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Re-defined soil test–grain yield response relationships can give better fertiliser decisions for P, K and S with wheat, canola and lupin in the cropping systems of Western Australia

Anderson, G., Chen, W., Bell, R.W. and Brennan, R. (2012) Re-defined soil test–grain yield response relationships can give better fertiliser decisions for P, K and S with wheat, canola and lupin in the cropping systems of Western Australia. In: Joint SSA- NZSSS Soil Science Conference, Soil Solutions for Diverse Landscapes, 2 - 7 December, Hobart, Australia.

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Abstract

Soil test P, K and S – response relationships for wheat, lupin and canola can be used to make better fertiliser decisions for the cropping systems of Western Australia. A database of N, P, K and S experiments conducted in Western Australia was compiled. Relationships were then defined between soil test value and per cent maximum yield. Data sets were partitioned according to soil properties and sampling depths to improve the accuracy of the fitted regression equations. Sampling of the surface 0-10 cm soil layer provided suitable predictions of P relationships when separated into soil types with different P sorption capacities. In contrast, soil sampling to 30 cm depth improved the relationship for K soil tests for wheat and canola when the impact of soil acidity and potential yield on root distribution was taken into account. In contrast, deeper soil sampling to 30 cm improved the relationship for S for canola but not for wheat where rate of S leaching and potential yield appear to be important. The N soil test relationships for wheat and canola were not significant and critical levels could not be defined.

Publication Type: Conference Item
Murdoch Affiliation: School of Environmental Science
URI: http://researchrepository.murdoch.edu.au/id/eprint/19729
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