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Residual weed populations in Saskatchewan – 1976 to 2003

dc.contributor.authorThomas, A.G.
dc.contributor.authorLeeson, J.Y.
dc.contributor.authorBrenzil, C.A.
dc.date.accessioned2018-08-29T19:41:17Z
dc.date.available2018-08-29T19:41:17Z
dc.date.issued2004-02-19
dc.description.abstractThe comparison of the relative abundance of weeds in Saskatchewan in 2003 with results from previous provincial surveys enables the identification of recent shifts in species ranks, life form density and relative abundance. In 2003, 2046 fields of spring wheat, barley, durum, oat, canary seed, canola, flax, mustard, lentil and pea were surveyed. These fields were selected using a stratified random sampling procedure based on ecodistricts. In each field, weeds were counted in 20 quadrats (50 by 50 cm) in late summer. Weed data are summarized using a relative abundance index based on frequency, field uniformity and density. Green foxtail was the most abundant weed, wild oats ranked second, wild buckwheat third and Canada thistle fourth. The results from the 2003 survey are compared to results from surveys of 1178 fields in 1995, 1149 fields in 1986 and 4423 fields in 1976-1979. Twelve species have been ranked amongst the top 20 most abundant species in each survey. Seven species, ranked in the top 20 species in the 1970’s and/or 1986, have since declined: rose, prostrate pigweed, night-flowering catchfly, cow cockle, bluebur, pale smartweed, flixweed. Six species have appeared in the top 20 list for the first time in 1995 and/or 2003: cleavers, barnyard grass, wheat, dandelion, quack grass, canola. Relative abundance of annual grass and perennials has increased, while relative abundance of annual broad-leaved species and facultative winter annuals has decreased. Densities of all life forms have decreased since the 1970’s.en_US
dc.description.versionNon-Peer Reviewed
dc.identifier.urihttp://hdl.handle.net/10388/9640
dc.language.isoenen_US
dc.relation.ispartofSoils and Crops Workshop
dc.rightsAttribution-NonCommercial-NoDerivs 2.5 Canada*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/2.5/ca/*
dc.subjectweed surveyen_US
dc.subjectweed densityen_US
dc.subjectweed life formen_US
dc.subjectweed rankingen_US
dc.subjectweed relative abundanceen_US
dc.titleResidual weed populations in Saskatchewan – 1976 to 2003en_US
dc.typePoster Presentationen_US

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