Indicator of risk of water contamination by phosphorus from Canadian agricultural land

Bochove, Éric van; Thériault, Georges; Dechmi, Farida; Rousseau, Alain N.; Quilbé, Renaud; Leclerc, Marie-Line; Goussard, N.

doi:10.2166/wst.2006.064

Cited by 19 publications

(24 citation statements)

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“…This paper deals with the P_source, which is one of the two IROWC‐P components, the other being the transport‐hydrology component (van Bochove et al, 2010a). The P_source is defined as the quantity of soluble P that can potentially be desorbed from agricultural soils in runoff and leaching waters and ultimately reach surface water bodies.…”

Section: Methodsmentioning

confidence: 99%

“…For calcareous soils, values representing the very low fertility class in fertilization grids of Alberta, Ontario, and Manitoba were assumed to be close to natural soil P levels. More information can be found in van Bochove et al (2010a). The initial periods, defined as the early stage of intensive agriculture, were fixed according to the historical data available: 1966 for the Atlantic Provinces, Quebec (QC) and Ontario (ON); and 1976 for Manitoba (MB), Saskatchewan (SK), Alberta (AB), and British Columbia (BC).…”

Section: Methodsmentioning

confidence: 99%

“…The FEMS is reported on the provincial scale, whereas LFPS is reported on an ecoregion scale. An extensive description of the P balance assessment is available in van Bochove et al (2010a). The reporting of the CoA variables on SLC polygons represents an aggregation of the data at a finer scale but could include spatial errors when a census division is overlaid by more than one polygon.…”

Section: Methodsmentioning

confidence: 99%

“…However, the need to merge all available soil P information into a single and integrated indicator, referred to as P_source, was essential to develop a national P_source component of the IROWC‐P. The Self‐Davis water extractable P analysis (Pw Self‐Davis) was chosen because in addition to being a relatively simple extraction analysis that can easily be inserted into a soil analysis program, it correlates well with STP and PSI (van Bochove et al, 2010a) and P concentration values in drainage waters by surface infiltration (Self‐Davis et al, 2000) and showed a strong relationship with dissolved P concentration collected runoff waters with Ontario soils (Wang et al, 2010). Also, Pw Self‐Davis shows a strong correlation with the water extractable soil P (Pw) Sissingh analysis (Sissingh, 1971), which relates well with the PSI (P/Al Mehlich III) (van Bochove et al, 2010a).…”

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confidence: 99%

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Risk of Phosphorus Desorption from Canadian Agricultural Land: 25‐Year Temporal Trend

et al. 2012

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Phosphorus (P) use in excess of crop needs may impact surface water quality and contribute to eutrophication. However, P loss from agricultural land to water has never been estimated at the Canadian national scale. In this paper, the risk of P desorption from Canadian agricultural land is assessed by the source component of the indicator of risk of water contamination by P (IROWC-P). The IROWC-P source component (P_source) characterized the mobilization potential of soluble P and integrated four models of P desorption by water for dominant agricultural soil series of Canada on the soil landscape of Canada polygon scale (1:1,000,000). The objective of our study was to describe and evaluate a standardized method for deriving the P_source component. The P_source was assessed over 5-yr intervals from 1981 to 2006 for scientifically based knowledge by relating annual P balance values, soil test P (STP) analyses, soil P saturation index, and Self-Davis water extractable P extraction values. Results show trends of soil P enrichment for most Canadian provinces over the 25-yr period but also an increased percentage of farmland classified above the water extractable soil P environmental threshold of 4 mg P kg. The Canadian Prairies and Ontario showed small P_source values and almost no farmland above the environmental threshold. Quebec and the Atlantic Provinces had P_source values that exceeded the environmental threshold in 2006; more than 33% of farmland is classified above the environmental threshold value.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

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Risk of Phosphorus Desorption from Canadian Agricultural Land: 25‐Year Temporal Trend

et al. 2012

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“…comm.). This method uses data collected in the Census of Agriculture, environmental management surveys, and databases of climatic and hydrological variables to assess the risk of water pollution from both particulate and dissolved P. Inputs to land, regional P balances, and estimates of water soluble P and soil test P are calculated (see detailed methods in van Bochove et al 2006Bochove et al , 2011. Data used in these analyses were estimated from data for soil landscapes of Canada polygons based on the proportion of different soil polygons within the study catchment.…”

Section: Modellingmentioning

confidence: 99%

Phosphorus dynamics across intensively monitored subcatchments in the Beaver River

Baulch

Futter²,

Jin

et al. 2013

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We report results from a spatially intensive monitoring and modelling study to assess phosphorus (P) dynamics in the Beaver River, a tributary of Lake Simcoe, Ontario. We established multiple monitoring stations (9 flow and 24 water quality stations) from headwaters to near the outflow that were operated for 2 field seasons, complementing longer term data from a flow monitoring site and water chemistry monitoring site. We applied the Branched-INCA-P model, which allows fully distributed simulations supported by highly distributed monitoring data. Using spatially distributed data helped better understand variable P and sediment dynamics across the catchment and identify key model uncertainties and uncertainties related to catchment P management. Measured and modelled total P concentrations often exceeded provisional water quality thresholds in many areas of the catchment and highlight the value of studying water quality across multiple subcatchments rather than at a single site. Total P export coefficients differed widely among subcatchments, ranging from 2.1-21.4 kg km −2 y −1 over a single year. Export coefficients were most strongly (negatively) related to the proportion of wetland cover in subcatchments. The INCA-P model captured spatial variation in P concentrations relatively well, but short-term temporal variability in the observed data was not well simulated across sites, in part due to unmodelled hydrological phenomena including beaver activity and unknown drivers of P peaks that were not associated with hydrological events.

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Identification of phosphorus index improvements through model comparisons across topographic regions in a small agricultural watershed in Vermont (USA)

Twombly¹,

Faulkner

Collick

et al. 2021

Soil Science Soc of Amer J

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Many U.S. states require farmers to evaluate the risk of P loss from farm fields using P site assessment tools, such as the Phosphorus Index (P-Index). The simplicity of the P-Index allows for users with various backgrounds to utilize the tool; however, the P-Index may be limited in its ability to reliably predict P losses across variable farm terrain, for instance where saturation-excess runoff generation dominates. The objective of this study was to identify potential improvements that could be made to the Vermont P-Index (VT P-Index) by comparing VT P-Index predictions of P loss with those of a model that considers topographic controls on P transport. Scenarios with varying P management strategies were developed and modeled for corn (Zea mays L.) silage production fields in a small agricultural watershed (360 ha) located in Vermont using both the VT P-Index and a modified version of the Soil and Water Assessment Tool (SWAT). Modeled outputs from both the VT P-Index and SWAT were aggregated based on topographic index (TI) class and compared for the directional agreement of P risk assessments and relative annual average dissolved and particulate P losses. The P-Index nutrient management recommendations gave higher P loss risk ratings than SWAT for 94% of the 120 unique scenario combinations simulated. Results from this study suggest that the VT P-Index could improve its ability to support farm nutrient management planning by incorporating topographic controls on runoff production into its estimation of P transport.

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Indicator of risk of water contamination by phosphorus from Canadian agricultural land

Cited by 19 publications

References 0 publications

Risk of Phosphorus Desorption from Canadian Agricultural Land: 25‐Year Temporal Trend

Risk of Phosphorus Desorption from Canadian Agricultural Land: 25‐Year Temporal Trend

Phosphorus dynamics across intensively monitored subcatchments in the Beaver River

Identification of phosphorus index improvements through model comparisons across topographic regions in a small agricultural watershed in Vermont (USA)

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