Abstract
The initial and residual effectiveness of two partially acidulated fertilisers, a single superphosphate (SSP): reactive phosphate rock (RPR) physical mix (SSP:RPR) and a partially acidulated phosphate rock (PAPR), and a RPR, North Carolina, were compared with SSP at two phosphate (P)-responsive sites in hill country. One site had received small annual inputs of SSP (125 kg ha−1 y−1) fertiliser for 10 years (LF) and the other site no SSP in the past 5 years (NF). The SSP, PAPR and RPR were applied at 3 rates (20, 40 and 60 kg P ha−1) and SSP:RPR at one rate (40 kg P ha−1) once only in the first year. Fertiliser treatments were applied with or without ‘Grasslands Huia’ white clover (Trifolium repens L.) seed. Initial and residual pasture and legume responses were measured over two years.
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