Eutrophication From Agricultural Sources: Models And Risk Assessment Schemes For Predicting Phosphorus Loss To Water

Final Report - ERTDI Report 43 - Daly

Summary: Eutrophication study using three modelling approaches to capture a range of modelling complexities and methodologies that could be applied to Irish data. The three modelling studies captured physically based, empirical and risk assessment (multi-criteria) models.

Published: 2006

ISBN: 1-84095-179-6

Pages: 23

Filesize: 729KB

Price: Free to download / €10 for a printed version

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Phosphorus from agricultural sources is a component of diffuse P pollution delivered to surface waters in Ireland.

Understanding the sources and pathways of P loss from grassland soils has become the central theme of much of the research undertaken at laboratory, field and catchment scales in recent years.

Mechanistic and process-orientated research on soil P cycling and hydrological pathways tends to be carried out in isolation at laboratory and field scales.

Catchment-scale research allows an integration of sources and pathways of P loss that provides an understanding of how these processes interact and contrive to deliver losses to water.

Modelling P loss from catchments moves P research from a fundamental level to an applied level, so that results can provide a decision support for catchment managers.

Recognised processes in soil P pools and hydrological pathways are combined with agricultural activities (landuse patterns, P usage, timing of applications, stocking density) to generate predictive amounts of P in surface waters.

Catchment characteristics, such as arrangement of soil types, land-use patterns and rainfall, can be incorporated into some models to provide a profile of a catchment to determine losses based on the catchment’s response to P sources and water movement.

Full executive summary in report.