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Journal article
Phosphorus buffering determines how soil properties and rainfall influence wheat (Triticum aestivum) yield response to phosphorus fertiliser
Crop and pasture science, Vol.75(12), 24295
2024
Abstract
Context Current decision support systems (DSS) for phosphorus (P) fertiliser were developed using data from historical cropping systems. An understanding of how soil properties and rainfall influence wheat (Triticum aestivum) response to P fertiliser in current systems is required to optimise P management. Aims The aims of this study were to: (1) assess the soil properties that have the greatest influence on relative yield; (2) examine how rainfall conditions influence relative yield; and (3) examine whether there were interactive effects between rainfall and soil properties on relative yield. Methods Forty P rate-response field experiments were completed in Western Australia. Regression tree modelling, soil test calibration curves and the sliding window approach were used to examine relationships between soil properties or rainfall and relative yield. Key results Phosphorus buffering index (PBI) was important for determining the factors that influence relative yield. For sites with PBI 0-10 cm <56 (n = 30), regression tree modelling showed rainfall before sowing and soil pHCa were important factors (R2 = 0.59). For sites where PBI >56 (n = 10), relative yield was closely related to plant-available P at 0-10 cm and the r-value for the calibration curve was 0.95. Conclusions Rainfall and soil pHCa influence wheat response to P where PBI <56 is attributed to an accumulation of soil P after decades of fertiliser applications and the availability of stored soil P to crops. Implications Pre-sowing rainfall should be included in DSS so that grain producers can make informed, tactical decisions about P fertiliser applications for wheat at sowing.
Details
- Title
- Phosphorus buffering determines how soil properties and rainfall influence wheat (Triticum aestivum) yield response to phosphorus fertiliser
- Authors/Creators
- Craig A. Scanlan - Murdoch University, Centre for Sustainable Farming SystemsRaj Malik - Dept Primary Ind & Reg Dev Western Australia, 10 Dore St, Katanning, WA 6317, AustraliaGustavo Boitt - Univ Western Australia, 35 Stirling Highway, Crawley 6009, AustraliaMark Gherardi - Summit Fertilisers, 29 Ocean St, Kwinana Beach, WA 6167, AustraliaJames Easton - CSBP, POB 345, Kwinana 6966, AustraliaZed Rengel - Univ Western Australia, 35 Stirling Highway, Crawley 6009, Australia
- Publication Details
- Crop and pasture science, Vol.75(12), 24295
- Publisher
- CSIRO Publishing
- Number of pages
- 12
- Grant note
- UMU1801-006RTX; UWA1801-002RTX / GRDC project 'Increasing profit from N, P and K fertiliser inputs into the evolving cropping sequences in the Western Region'
- Identifiers
- 991005741582007891
- Copyright
- © 2024 The Author(s) (or their employer(s)).
- Murdoch Affiliation
- SoilsWest
- Language
- English
- Resource Type
- Journal article
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- Collaboration types
- Domestic collaboration
- Citation topics
- 3 Agriculture, Environment & Ecology
- 3.45 Soil Science
- 3.45.473 Soil Phosphorus Dynamics
- Web Of Science research areas
- Agriculture, Multidisciplinary
- ESI research areas
- Agricultural Sciences