The Experts below are selected from a list of 209028 Experts worldwide ranked by ideXlab platform
V. Gouy - One of the best experts on this subject based on the ideXlab platform.
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A trench study to assess transfer of Pesticides in subsurface lateral flow for a soil with contrasting texture on a sloping vineyard in Beaujolais
Environmental Science and Pollution Research, 2016Co-Authors: X. Peyrard, L. Liger, C. Guillemain, V. GouyAbstract:Subsurface lateral flow in both texture-contrast soils and catchments with shallow bedrock is suspected to be a non-point source of contamination of watercourses by Pesticides used in agriculture. As a case study, the north of the Beaujolais region (eastern France) provides a favorable environment for such contamination due to its agro-pedo-climatic conditions. Environments seen in the Beaujolais region include intense viticulture, permeable and shallow soils, steep hillslopes, and storms that occur during the periods of Pesticide application. Watercourse contamination by Pesticides has been widely observed in this region, and offsite Pesticide transport by subsurface lateral flow is suspected to be involved in diffuse and chronic presence of Pesticides in surface water. In order to confirm and quantify the potential role of such processes in Pesticide transfer, an automated trench system has been designed. The trench was set up on a steep farmed hillslope in a texture-contrast soil. It was equipped with a tipping bucket flow meter and an automatic sampler to monitor Pesticide concentrations in lateral flow at fine resolution, by means of a flow-dependent sampling strategy. Four Pesticides currently used in vine growing were studied to provide a range of mobility properties: one insecticide (chlorpyrifos-methyl) and three fungicides (spiroxamine, tebuconazole, and dimethomorph). With this system, it was possible to study Pesticide concentration dynamics in the subsurface lateral flow, generated by substantial rainfall events following Pesticide applications. The experimental design ascertained to be a suitable method in which to monitor subsurface lateral flow and related transfer of Pesticides.
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assessing Pesticide concentrations and fluxes in the stream of a small vineyard catchment effect of sampling frequency
Environmental Pollution, 2010Co-Authors: M. Rabiet, C. Margoum, V. Gouy, Nadia Carluer, M. CoqueryAbstract:This study reports on the occurrence and behaviour of six Pesticides and one metabolite in a small stream draining a vineyard catchment. Base flow and flood events were monitored in order to assess the variability of Pesticide concentrations according to the season and to evaluate the role of sampling frequency on the evaluation of fluxes estimates. Results showed that dissolved Pesticide concentrations displayed a strong temporal and spatial variability. A large mobilisation of Pesticides was observed during floods, with total dissolved Pesticide fluxes per event ranging from 5.7 × 10−3 g/Ha to 0.34 g/Ha. These results highlight the major role of floods in the transport of Pesticides in this small stream which contributed to more than 89% of the total load of diuron during August 2007. The evaluation of Pesticide loads using different sampling strategies and method calculation, showed that grab sampling largely underestimated Pesticide concentrations and fluxes transiting through the stream.
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Pesticide transfer dynamics and fluxes in the stream of a small vineyard watershed. Assessing the effect of sampling strategy on fluxes estimation
2008Co-Authors: M. Rabiet, C. Margoum, V. Gouy, N. Caluer, M. CoqueryAbstract:This study reports on the occurrence and behaviour of eight Pesticides and metabolites in a small stream draining a vineyard watershed in the Beaujolais area (France). Punctual and automatic sampling strategies were achieved along the river during one hydrological year in order to assess the spatial and temporal variability of Pesticide concentrations and loads in the river. Flood events were also monitored in order to evaluate the role of hydrological conditions on Pesticide mobilisation. Results show the strong temporal and spatial variability of Pesticide concentrations in the river in relation with the periods of Pesticide application. A large mobilisation of Pesticides was observed during floods (representing more than 80% of the total Pesticide load in August 2007); these results highlight the major role of floods in the transport of Pesticides. The evaluation of Pesticide loads using different sampling strategies (i.e., weekly and monthly punctual; automatic sampling for floods and for weekly composite sampling) and methods of calculation, showed that punctual sampling largely underestimates Pesticides fluxes transiting through the river whereas the weekly composite sampling appears as more representative.
M. Coquery - One of the best experts on this subject based on the ideXlab platform.
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assessing Pesticide concentrations and fluxes in the stream of a small vineyard catchment effect of sampling frequency
Environmental Pollution, 2010Co-Authors: M. Rabiet, C. Margoum, V. Gouy, Nadia Carluer, M. CoqueryAbstract:This study reports on the occurrence and behaviour of six Pesticides and one metabolite in a small stream draining a vineyard catchment. Base flow and flood events were monitored in order to assess the variability of Pesticide concentrations according to the season and to evaluate the role of sampling frequency on the evaluation of fluxes estimates. Results showed that dissolved Pesticide concentrations displayed a strong temporal and spatial variability. A large mobilisation of Pesticides was observed during floods, with total dissolved Pesticide fluxes per event ranging from 5.7 × 10−3 g/Ha to 0.34 g/Ha. These results highlight the major role of floods in the transport of Pesticides in this small stream which contributed to more than 89% of the total load of diuron during August 2007. The evaluation of Pesticide loads using different sampling strategies and method calculation, showed that grab sampling largely underestimated Pesticide concentrations and fluxes transiting through the stream.
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Pesticide transfer dynamics and fluxes in the stream of a small vineyard watershed. Assessing the effect of sampling strategy on fluxes estimation
2008Co-Authors: M. Rabiet, C. Margoum, V. Gouy, N. Caluer, M. CoqueryAbstract:This study reports on the occurrence and behaviour of eight Pesticides and metabolites in a small stream draining a vineyard watershed in the Beaujolais area (France). Punctual and automatic sampling strategies were achieved along the river during one hydrological year in order to assess the spatial and temporal variability of Pesticide concentrations and loads in the river. Flood events were also monitored in order to evaluate the role of hydrological conditions on Pesticide mobilisation. Results show the strong temporal and spatial variability of Pesticide concentrations in the river in relation with the periods of Pesticide application. A large mobilisation of Pesticides was observed during floods (representing more than 80% of the total Pesticide load in August 2007); these results highlight the major role of floods in the transport of Pesticides. The evaluation of Pesticide loads using different sampling strategies (i.e., weekly and monthly punctual; automatic sampling for floods and for weekly composite sampling) and methods of calculation, showed that punctual sampling largely underestimates Pesticides fluxes transiting through the river whereas the weekly composite sampling appears as more representative.
Dana B Barr - One of the best experts on this subject based on the ideXlab platform.
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agricultural Pesticide management in thailand status and population health risk
Environmental Science & Policy, 2012Co-Authors: Parinya Panuwet, Wattasit Siriwong, Tippawan Prapamontol, Barry P Ryan, Nancy Fiedler, Mark G Robson, Dana B BarrAbstract:As an agricultural country and one of the world's major food exporters, Thailand relies heavily on the use of Pesticides to protect crops and increase yields. During the past decade, the Kingdom of Thailand has experienced an approximate four-fold increase in Pesticide use. This increase presents a challenge for the Royal Thai Government in effectively managing and controlling Pesticide use based upon the current policies and legal infrastructure. We have reviewed several key components for managing agricultural Pesticides in Thailand. One of the main obstacles to effective Pesticide regulation in Thailand is the lack of a consolidated, uniform system designed specifically for Pesticide management. This deficit has weakened the enforcement of existing regulations, resulting in misuse/overuse of Pesticides, and consequently, increased environmental contamination and human exposure. This article provides a systematic review of how agricultural Pesticides are regulated in Thailand. In addition, we provide our perspectives on the current state of Pesticide management, the potential health effects of widespread, largely uncontrolled use of Pesticides on the Thai people and ways to improve Pesticide management in Thailand.
M. Rabiet - One of the best experts on this subject based on the ideXlab platform.
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assessing Pesticide concentrations and fluxes in the stream of a small vineyard catchment effect of sampling frequency
Environmental Pollution, 2010Co-Authors: M. Rabiet, C. Margoum, V. Gouy, Nadia Carluer, M. CoqueryAbstract:This study reports on the occurrence and behaviour of six Pesticides and one metabolite in a small stream draining a vineyard catchment. Base flow and flood events were monitored in order to assess the variability of Pesticide concentrations according to the season and to evaluate the role of sampling frequency on the evaluation of fluxes estimates. Results showed that dissolved Pesticide concentrations displayed a strong temporal and spatial variability. A large mobilisation of Pesticides was observed during floods, with total dissolved Pesticide fluxes per event ranging from 5.7 × 10−3 g/Ha to 0.34 g/Ha. These results highlight the major role of floods in the transport of Pesticides in this small stream which contributed to more than 89% of the total load of diuron during August 2007. The evaluation of Pesticide loads using different sampling strategies and method calculation, showed that grab sampling largely underestimated Pesticide concentrations and fluxes transiting through the stream.
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Pesticide transfer dynamics and fluxes in the stream of a small vineyard watershed. Assessing the effect of sampling strategy on fluxes estimation
2008Co-Authors: M. Rabiet, C. Margoum, V. Gouy, N. Caluer, M. CoqueryAbstract:This study reports on the occurrence and behaviour of eight Pesticides and metabolites in a small stream draining a vineyard watershed in the Beaujolais area (France). Punctual and automatic sampling strategies were achieved along the river during one hydrological year in order to assess the spatial and temporal variability of Pesticide concentrations and loads in the river. Flood events were also monitored in order to evaluate the role of hydrological conditions on Pesticide mobilisation. Results show the strong temporal and spatial variability of Pesticide concentrations in the river in relation with the periods of Pesticide application. A large mobilisation of Pesticides was observed during floods (representing more than 80% of the total Pesticide load in August 2007); these results highlight the major role of floods in the transport of Pesticides. The evaluation of Pesticide loads using different sampling strategies (i.e., weekly and monthly punctual; automatic sampling for floods and for weekly composite sampling) and methods of calculation, showed that punctual sampling largely underestimates Pesticides fluxes transiting through the river whereas the weekly composite sampling appears as more representative.
Minghua Zhang - One of the best experts on this subject based on the ideXlab platform.
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evaluation of water quality in an agricultural watershed as affected by almond pest management practices
Water Research, 2008Co-Authors: Xuyang Zhang, Xingmei Liu, Yuzhou Luo, Minghua ZhangAbstract:In the last decade, the detection of organophosphate (OP) Pesticides in the San Joaquin River watershed has raised concerns about water quality. This study examined the influences of almond pest management practices (PMPs) on water quality. The Soil and Water Assessment Tool (SWAT) model was employed to simulate Pesticide concentration in water as affected by different PMPs. California Pesticide Use Reporting (PUR) data were used to investigate PMP use trends. Stepwise regression analysis was performed to test the correlation between specific PMP use and Pesticide concentrations in surface water and sediment. Our results showed an increasing use of reduced risk Pesticides and pyrethroids on almonds. SWAT simulation over the period of 1992-2005 showed decreases in OP concentrations in surface water. High OP and pyrethroid use in dormant sprays was associated with high Pesticide concentrations in water and sediment. Almond Pesticide use was proved to have significant impacts on the Pesticide load in the San Joaquin River watershed. The PMP which combines the use of reduced risk Pesticides with no dormant spray was recommended for almond orchard use. This paper presented a novel method of studying the environmental impacts of different agricultural PMPs. By combining Pesticide use surveys with watershed modeling, we provided a quantitative foundation for the selection of PMPs to reduce Pesticide pollution in surface water.
