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Figure 9.5: Sources of nitrogen and phosphorus in agricultural catchments, 1985–2004

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(1) N = nitrogen.

(2) P = phosphorus.

Data source: Ministry of Agriculture and Forestry.

Text description of figure

Figure 9.5 shows a graph with the changes in nitrogen and phosphorus inputs to agricultural catchments, measured in thousands of tonnes, between 1985 and 2004.  Inputs include nitrogen and phosphorus from fertilisers and livestock manure respectively.