Chris Korte1, Mick Brady1, Chris Davies1, Michael Moodie2, Sam Kleeman3
1Deparntment of Economic Development, Jobs, Transport & Resources (DEDJTR), 2Mallee Sustainable Farming (MSF), 3University of Adelaide
• On average for the three harvest dates there were 12 brome grass plants per m2, over 1000 brome grass seeds per m2 and 88 seeds per brome plant.
• The proportion of brome grass seed retained above the 15 cm harvest height was 59%, 38%, and 30% for the measurements on 7 November, 21 November and 5 December 2014 respectively.
• Harvesting the crop on these dates, combined with HWSC would potentially result in 41%, 62% and 70% of brome grass seed being added to the seed bank, and possibly more if seeds above 15 cm were dislodged in the harvesting operation.
• These measurements indicate insufficient brome grass seed is retained above harvest height, especially with later harvests, to expect control techniques such as seed carts and seed destructors to be effective on their own. However, when used as part of an integrated weed management program, these techniques will undoubtedly assist in achieving brome grass control.
• Research is continuing with MSF and the University of Adelaide to evaluate the effectiveness of a range of brome grass control approaches.