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In 1979 the total fertiliser sold was 354,671 tonnes, with superphosphate at 326,296 tonnes, or 92%. By 2003 total tonnage had increased to 1.638 million, and superphosphate to 900,952 tonnes – but this now formed only 55% of the market. The nitrogen-containing fertilisers urea and diammonium phosphate (DAP) now formed 28% of the fertilisers used.
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Te Ara - The Encyclopedia of New Zealand
Source: New Zealand Fertiliser Manufacturers Association
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