PW06 Life-Cycle Assessment
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(PW093) Development of a phosphorus indicator to assess impact of agricultural beneficial management practices on water quality at the national scale.

van Bochove, E.1, Thériault, G.1, Dechmi, F.1, Rousseau, A.N.2, Quilbé, R.2, Leclerc, M.L.1, Goussard, N.1, 1 Agriculture and Agri-Food Canada, Soils and Crops Research and Development Centre, Sainte-Foy, Québec, Canada2 Institut national de la recherche scientifique, Eau, Terre et Environnement, Sainte-Foy, Québec, Canada

ABSTRACT- Excessive amounts of P in surface fresh water contribute to eutrophication of rivers and lakes. The contamination of water is of greatest concern in areas where soil tests show high P levels, ability of soils to retain P is low, susceptibility to runoff, macropore flow, and soil erosion are high, and where connectivity to surface water and artificial drainage is dense. The indicator of risk of water contamination by phosphorus (IROWC-P) is designed to estimate where the risk of water P contamination by agriculture is high, and how this risk is changing over time based on the five-year period of data Census frequency. Ultimately, IROWC-P will be used to assess the effects of beneficial management practices and integrate them with a CRAM type model (canadian regional Agricultural Model) in order to make quantitative assessments of policy scenarios with regard to their impacts on soil and water quality. Firstly developed for the province of Quebec (2000), this paper presents an improved version of IROWC-P (intended to be released in 2008) that will be extended to all watersheds and Soil Landscape of Canada (SLC) polygons (scale 1:1 000 000) with more than 5% of agriculture. There are three objectives: Create a soil phosphorus saturation database for dominant and sub-dominant soil series of SLC polygons. The soil P saturation values are estimated by the ratio of soil test P on soil P sorption capacity. Calculate an annual P balance considering crop residue P, manure P, and inorganic fertilizer P. Agricultural and manure management practices will also be considered. Develop a transport-hydrology component including P transport estimation by runoff mechanisms (water balance factor, topographic index) and soil erosion, and the area connectivity to water (artificial drainage, soil macropores, and surface water bodies).

Key words: phosphorus, diffuse pollution, indicator of risk, beneficial management practices

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