title: Indicator of risk of water contamination by phosphorus from Canadian agricultural land.
abstract: 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. Firstly developed for the province of Quebec (2000), this paper presents an improved version of IROWC_P (intended to be released in 2008), which 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: (i) create a soil phosphorus saturation database for dominant and subdominant soil series of SLC polygons--the soil P saturation values are estimated by the ratio of soil test P to soil P sorption capacity; (ii) calculate an annual P balance considering crop residue P, manure P, and inorganic fertilizer P--agricultural and manure management practices will also be considered; and (iii) 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).
authors.affiliation: Agriculture and Agri-Food Canada, Soils and Crops Research and Development Centre, 2560 Hochelaga Boulevard, Sainte-Foy, Quebec G1V 2J3, Canada. vanbochovee@agr.gc.ca
authors.forename: E
authors.initials: E
authors.lastname: van Bochove
authors.forename: G
authors.initials: G
authors.lastname: Thériault
authors.forename: F
authors.initials: F
authors.lastname: Dechmi
authors.forename: A N
authors.initials: AN
authors.lastname: Rousseau
authors.forename: R
authors.initials: R
authors.lastname: Quilbé
authors.forename: M L
authors.initials: ML
authors.lastname: Leclerc
authors.forename: N
authors.initials: N
authors.lastname: Goussard
mesh_terms: D000383:Agriculture / Q000379:methods; D000465:Algorithms; D002170:Canada; D003247:Conservation of Natural Resources; D016208:Databases, Factual; D004784:Environmental Monitoring; D005308:Fertilizers; D010758:Phosphorus / Q000032:analysis*; D012306:Risk; D012987:Soil; D012989:Soil Pollutants; D014872:Water Movements; D014873:Water Pollutants; D014874:Water Pollutants, Chemical / Q000032:analysis*; D014876:Water Pollution
chemical_list: D005308:Fertilizers; D012987:Soil; D012989:Soil Pollutants; D014873:Water Pollutants; D014874:Water Pollutants, Chemical; D010758:Phosphorus