Relations entre la vitesse de dégradation du propyzamide et les propriétés physicochimiques des sols

Barrere, C.; Bastide, J.; Coste, Camille

doi:10.1111/j.1365-3180.1988.tb00791.x

Cited by 3 publications

(1 citation statement)

References 11 publications

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“…The persistence of propyzamide varies, depending on a soil type, climatic conditions, and decomposition; and it decomposes by photodecomposition and volatilization from soil surfaces under very hot and dry conditions [23]. The addition of mineral fertilizers to soil inhibited propyzamide degradation by decreasing its resistivity [39]. In our study, after the biological preparation was added to soil, the substance half-life was extended by 4.3 days (12.6%) (experiment 1), and reduced by 12.1 days (22.4%) (experiment 2) ( Table 2).…”

Section: Propyzamidementioning

confidence: 99%

Influence of a Commercial Biological Fungicide containing Trichoderma harzianum Rifai T-22 on Dissipation Kinetics and Degradation of Five Herbicides in Two Types of Soil

et al. 2020

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Biological crop protection is recommended to be applied alternately or together with chemical one, to protect human health from the excessive use of toxic pesticides. Presence of microorganisms can influence the concentration of chemical pollutants in soil. The aim of this study is to estimate the influence of a commercial biological fungicide containing Trichoderma harzianum Rifai T-22 on dissipation kinetics and degradation of five herbicides belonging to different chemical classes: clomazone, fluazifop-P-butyl, metribuzin, pendimethalin, and propyzamide, in two types of soil. Results of the study revealed that T. harzianum T-22 influences pesticide degradation and dissipation kinetics of the non-persistent herbicides: clomazone, fluazifop-P-butyl, and metribuzin. In soil with a higher content of nitrogen, phosphorus, and organic matter, degradation increased by up to 24.2%, 24.8%, and 23.5% for clomazone, fluazifop-P-butyl, and metribuzin, respectively. In soil with lower organic content, degradation was on a low level, of 16.1%, 17.7%, and 16.3% for clomazone, fluazifop-P-butyl, and metribuzin, respectively. In our study, the addition of the biological preparation shortened herbicide dissipation half-lives, from 0.3 days (2.9%) for fluazifop-P-butyl, to 18.4 days (25.1%) for clomazone. During the degradation study, no significant differences were noticed for pendimethalin, belonging to persistent substances. Biological protection of crops can modify pesticide concentrations and dissipation rates. On one hand, this may result in the reduced effectiveness of herbicide treatments, while on the other, it can become a tool for achieving cleaner environment.

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Section: Propyzamidementioning

confidence: 99%

Influence of a Commercial Biological Fungicide containing Trichoderma harzianum Rifai T-22 on Dissipation Kinetics and Degradation of Five Herbicides in Two Types of Soil

et al. 2020

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Influence of pH-dependent sorption and transformation on simulated pesticide leaching

Linden

Tiktak

Boesten

et al. 2009

Science of The Total Environment

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Guidance for evaluating laboratory and field dissipation studies to obtain DegT50 values of plant protection products in soil

2010

EFS2

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The European Commission asked the Panel to revise the Guidance Document on persistence in soil (SANCO/9188VI/1997 of 12 July 2000). Therefore the Panel started the development of a revised methodology for the assessment of exposure of soil organisms. This opinion provides guidance on how to derive the half-life for degradation in the top 30 cm of soil at reference temperature and moisture conditions (i.e. 20 o C and field capacity) from the results of field studies in which the plant protection product was sprayed onto the soil surface. This half-life is an important input parameter in model simulations of the exposure of organisms in soil for annual crops under conventional and reduced tillage and therefore this guidance is an important part of this revised methodology. The Panel proposes the splitting of field dissipation studies into two parts viz. before and after at least 10 mm of rain has fallen since application. The Panel recommends evaluating field dissipation studies with models capable of considering a biphasic decline and taking only the slow phase of this decline, taken to represent degradation in the soil matrix rather than loss processes from the soil surface, into account for estimating this half-life. If however, surface processes do not seem to occur the Panel proposes to use single first-order kinetics after eliminating data points before 10 mm of rain has fallen. The Panel proposes basing the relevant population of half-lives for a certain soil exposure scenario on the assumption that a half-life measured for any non-volcanic agricultural soil from temperate regions can be used to predict the half-life for any such soil within the EU. The aim is to estimate the geomean half-life of this relevant population. The Panel considers it necessary to include the uncertainty resulting from the sample size of the population in the estimation of this geomean. If the relevant population of half-lives for a certain exposure scenario consists of a mixture of values obtained in the laboratory and in the field, the Panel recommends rejecting the laboratory values only if the null hypothesis that laboratory and field half-lives are equal is rejected. The Panel considers that this guidance will also be useful to determine half-lives to be used in scenario calculations for the assessment of leaching to groundwater and surface water. Should the notifier want to use results of field dissipation studies for estimating . This revision will consist of a tiered exposure assessment for organisms in soil (for annual crops under conventional and reduced tillage) based on scenarios for analytical and numerical models (EFSA, 2010b). In this exposure assessment, degradation parameters derived from field dissipation and soil accumulation studies are important input parameters for the numerical models. Therefore this opinion aims to provide guidance on best practice for using the results of standard field studies and soil accumulation studies in which plant protection products have been sprayed on the soil surface.T...

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Relations entre la vitesse de dégradation du propyzamide et les propriétés physicochimiques des sols

Cited by 3 publications

References 11 publications

Influence of a Commercial Biological Fungicide containing Trichoderma harzianum Rifai T-22 on Dissipation Kinetics and Degradation of Five Herbicides in Two Types of Soil

Influence of a Commercial Biological Fungicide containing Trichoderma harzianum Rifai T-22 on Dissipation Kinetics and Degradation of Five Herbicides in Two Types of Soil

Influence of pH-dependent sorption and transformation on simulated pesticide leaching

Guidance for evaluating laboratory and field dissipation studies to obtain DegT50 values of plant protection products in soil

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