Abstract
The Pi, Colwell, Bray 1, calcium acetate lactate (CAL) and Truog phosphorus (P) soil test reagents were assessed in two field experiments on lateritic soils in Western Australia that had been fertilized four years previously (1984) with triple superphosphate, North Carolina rock phosphate, Queensland rock phosphate, and in one experiment, Calciphos. Soil samples to measure soil P test were collected February 1987. Soil P test was related to seed (grain) yields measured later in 1987. Different crop species were grown on different sections of the same plot at each site. The species were lupins (Lupinus angustifolius), barley (Hordeum vulgare) and oats (Avena sativa) at one site, and lupins, oats, triticale (×Triticosecale) and rapeseed (Brassica napus) at the other site. For each reagent, the soil P test calibration, which is the relationship between yield, expressed as a percentage of the maximum yield, and soil P test, generally differed for different plant species and for different fertilizer types. Variations in soil P test required to produce half the maximum yield of each species at each site was least for the CAL reagent followed by the Colwell reagent.
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References
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Bolland, M.D.A., Kumar, V. & Gilkes, R.J. A comparison of five soil phosphorus tests for five crop species for soil previously fertilized with superphosphate and rock phosphate. Fertilizer Research 37, 125–132 (1994). https://doi.org/10.1007/BF00748553
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DOI: https://doi.org/10.1007/BF00748553
Key words
- Pi, Colwell, Bray 1, calcium acetate lactate (CAL), and Truog soil test reagents
- triple superphosphate, North Carolina rock phosphate, Queensland rock phosphate, and Calciphos rock phosphate
- lupins (Lupinus angustifolius), barley (Hordeum vulgare), oats (Avena sativa), triticale (×Triticosecale) and rapeseed (Brassica napus) plant species