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Title: Assessing break crop options for enhanced soil phosphorus availability
Contributor(s): Doolette, Ashlea (author); McNeill, Ann (author); Armstrong, Roger (author); Marschner, Petra (author); Tang, Caixian (author); Guppy, Christopher (author)orcid 
Publication Date: 2012
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Abstract: Any reduction in the need for fertiliser application through strategies that mobilise P from the 'soil P bank', enabling uptake by crops will provide a substantial economic benefit for the grower. Whilst many controlled environment studies report that certain break crop species have the capacity to mobilise P from less labile pools, there is scarce information suggesting mobilisation occurs in the field. This paper reports measurements of available P (Colwell and DGT) for root zone soils under break crops and wheat from five field locations in southern Australia, covering a range of climates and soil types differing in P sorption capacity. The aim was to identify potential for P mobilisation by break crops. Results demonstrate the enormous variability in plant-available P in the root-zone of different break crops across sites, as well as a clear influence of soil type on this soil P pool. More differences were detected between crops for DGT P than Colwell P. Across all sites, available P in the root zone soil of peas was consistently greater than other break crops, but not cereals. At one site, there was more available P in the root zone soil under lupins than the other break crops. However, it is concluded that the P mobilisation potential for any break crop cannot be assessed solely from available P measures in the root zone and a P budget for each crop is required.
Publication Type: Conference Publication
Conference Name: 16th Australian Agronomy Conference, Armidale, Australia, 14th - 18th October, 2012
Source of Publication: Capturing Opportunities and Overcoming Obstacles in Australian Agronomy: Proceedings of 16th Australian Agronomy Conference (Nutrition)
Publisher: The Regional Institute Ltd
Place of Publication: online
Field of Research (FOR): 070306 Crop and Pasture Nutrition
070302 Agronomy
Peer Reviewed: Yes
HERDC Category Description: E1 Refereed Scholarly Conference Publication
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School of Environmental and Rural Science

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