Data description

Monitoring of agricultural catchments

Last changed: 27 August 2024

Data from the programme Monitoring agricultural catchments include long time series on water chemistry, with high temporal resolution, from sampling of streams and groundwater in agriculturally dominated catchments throughout the country.

Monitoring agricultural catchments is a sub-programme within the Swedish Environmental Protection Agency's environmental monitoring of agricultural land. The aim of the programme is to investigate water quality in watercourses in a number of small areas dominated by agriculture. The areas have been selected to represent different cropping patterns and soil regions. The investigations are mainly focused on nitrogen and phosphorus losses from arable land to surface waters.

Surface water samples are taken every two weeks and concentrations of nitrogen, phosphorus and suspended solids are analysed.

  • The catchment areas vary in size between 200 and 3 300 hectares.
  • Sampling has been taking place since the 1980s or 90s.
  • Currently, 18 catchments are included in the programme. The dataset also includes data from catchments previously included in the monitoring programme.
  • Eight catchments are investigated more intensively. Among other things, groundwater is also analysed there. In addition, farmers are interviewed annually about crops and cultivation practices in each field within the catchment.
  • In four of the intensively investigated catchments, amount of pesticide residues in the water is also analysed.

Data from the survey is used to provide a broad picture of variations within the country and is an important source of knowledge with regard to the impact of Swedish agriculture on water quality. Data from the survey is also used to calibrate models used to estimate agricultural nutrient leaching at the national level.

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