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Story: Topdressing

First topdressing trials

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The first aerial topdressing trials were made at Ōhakea in 1948. A New Zealand Air Force Avenger torpedo bomber was fitted with a reserve petrol tank modified to carry and release fertiliser. Trays were laid on the ground to measure the rate and spread of the fertiliser. Conclusions were so encouraging that further trials were planned – and the aerial topdressing industry was born.

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Archives New Zealand - Te Rua Mahara o te Kāwanatanga

Reference: Weekly Review 370. National Film Unit, 1948

Permission of Archives New Zealand Te Rua Mahara o te Kāwanatanga must be obtained before any re-use of this material.

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How to cite this page

John Maber, Topdressing – Origins of aerial topdressing, Te Ara – the Encyclopedia of New Zealand, https://teara.govt.nz/en/video/16553/first-topdressing-trials (accessed 24 June 2026).

Story by John Maber, published 1 March 2009.