew

Malhat

Boulangé

et al. 2017

Hellenic Plant Protection Journal

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SummaryThe degradation kinetics and sorption characteristics of atrazine and metolachlor in Japanese andisol soil were evaluated using laboratory incubation of soil samples. The water content of the soil was set to field capacity while three different temperatures (5, 25 and 35°C) were considered for the experiment. First order model fitted the degradation kinetics of both herbicides under the investigated temperature range with half-lives ranging from 19.2 to 46.9 days for atrazine and from 23.4 to 66.9 days for metolachlor, respectively. The activation energies (Ea) of atrazine and metolachlor calculated using Arhenius equation were 21.47 and 23.91 kJ mol−1, respectively. The soil sorption study was conducted using the batch equilibrium process. The adsorption behaviors of atrazine and metolachlor were investigated using linear, Freundlich and Langmuir isotherms although the linear and Freundlich isotherms gave relatively high correlation coefficient (R2) and very low standard error of estimate (SEE). The free energy (ΔG°) values were in the range −30.6 to −32.0 kJ/mol, and −32.1 to −41.5 kJ/mol for atrazine and metolachlor, respectively. Thermodynamic parameters indicated that the adsorption is spontaneous, endothermic accompanied by increase in entropy. The understanding of atrazine and metolachlor sorption processes is essential to determine the pesticide fate and availability in soil for pest control, biodegradation, runoff and leaching.

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Role of Soil pH in the Development of EnhancedBiodegradation ofFenamiphos

Cited by 92 publications

References 30 publications

Accelerated Microbial Degradation of Nematicides in Vineyard and Orchard Soils

Accelerated Microbial Degradation of Nematicides in Vineyard and Orchard Soils

Potential of Enterobacter sp. Strain ATA1 on imidacloprid degradation in soil microcosm: Effects of various parameters

Aspect of the degradation and adsorption kinetics of atrazine and metolachlor in andisol soil

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