Effect of reduced herbicide rates on weed control, environmental impact and profitability of corn

dc.contributor.authorSoltani, N.
dc.contributor.authorVyn, R.J.
dc.contributor.authorVan Eerd, L.L.
dc.contributor.authorShropshire, C.
dc.contributor.authorSikkema, P.H.
dc.date.accessioned2013-09-17T14:43:55Z
dc.date.available2013-09-17T14:43:55Z
dc.date.issued2009en_US
dc.degree.departmentUniversity of Guelph Ridgetown Campusen
dc.description.abstractA study was conducted over a 3-yr period (2003, 2004, and 2005) to evaluate the effect of reduced herbicide rates 20, 40, 60, 80, and 100% of the manufacturer’s recommended rate (MRR) on weed biomass reduction, environmental impact (EI), yield, and profitability of corn (Zea mays L.) in Ontario. The herbicide rate required to provide 95% biomass reduction of velvetleaf (Abutilon theophrasti Medic.), redroot pigweed (Amaranthus retroflexus L.), common ragweed (Ambrosia artemisiifolia L.), common lambsquarters (Chenopodium album L.), and annual grasses was 92, 30, 41, 28, and 83% of the MRR for isoxaflutole plus atrazine, 200, 119, 23, 23, and 117% of the MRR for dimethenamid plus dicamba/atrazine, 141, 72, 46, 45, and 200% of the MRR for glufosinate plus atrazine, and 81, 29, 18, 24, and 88% of the MRR for nicosulfuron/rimsulfuron plus dicamba/diflufenzopyr, respectively. The herbicide rate required to provide 95% of weed-free corn yield was 61, 22, 130, and 11% of the MRR for isoxaflutole plus atrazine, imethenamid plus dicamba/atrazine, glufosinate plus atrazine, and nicosulfuron/ rimsulfuron plus dicamba/diflufenzopyr, respectively. Nicosulfuron/rimsulfuron plus dicamba/diflufenzopyr had the lowest EI. The results of profitability analysis suggested that the MRR rates do not tend to maximize profit margins. In most cases, there were no significant differences in profit margins for treatments with 40, 60, 80, and 100% of the MRR.en_US
dc.description.sponsorshipOntario Corn Producers Association; Agricultural Adaptation Councilen_US
dc.identifier.citationSoltani, N., Vyn, R. J. , Van Eerd, L. L. , Shropshire, C. , and Sikkema, P. H.. 2009. Effect of reduced herbicide rates on weed control, environmental impact and profitability of corn. Canadian Journal of Plant Science. 89(5): 969-975
dc.identifier.issn1918-1833
dc.identifier.urihttp://hdl.handle.net/10214/7551
dc.language.isoenen_US
dc.publisherCanadian Journal of Plant Scienceen_US
dc.rights.licenseAll items in the Atrium are protected by copyright with all rights reserved unless otherwise indicated.
dc.subjectAtrazineen_US
dc.subjectdicambaen_US
dc.subjectdiflufenzopyren_US
dc.subjectdimethenamiden_US
dc.subjectglufosinateen_US
dc.subjectnicosulfuronen_US
dc.subjectrimsulfuronen_US
dc.subjectZea mays L.en_US
dc.titleEffect of reduced herbicide rates on weed control, environmental impact and profitability of cornen_US
dc.typeArticleen

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