Granulated superphosphate fertiliser is inspected as it is fed into a one-tonne bag. About 90% of superphosphate is transported to ground-spread depots and hill-country bins for aerial topdressing. About 8% is put into one-tonne bags for helicopter operators, orchardists, market gardeners and small-scale farmers who apply their own fertiliser. A small proportion leaves the fertiliser works in 40-kilogram bags for use in gardens or on lifestyle blocks.
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by David Vernon
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