Soil testing for phosphorus: comparing the Mehlich 3 and Colwell procedures for soils of south-western Australia.

Australian Journal of Soil Research | November 1, 2003| | Copyright

Introduction

When first cleared for agriculture, most soils of south-western Australia were acutely deficient in phosphorus (Wild 1958; McArthur 1991). Regular applications of superphosphate and ammonium phosphate fertilisers have been required first to increase and then to maintain the P status of the soils for profitable agricultural production (Bolland 1998). The Colwell (1963) procedure, a modified version of the original Olsen et al. (1954) sodium bicarbonate soil test for E is used in Western Australia to estimate the current P status of soils when providing P ...

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