Figure 4.5: Summary data for total N and dissolved reactive P from the NRWQN over a 17-year period (1989-2005)

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This figure shows dissolved reactive phosphorus (DRP) and total nitrogen trends. All except the least enriched rivers show an increasing trend in concentrations of total nitrogen. DRP shows an increasing trend for the 80th percentile but this is not very strong. DRP concentrations in our most enriched rivers peaked in the late 1990s and has subsequently trended downwards so that concentrations in 2005 are similar to those observed in 1989.