The Nutrient Export Risk Matrix (NERM) is a decision support
tool to allow farmers and land use planners to assess the risk of nutrient loss from their
land and to explore options to reduce nutrient loss whilst maintaining farmer income.
If we assume that the soil type within your field is the same then we only need to
use a 2-dimensional matrix such as the Phosphorus Export Risk Matrix (PERM)
given below.
The goal is to allow farmers to compare their current land use practice within the wider
context of alternative land management options.
2D Phosphorus Export Risk Matrix
The 2D PERM shown below is one designed for arable farming in an area where
groundwater effects are important, hence
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Examples
Click on coloured squares for examples
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High flow-connectivity risk, high risk
due to fertiliser application
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Low flow-connectivity risk, low risk
due to fertiliser application
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groundwater dominated system with high risk
of phosphorus reaching receiving channels
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groundwater dominated system with low risk
of phosphorus reaching receiving channels
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Right click here to download pilot version of
the PERM in Excel
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© Caspar Hewett and Paul Quinn
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