Publication Date
1989
Description
Phosphorus (P) deficiency is common in the extensive grazing country of northern Australia. Fertilizer recommendations for establishment and long term stability of improved pastures are imprecise because there is little understanding of the residual effects of P fertilizer in soil. Soil tests to monitor the fate of P fertilizer on cattle properties are of little value owing to variability, insufficient precision and the difficulty in sampling large pasture areas. Mathematical approaches to the problem are warranted in order to simplify fertilizer recommendation. Models to predict fertilizer P requirement have been developed for pastures (Bowden and Bennett, 1974; Probert and Williams, 1985) based on an estimate of residual value, but there has been no attempt to validate the models across a wide range of soils and pastures. In this paper a model is described to monitor the effects of fertilizer P in a wide range of light textured soils in northern Australia.
Citation
Gilbert, M, "Improving the Efficiency of Phosphorus Fertilizer use in Northern Australia" (2025). IGC Proceedings (1989-2023). 43.
https://uknowledge.uky.edu/igc/1989/session1/43
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Improving the Efficiency of Phosphorus Fertilizer use in Northern Australia
Phosphorus (P) deficiency is common in the extensive grazing country of northern Australia. Fertilizer recommendations for establishment and long term stability of improved pastures are imprecise because there is little understanding of the residual effects of P fertilizer in soil. Soil tests to monitor the fate of P fertilizer on cattle properties are of little value owing to variability, insufficient precision and the difficulty in sampling large pasture areas. Mathematical approaches to the problem are warranted in order to simplify fertilizer recommendation. Models to predict fertilizer P requirement have been developed for pastures (Bowden and Bennett, 1974; Probert and Williams, 1985) based on an estimate of residual value, but there has been no attempt to validate the models across a wide range of soils and pastures. In this paper a model is described to monitor the effects of fertilizer P in a wide range of light textured soils in northern Australia.
