SOIL CHEMISTRY IN RELATION TO THE NEW ZEALAND GENETIC SOIL CLASSIFICATION

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Abstract
The New Zealand genetic soil classification was developed to reflect the impress of the local soil-forming factors on predominantly young geological materials. Marked climatically controlled zonality was evident on normal sites and on normal (acid-intermediate) parent materials, while intrazonal character was exhibited by soils derived from unusual parent materials (volcanic rocks, limestone, etc.), and azonal character by soils on unstable sites. Soil parent material and degree of soil development were reflected in the clay mineralogy and the soil chemistry. Topsoil and subsoil values for the stable chemical parameters phosphate retention, absorbed sulfate, long-term K supplying power (Kc) and reserve magnesium (Mgr), all show marked differences among genetic groups or subgroups.

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