To compare two soil phosphorus (P) tests (Diffusive Gradient Thin Films (DGT) and Colwell P) for their prediction of crop responses to applied-P in farmer paddocks.
Key messages
Starter application of P was important in maximising yields at GS30.
Grain yield responses (< 90 percent relative yield) to P were obtained for 35 percent of the paddocks surveyed.
DGT accurately predicted wheat responses to P accounting for 64 percent and 79 percent of the variation in early dry matter and grain respectively.
Colwell P could only explain 36 percent of the variation in early dry matter and no significant relationship could be obtained with grain.
Colwell P plus the Phosphorus Buffering Index (PBI) correctly predicted wheat response in 60 percent of the sites.
Trial source data and summary not available Check the trial
report PDF for trial results.
Climate
Derived climate information
No observed climate data available for this trial. Derived climate data is
determined from trial site location and national weather sources.
Birchip VIC
Boolite VIC
Charlton VIC
Curyo VIC
Hopetoun VIC
Jil JIl VIC
Kinnabulla VIC
Kooloonong VIC
Nullawil VIC
Rupanyup VIC
St Arnaud VIC
Warracknabeal VIC
Birchip VIC
CAUTION: Trial site locality unknown; Climate data sourced from Birchip Cropping Group office location
Boolite VIC
Charlton VIC
Curyo VIC
NOTE: Exact trial site locality unknown - Climate data may not be accurate
Hopetoun VIC
NOTE: Exact trial site locality unknown - Climate data may not be accurate
Jil JIl VIC
NOTE: Exact trial site locality unknown - Climate data may not be accurate
Kinnabulla VIC
Kooloonong VIC
NOTE: Exact trial site locality unknown - Climate data may not be accurate
Nullawil VIC
Rupanyup VIC
St Arnaud VIC
Warracknabeal VIC
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.
