Spot spraying reduces herbicide concentrations in runoff

Melland, Alice R., Silburn, D. Mark, McHugh, Allen D., Fillols, Emilie, Rojas-Ponce, Samuel, Baillie, Craig, and Lewis, Stephen (2016) Spot spraying reduces herbicide concentrations in runoff. Journal of Agricultural and Food Chemistry, 60 (20). pp. 4009-4020.

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Abstract

Rainfall simulator trials were conducted on sugar cane paddocks across dry-tropical and subtropical Queensland, Australia, to examine the potential for spot spraying to reduce herbicide losses in runoff. Recommended rates of the herbicides glyphosate, 2,4-D, fluoroxypyr, atrazine, and diuron were sprayed onto 0, 20, 40, 50, 70, or 100% of the area of runoff plots. Simulated rainfall was applied 2 days after spraying to induce runoff at one plant cane and three ratoon crop sites. Over 50% of all herbicides were transported in the dissolved phase of runoff, regardless of the herbicide’s sediment–water partition coefficient. For most sites and herbicides, runoff herbicide concentrations decreased with decreasing spray coverage and with decreasing herbicide load in the soil and cane residues. Importantly, sites with higher infiltration prior to runoff and lower total runoff had lower runoff herbicide concentrations.

Item ID: 43398
Item Type: Article (Refereed Research - C1)
Keywords: pesticide, water quality, sugar cane, precision spraying, postemergent, pre-emergent, sediment−water partition coefficien
ISSN: 1520-5118
Funders: Paddock to Reef Integrated Monitoring, Modeling and Reporting Program (PRIMMRP), Reef Rescue Research and Development (RRRD), Reef Water Quality Research and Development Science Program (RWQRDSP), Sugar Research Australia (SRA), Bob Packett (BP)
Projects and Grants: RRRD037, RRRD038, RWQRDSP RP56C, SRA Project NCA011
Date Deposited: 20 Mar 2016 23:47
FoR Codes: 05 ENVIRONMENTAL SCIENCES > 0502 Environmental Science and Management > 050205 Environmental Management @ 50%
07 AGRICULTURAL AND VETERINARY SCIENCES > 0701 Agriculture, Land and Farm Management > 070108 Sustainable Agricultural Development @ 50%
SEO Codes: 96 ENVIRONMENT > 9605 Ecosystem Assessment and Management > 960503 Ecosystem Assessment and Management of Coastal and Estuarine Environments @ 50%
96 ENVIRONMENT > 9609 Land and Water Management > 960904 Farmland, Arable Cropland and Permanent Cropland Land Management @ 50%
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