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https://hdl.handle.net/1959.11/20862
Title: | Extractable phosphorus (Colwell) concentrations of soil after banding fertiliser with seed in relation to the critical phosphorus requirement of a wheat crop | Contributor(s): | Culvenor, Richard (author); Simpson, Richard (author); Stefanski, Adam (author); McDonald, Scott (author); Fettell, Neil (author); Rattey, Allan (author); Richardson, Alan (author) | Publication Date: | 2012 | Open Access: | Yes | Handle Link: | https://hdl.handle.net/1959.11/20862 | Open Access Link: | https://www.agronomyaustraliaproceedings.org/images/sampledata/2012/8303_4_culvenor.pdf | Abstract: | The phosphorus (P)-balance efficiency of wheat crops in southern Australia is typically about 50% (i.e. about 2 units of P are applied in fertiliser to produce 1 unit of P in grain). We investigated the concentrations of Colwell extractable P in the surface soil (0-10 cm) of a red kandosol (pHCaCl2 4.42) within the planting row of a wheat crop sown on 31 May 2011 at Condobolin, NSW. Triple superphosphate had been banded at 0, 4, 8 or 20 kg P/ha with the wheat seed which was sown at 4.5 cm depth. The aim was to quantify the temporal mismatch between P availability in the band and the critical P requirement (Colwell P concentration corresponding to 95% of maximum growth rate) of the crop. The critical Colwell P concentration of topsoil in the crop row was initially low, but increased during tillering and was ~54 mg P/kg during grain filling. To achieve this concentration of Colwell P after anthesis it was necessary to apply ~15.3 kg P/ha at sowing. It was estimated that this would initially generate a Colwell P concentration of 80-90 mg P/kg and it was concluded that the Colwell P concentration of topsoil in the crop row (i.e. soil associated with the fertiliser band) would remain above the critical requirement of the crop for the first 126 days (~70%) of the crop's growth period. | Publication Type: | Conference Publication | Conference Details: | AAC 2012: 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, p. 1-4 | Publisher: | Australian Society of Agronomy Inc | Place of Publication: | Armidale, Australia | Fields of Research (FoR) 2008: | 070306 Crop and Pasture Nutrition | Fields of Research (FoR) 2020: | 300407 Crop and pasture nutrition | Socio-Economic Objective (SEO) 2008: | 820507 Wheat | Socio-Economic Objective (SEO) 2020: | 260312 Wheat | Peer Reviewed: | Yes | HERDC Category Description: | E1 Refereed Scholarly Conference Publication | Publisher/associated links: | http://www.agronomyaustraliaproceedings.org/images/sampledata/2012/8303_4_culvenor.pdf https://www.agronomyaustraliaproceedings.org/index.php/hydrogen/10-2012/321-2012-nutrition-to-edit |
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Appears in Collections: | Conference Publication |
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