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Pesticide Mobility ; Particulate transport of pesticide residues. - PL0507

This work is in collaboration with ADAS Soil and Water
Research Centre (PL0505), MAFF Central Science Laboratory
(PL0506), NERC Institute of Freshwater Ecology and the

University of Reading Institute for Sedimentology(PL0513).

A number of recent studies have monitored and quantified the movement of agriculturally applied pesticides to surface waters.However, most of these studies
have focused on the presence of pesticide residues in bulk water samples and have
not attempted to separate the impacts of pesticides transported on particulate material from those transported in solution. Whilst the transport of pesticides on particulate material is recognised as being an important process, particularly for the
more strongly adsorbed compounds, there is little research available in the UK on its national significance, on the factors that effect it, or on the measures which might control it.The objective of this project is to work in collaboration with ADAS Soil and Water Researcg Centre, MAFF Central Science Laboratory, NERC Institute of Freshwater Ecology and the University of Reading Postgarduate Research Institute for Sedimentology, to establish the national significance of particulate transport of pestiicde residues: to develop, modify andvalidate predictive models of such particulate transport and to suggest some basicmanagement guidelines for minimising it as a potential source of surface watercontamination. SSLRC’s specific research will be to establish the relationships between rainfall, antecedent moisture content, surface run-off and sediment loss,for a range of soil types, land uses and management practices. Particular emphasiswill be placed on studying soils conforming to a range of hydrological classes defined in the Hydrology Of Soil Types (HOST) system which will be the basis for a national extrapolation of the established relationships.
Objectives Starting date Completion date

1.(a) To undertake a literature search
to identify data sources relating to rainfall
/ run off/ sediment load relationships July 1994 Dec.1994
relevant to UK conditions.

1.(b) To make a detailed study of the
rainfall, soil moisture content ,run-off
and sediment loss relationships on 10
soil types representing a range of Sept 1994 Sept 1997
hydrological classes under arable cultivation
in England and Wales.

2. To undertake basic analysis of
sediment samples collected both during
objective 1 and also by SWRC and IFE
as part of their work within the collaborative
project. Analysis of particle -size distribution, Nov1994 Sept 1997
organic carbon content and pH will be

3.To use the information generated in
objective 1 to develop and validate
models of rainfall/ run-off/ sediment
load relationships and to use these
models to modify existing models April 1995 Dec. 1997
of pesticide transport or to develop
new ones.

4.To work with SWRC, using the
models developed during objective
3, to develop and test basic management
strategies for reducing particulate transport
of pesticides to surface waters and to
assess the potential impact of these strategies Jan 1996 March 1998
at the catchment , regional and national levels.
Time-Scale and Cost
From: 1994

To: 1998

Cost: £204,000
Contractor / Funded Organisations
Soil Survey and Land Research Centre
Arable Farming              
Fields of Study
Pesticide Safety