Therese McBeath, Rick Llewellyn, Bill Davoren, Willie Shoobridge
CSIRO Agriculture and Food
- Just 50 kg DAP/ha knife point drilled with 70 kg/ha wheat seed is enough to reduce wheat plant establishment
- Wheat fertilised with DAP with seed yielded 0.5 t/ha (20%) less than wheat with DAP placed below seed in 2016.
- The addition of 35 kg urea/ha below the seed overcame the yield penalty in the DAP-with-seed plots, suggesting access to N was a driver.
Why was the trial done?
In 2015 we noticed that wheat plant establishment was significantly better on non-wetting sand (crest and dune) plots that received no fertiliser with the seed compared with those that received 50 kg DAP/ha. Similar effects were measured in trials established by Jack Desbiolles at Moorlands in 2015 (McBeath et al. 2016).
Figure 1. Effect of DAP applied with seed on wheat emergence at Karoonda across multiple soil types in 2015
How was the trial done?
In 2016 we established a more targeted plot trial on non-wetting sand at Karoonda to test the effect of DAP with wheat seed on establishment and to measure whether a difference in establishment was yield limiting.
We thank the Loller family for hosting the field site and input from Jeff Braun is gratefully acknowledged. This research is funded by GRDC and CSIRO Agriculture and Food in partnership with Mallee Sustainable Farming (MSF00003).