Abstract
Abstract Forty-eight Waikato soils representing six major New Zealand soil groups (yellow-brown earths, yellow-brown loams, yellow-brown pumice soils, brown-granular loams, gley, and organic soils) were incubated with Jordan phosphate rock (PR) with and without elemental sulphur (S) at 25°C for 10 weeks. S was determined by a recently developed high performance liquid chromatography procedure. Inorganic phosphorus (P) in bicarbonate extracts (Olsen Pi) increased significantly in PR and PR + S treatments, indicating that some Jordan PR was dissolved. The amount of organic P in bicarbonate extracts (Olsen P0) from the PR + S treatment was significantly larger than control and PR treatments. There was no significant increase in numbers of PR-dissolving bacteria in PR and PR + S treatments after 10 weeks' incubation. Soil pH and Olsen Pi were useful predictors of the relative dissolution of PR among the soil groups. S was oxidised in all soils. Among the soil groups from the S treatment, the gley soils were t...
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