Comparison of isotopic exchange kinetics and extraction methods for determining phosphorus availability in grassland soils

Abstract

Chemical extraction methods are widely used to determine plant available soil phosphorus (P). However, these methods can only provide an approximate measure of potentially available P (Fardeau, 1996). The objectives of this study were to investigate the use of isotopic exchange kinetics (IEK) to assess P availability in a range of grassland soils and to compare IEK with chemical extraction.