More links and websites
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Aerial topdressing
This Wikipedia article covers the history of aerial topdressing in New Zealand and overseas.
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Code of Practice for Nutrient Management
The 2007 code of practice addresses fertiliser use in the context of nutrient management.
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New Zealand Fertiliser Quality Council
This page sets out information about the Spreadmark programme.
More suggestions and sources
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Alexander, G., and J. S. Tullett. The super men. Wellington: A. H. & A.W. Reed, 1967.
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Campbell, D. A. ‘Preliminary aerial distribution trials with superphosphate and seed mixtures.’ New Zealand Journal of Science and Technology 30, no. 2 (1948): 65–77.
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Ewing, Ross, and Ross Macpherson. The history of New Zealand aviation. Auckland: Heinemann, 1986.
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Geelen, Janic. The topdressers. Te Awamutu: New Zealand Aviation Press, 1983.
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Ground and aerial spreading of phosphate rock material as a direct application fertiliser in New Zealand. Massey University Occasional Report 3. Palmerston North: Massey University, 1981.