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Abstract
Agricultural production, by its nature, impacts both positively and negatively on the
environment. Impacts can be point source or diffuse; however all should be
considered in performance measurement.
To estimate potential environmental impacts from the use of nitrogen fertilizer, a
biophysical model of dairy grazing systems, DairyMod, is used to simulate individual
farming practices and determine the likely extent of leaching and run-off from each
farm. Although not the only environmental impacts of farming, leaching and run-off
are two variables that can be measured and combined with other marketed inputs to
determine farm performance.