Abstract
The extent and rate of dissolution of Sechura rock phosphate in 30 soils from Brazil, Colombia, Australia and Nigeria were measured. There was an initial rapid dissolution within 1 day, and this was followed by slower dissolution up to 124 days. For all soils an increase in the level of rock phosphate resulted in a smaller proportion dissolving. After 31 days, the percentage dissolved differed widely between soils and for rock phosphate application levels of 0.34 and 34 mg g-1 soil ranged over 0-100%, and 0-21% respectively. Pyrophosphate and oxalate-extractable iron and aluminium were important soil properties for predicting the amount of rock phosphate dissolution; pH, organic carbon, silt content and exchangeable calcium were subsidiary predictive properties for some soils.
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