Validation of critical soil-test phosphorus values from the Better Fertiliser Decisions for Pastures meta-analysis
In: https://doi.org/10.1071/CP23194, 2024
academicJournal
Zugriff:
Context. Historical application of phosphorus (P) fertilisers has enabled grazing agriculture in south-west Western Australia but has led to excessive soil P levels that pose a eutrophication risk. However, adoption of critical soil-test P values for pastures determined from the Better Fertiliser Decisions for Pastures (BFDP) meta-analysis of historical Australian trials has been poor because of perceived lack of relevance to the soils and contemporary pasture species in the region. Aims. We aimed to validate critical Colwell P values from the BFDP project for soils and contemporary pasture species of south-west Western Australia. Methods. Fifty P-rate response trials were performed with contemporary pasture species, and the results compared with BFDP. Key results. Trial results were consistent with BFDP and fell within 95% prediction intervals of response calibrations of Colwell P and relative yield pairs for different P buffering index (PBI) ranges. Soils with PBI 0.99), although critical values were slightly lower for lower soil PBI. Conclusions. Critical Colwell P values from BFDP are relevant and applicable to soils and contemporary pasture species of south-west Western Australia. Implications. Agronomic advice and application of P should be based on interpretation of Colwell P values, with P applied only when levels are below the critical value. Pasture composition should also be considered when interpreting Colwell P values. This approach minimises risks of P loss and improves economic outcomes for growers.
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Validation of critical soil-test phosphorus values from the Better Fertiliser Decisions for Pastures meta-analysis
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Autor/in / Beteiligte Person: | Weaver, David ; Rogers, David ; Dobbe, Eric ; Summers, Robert ; Master, Ronald ; McFerran, Robert ; Mussell, Graham ; Mercy, Justin ; Dawson, Luke ; Lynch, Kath |
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Zeitschrift: | https://doi.org/10.1071/CP23194, 2024 |
Veröffentlichung: | CSIRO Publishing, 2024 |
Medientyp: | academicJournal |
DOI: | 10.1071/CP23194 |
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