There are 14 main soil types in the North Island. Granular and Oxidic soils are limited to the warmer Northland and South Auckland regions, while Allophanic soils and Pumice soils derived from volcanic ash are concentrated in the central North Island. Pallic soils are in the southern districts. Each type of soil has different fertiliser requirements.
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Source: Les Molloy, Soils in the New Zealand landscape: the living mantle. 2nd ed. Lincoln: New Zealand Society of Soil Science, 1998, p. 230