Abstract
In 2009 the Queensland Government introduced a suite of environmental regulations aimed at reducing the amount of herbicides, fertilizers and sediment entering the Great Barrier Reef Lagoon. Staff from the Queensland Government were conducting spray-drift management workshops throughout the Wet Tropics region of far-northern Queensland when growers attending the workshops asked if it was possible to design a spray system for existing Irvin-type booms that could apply glyphosate to the interrow of sugarcane using air-induction nozzles, eliminating the need for shields or hoods. They thought that this would assist them to comply with the new regulations, as well as generally reduce use of residual herbicides. Early design and static testing commenced in October 2010 with various combinations of spray nozzles and spray bar angles tested. Prototype engineering drawings were also completed. No evidence of glyphosate toxicity to sugarcane was detected in replicated trials using the ‘Dual Herbicide Sprayer’ (DHS) in the 2012-2013 growing season. Yield data were not significantly different between plots where glyphosate was applied in the interrow and the standard grower practice of a mixture of diuron and paraquat applied over the entire paddock. Other indicators of phytotoxicity used in the trials, including stalks per metre of row, Brix, CCS, stalk diameter and height, showed no significant differences among treatments. A user manual for the DHS has been developed and is available free-of-charge to equipment manufacturers and growers. Based on sales of spray bars and new sprayers, approximately 11,000 ha are now being sprayed using DHS technology. © 2019 Australian Society of Sugar Cane Technologists. All rights reserved.
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Claims 5
Claim · model-written summary
No glyphosate toxicity to sugarcane was detected in replicated trials with the Dual Herbicide Sprayer.
Not reportedComparatorDirection
Verbatim
e0“No evidence of glyphosate toxicity to sugarcane was detected in replicated trials”
Claim · model-written summary
Sugarcane yield did not differ significantly between interrow glyphosate plots and the standard diuron plus paraquat practice.
Verbatim
t0“sugarcane”
e0“Yield data were not significantly different between plots where glyphosate was applied in the interrow and the standard grower practice of a mixture of diuron and paraquat applied over the entire paddock”
Claim · model-written summary
Stalks per metre of row, Brix and CCS showed no significant differences among treatments.
Not reportedTreatmentComparator
Verbatim
t0“sugarcane”
e0“Other indicators of phytotoxicity used in the trials, including stalks per metre of row, Brix, CCS, stalk diameter and height, showed no significant differences among treatments”
Claim · model-written summary
Stalk diameter and height showed no significant differences among treatments.
Not reportedTreatmentComparator
Verbatim
t0“sugarcane”
e0“Other indicators of phytotoxicity used in the trials, including stalks per metre of row, Brix, CCS, stalk diameter and height, showed no significant differences among treatments”
Claim · model-written summary
Approximately 11,000 ha are now sprayed using the Dual Herbicide Sprayer technology.
Verbatim
e0“approximately 11,000 ha are now being sprayed using DHS technology”
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1 in the opposite direction
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Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.