The first trials of aerial topdressing were organised by Doug Campbell of the Soil Conservation and Rivers Control Council. The aim was to grow better pastures on hill land prone to erosion, as Campbell’s 1955 bulletin suggests. As it turned out, aerial topdressing also transformed the economics of farming all hill country.
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Reference:
Eric Pawson and Tom Brooking, Environmental histories of New Zealand. Melbourne: Oxford University Press, 2002, p. 194
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