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Materials and methods

  • We have analyzed spatial data on crops areas, livestock and human population from data bases of boards of agriculture and boards of Statistic. 
  • We have collected nutrient demand of different crops (per hectare) and excretions by humans and livestock (per individual) from literature.
  • We have used following equation for calculating nutrient balance at selected spatial scale:

                Nutrients Balance = nutrient in excrements (of human and livestock) - Nutrient demand by crops

  • We have used Microsoft Excel (Visual Basic programming), Microsoft Access and Arc map (10.1) in the analysis.  

Responsible for this page: Agneta Johansson
Last updated: 06/09/14