By the same authors

Influence of kinetic sorption and diffusion on pesticide movement through aggregated soils

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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Publication details

Title of host publicationPESTICIDE IN AIR, PLANT, SOIL & WATER SYSTEM
DatePublished - 2003
Pages211-216
Number of pages6
PublisherLA GOLIARDICA PAVESE
Place of Publication27100 PAVIA
EditorsAAM DelRe, E Capri, L Padovani, M Trevisan
Original languageEnglish
ISBN (Print)88-7830-359-3

Abstract

Laboratory studies were carried out to investigate the availability of isoproturon for leaching at different times from application depending on initial soil moisture status. Initially dry and initially wet aggregates of a heavy clay soil were treated with the pesticide and incubated at 90% field capacity and 15degreesC. Samples were taken at intervals, filled into small leaching columns and irrigated. Soil water was extracted from parallel samples by centrifugation to characterise the fraction of isoproturon available for leaching under natural moisture conditions. Total soil residues were determined at each interval. Isoproturon losses in leachate decreased with time. The rate of decrease was similar to that for the mass in soil water which suggested that the centrifugation technique used may be suitable to characterise the fraction of the pesticide that is readily available for leaching. Leaching losses declined faster than would be expected from degradation alone. This phenomenon is likely to be caused by diffusion of the pesticide into soil aggregates where it is less available for leaching and time-dependent sorption processes. There was no significant influence of soil moisture conditions at the time of application on the leaching of isoproturon or its availability in soil water.

    Research areas

  • kinetic sorption, diffusion, leaching, soil structure

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