Mixed results on grain yield from deep-placement of P in southern Qld

David W. Lester1, Michael J. Bell2

1 Department of Agriculture and Fisheries Queensland, 13 Holberton St, Toowoomba, Qld, 4350, www.daf.qld.gov.au, david.lester@daf.qld.gov.au

2 Queensland Alliance for Agriculture and Food Innovation, University of Queensland, Gatton Campus, Gatton, QLD, 4343


Deep-placement (0.2 m) of phosphorus (P) for grain crops has produced a range of outcomes across 11 locations and 24 site years in southern Queensland.  Some locations have provided substantial increases in yield over several seasons, but others fail to respond. Both summer and winter cereals appear more consistent in responding to deep P than winter pulses. There were too few summer pulses to make any conclusions about their responsiveness.  Experiments used either triple superphosphate or mono-ammonium phosphate as a P source, with indications that fertiliser form may influence P response.


The Australian Society of Agronomy is the professional body for agronomists in Australia. It has approximately 500 active members drawn from government, universities, research organisations and the private sector.

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