Direct comparison of runoff of residual and knockdown herbicides in sugarcane using a rainfall simulator finds large difference in runoff losses and toxicity relative to diuron

Article


Silburn, D. Mark, Fillols, Emilie, Rojas-Ponce, Samuel, Lewis, Steve and McHugh, A.D.. 2023. "Direct comparison of runoff of residual and knockdown herbicides in sugarcane using a rainfall simulator finds large difference in runoff losses and toxicity relative to diuron." Science of the Total Environment. 863. https://doi.org/10.1016/j.scitotenv.2022.160976
Article Title

Direct comparison of runoff of residual and knockdown herbicides in sugarcane using a rainfall simulator finds large difference in runoff losses and toxicity relative to diuron

ERA Journal ID3551
Article CategoryArticle
AuthorsSilburn, D. Mark, Fillols, Emilie, Rojas-Ponce, Samuel, Lewis, Steve and McHugh, A.D.
Journal TitleScience of the Total Environment
Journal Citation863
Number of Pages10
Year2023
PublisherElsevier
Place of PublicationNetherlands
ISSN0048-9697
1879-1026
Digital Object Identifier (DOI)https://doi.org/10.1016/j.scitotenv.2022.160976
Web Address (URL)https://www.sciencedirect.com/science/article/abs/pii/S0048969722080792
AbstractRunoff losses of herbicides have rarely been compared simultaneously under the same conditions. Our aim was to directly compare herbicide runoff losses, normalised for the amount present (relative runoff loads) and in absolute terms. Toxicity and runoff concentrations were combined to provide a risk ranking relative to diuron. Four rainfall simulation trials were conducted in sugarcane in the Great Barrier Reef catchment. Herbicides studied were older PSII residuals (atrazine, ametryn, diuron, hexazinone), alternative residuals (isoxaflutole, imazapic, metribuzin, metolachlor, pendimethalin) and knockdown herbicides (glyphosate, 2,4-D, fluroxypyr) and the tracer bromide (Br). Simulations were conducted two days after spraying, before differences due to half-lives were apparent. Two trials had bare soil and two had sugarcane trash. Herbicide runoff losses and concentrations were closely related to the amount applied, runoff amounts and partitioning coefficients. Relative runoff losses and absolute losses were similar for most older and alternative residual herbicides, 2,4-D and Br. Glyphosate and pendimethalin relative runoff losses were low, due to greater sorption. Isoxaflutole, imazapic, and fluroxypyr are applied at much lower rates and runoff losses were low. Herbicides were lost in the dissolved phase, except pendimethalin. There was a large range in toxicity relative to diuron. There is a range of herbicide choices posing less offsite risk than diuron and ametryn, which have high application rates and high toxicity. Herbicide choice should consider application rate, runoff losses, sorption, and toxicity. © 2022
KeywordsGreat barrier reef; Herbicide runoff; Partitioning coefficients; Toxicity; Pesticide selection
ANZSRC Field of Research 20203099. Other agricultural, veterinary and food sciences
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Byline AffiliationsCentre for Agricultural Engineering
Department of Environment and Science, Queensland
Sugar Research Australia, Australia
James Cook University
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