Spot spraying reduces herbicide concentrations in runoff

Melland, Alice R. and Silburn, D. Mark and McHugh, Allen D. and Fillols, Emilie and Rojas-Ponce, Samuel and Baillie, Craig and Lewis, Stephen (2016) Spot spraying reduces herbicide concentrations in runoff. Journal of Agricultural and Food Chemistry, 64 (20). pp. 4009-4020. ISSN 1936-0851

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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.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Files associated with this item cannot be displayed due to copyright restrictions.
Faculty / Department / School: Current - Institute for Agriculture and the Environment
Date Deposited: 06 Mar 2017 06:26
Last Modified: 05 Feb 2018 02:51
Uncontrolled Keywords: pesticide; water quality; sugar cane; precision spraying; postemergent; pre-emergent; sediment−water partition coefficient
Fields of Research : 07 Agricultural and Veterinary Sciences > 0799 Other Agricultural and Veterinary Sciences > 079901 Agricultural Hydrology (Drainage, Flooding, Irrigation, Quality, etc.)
07 Agricultural and Veterinary Sciences > 0799 Other Agricultural and Veterinary Sciences > 079902 Fertilisers and Agrochemicals (incl. Application)
Socio-Economic Objective: B Economic Development > 82 Plant Production and Plant Primary Products > 8203 Industrial Crops > 820304 Sugar
D Environment > 96 Environment > 9611 Physical and Chemical Conditions of Water > 961102 Physical and Chemical Conditions of Water in Coastal and Estuarine Environments
Identification Number or DOI: 10.1021/acs.jafc.5b03688
URI: http://eprints.usq.edu.au/id/eprint/30868

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