Computed leaching of pesticides from soil under field conditions

Leistra, M.; Dekkers, W.A.

doi:10.1007/bf00280848

Cited by 14 publications

(8 citation statements)

References 7 publications

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“…In contrast, spring applications are followed by higher temperatures, faster degradation, and relatively little net downward water flow. One‐year simulations with a pesticide leaching model34 for a Dutch scenario representing a sandy soil without macropore flow predicted that autumn application would result in greater leaching than application in spring 24. This was especially the case for compounds with low sorption and short half‐lives, where autumn application resulted in 100 times greater leaching to tile drains than did spring application.…”

Section: Resultsmentioning

confidence: 99%

Quantifying interactions between compound properties and macropore flow effects on pesticide leaching

Larsson¹,

Jarvis²

2000

Pest Manag. Sci.

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The objective of this study was to investigate the interactions between compound properties and macropore flow effects on pesticide leaching. To this end, the dual‐porosity MACRO model was used to simulate leaching of 60 hypothetical compounds with widely differing sorption and degradation characteristics using a pre‐calibrated scenario from Lanna, south‐west Sweden, representing a structured clay soil. The model predicts that, in the worst case, macropore flow increases leaching by more than four orders of magnitude for moderately to strongly sorbed compounds with relatively short half‐lives. However, it was also notable that leaching of some very mobile compounds is actually reduced by macropore flow. For pesticides leaching between 0.0001 and 10% of the applied dose (without macropore flow), the impact of pesticide properties on leaching is markedly reduced. This suggests that reductions in applied dose become a relatively more attractive and effective means of decreasing leaching from structured soils. © 2000 Society of Chemical Industry

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Section: Resultsmentioning

confidence: 99%

Quantifying interactions between compound properties and macropore flow effects on pesticide leaching

Larsson¹,

Jarvis²

2000

Pest Manag. Sci.

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“…One of the causes for the difference was the greater amount of water evaporated under the field conditions; but even after taking this into account, there remained a clear difference in mobility. The distribution of the herbicide bromacil under field conditions in the top 120 cm of orchard soils was measured by Leistra et al (1975). Mobility was found t o be much less than expected from the published mobility data obtained for bromacil in soil thin layer experiments.…”

Section: Introductionmentioning

confidence: 84%

“…For the rate coefficient kA of adsorption, values were introduced of 1.0, 4.0, and 16 day-', respectively. Local adsorption-desorption equilibration with these rate coefficients in soil systems was described by Leistra and Dekkers (1977).…”

Section: Model 2: First-order Rate Equations For Adsorption and Desormentioning

confidence: 99%

“…With systemic insecticides/nematicides, a great deal of redistribution in soil is often necessary for an adequate protection of the root system and above-ground plant parts. To assess the risk of leaching through the soil t o ground-and surface-water, a quantitative description of movement and availability is needed (Leistra and Dekkers, 1976).…”

Section: Introductionmentioning

confidence: 99%

“…Special attention was paid t o the consequences of different initial conditions for the pesticides, and to the effect of a scattered pattern o f water supply as met under rainfall conditions. Some models for the adsorptiondesorption kinetics of pesticides in soil systems were discussed b y Leistra and Dekkers (1977). These descriptions are incorporated into the present models.…”

Section: Introductionmentioning

confidence: 99%

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Computed Effects of Adsorption Kinetics on Pesticide Movement in Soils

Leistra¹,

Dekkers

1977

Journal of Soil Science

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For a model at high water fluxes, the inclusion of first-xder adsorptiondesorption rate constants leads to slower leaching of pesticide and increased spread than predicted using instantaneous equilibrium. The initial condition of the substance near the soil surface is also found to be important.A model with simultaneous fast and slow adsorptiondesorption equilibria describes and explains published experimental data comparatively well. Under a pattern of intermittent rainfall, the effect of adsorptiondesorption kinetics on pesticide movement is comparatively small.

show abstract

Quantifying interactions between compound properties and macropore flow effects on pesticide leaching

Larsson

Jarvis

2000

Pest. Manag. Sci.

View full text Add to dashboard Cite

Computed leaching of pesticides from soil under field conditions

Cited by 14 publications

References 7 publications

Quantifying interactions between compound properties and macropore flow effects on pesticide leaching

Quantifying interactions between compound properties and macropore flow effects on pesticide leaching

Computed Effects of Adsorption Kinetics on Pesticide Movement in Soils

Quantifying interactions between compound properties and macropore flow effects on pesticide leaching

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