Bill Bowden (West Midlands Group)
Criag Scanlan (DAFWA)
|Contributor||West Midlands Group|
To characterise the residual value of different P sources and changes in soil fertility (SOC, CEC, pH, nutrient supply, non-wetting, compaction) after 30 plus years, using soil measurements and bioassay cropping.
30 years after application, water soluble P leaches to depth on grey sands but is still effective for the growth of deep rooted blue lupins. On the one-hand, the citrate-soluble P in C-500 releases more slowly through time and so has a longer term residual effect than water soluble P. On the other hand, higher rates of C-500 are required than superphosphate to reach maximum yield when soil P levels are low. It is less likely to leach and so pollute ground waters. If cheap enough, C-500 could be used as a maintenance P fertiliser. Much work is still to be done on this trial site.
|Lead research organisation||
West Midlands Group
|Host research organisation||N/A|
|Trial funding source||NACC|
|Trial funding source||DAFWA|
Thanks go to the 1980 instigators of the trial: Mike Baker and, Mike Bolland to the landowners, David Frankland, Geoff Pearson, to the funders, NACC, and to the sponsors, the West Midlands Group and DAFWA.
|Other trial partners||DAFWA|
No crop specified
|Sow date||Not specified|
|Harvest date||Not specified|
|Plot size||60m x 3m|
|Plot replication||Not specified|
SILO weather estimates sourced from https://www.longpaddock.qld.gov.au/silo/
Jeffrey, S.J., Carter, J.O., Moodie, K.B. and Beswick, A.R. (2001). Using spatial interpolation to construct a comprehensive archive of Australian climate data , Environmental Modelling and Software, Vol 16/4, pp 309-330. DOI: 10.1016/S1364-8152(01)00008-1.