Risk to soil and water quality from agriculture indicator: data sources and methods, chapter 5
5. Caveats and limitations
A full description of limitations associated with individual indicators is available in Agriculture and Agri-Food Canada's Agri-Environmental Indicator Report Series - Report #4. The limitations applying directly to the soil and water quality indices include:
- The indicator for soil contamination by trace elements was only calculated for 1981 and 2006. For all other years, an interpolated value was included in the index calculation.
- The national indices are calculated using indicator models developed at a local level, which were scaled-up to the national scale. There is little independent experimental data with which to validate or calibrate the model results.
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