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Data Sources and Methods for the Soil and Water Quality Indicators for Agriculture

Caveats and limitations

A full description of limitations associated with individual indicators is available in AAFC’s Agri-Environmental Indicator Report Series, Report #3. 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 years in between, an interpolated value was included in the index calculation. 
  • The national indices are calculated using indicator models developed at a local level. These results are scaled-up to the national scale, which can result in the loss of the ability to determine actual physical causes of problems in specific locations.