Inorganic phosphorus fractions in south island soils and their solubility in commonly used extracting solutions

摘要

Inorganic phosphorus in three groups of South Island soils has been fractionated into aluminium-, iron-, and calcium-bound forms. Results show that Taitapu gley soils and Waimakariri recent soils in general contain the major part of their phosphorus in calcium-bound form; zonal soils contain a much lower proportion of this form. Highly significant relationships were found between the soil pH and the proportion of calcium-bound phosphorus for the Taitapu soils and for the zonal soils. This relationship approached significance for the Waimakariri soils.