A WEED SURVEY OF PEDIGREED ALFALFA SEED FIELDS IN MANITOBA

Autor:	I. N. Morrison, M. S. Goodwin, A. G. Thomas
Rok vydání:	1986
Předmět:	Perennial plant Crepis tectorum Plant Science Horticulture Biology biology.organism_classification Sonchus arvensis food.food food Agronomy Taraxacum officinale Seed contamination Avena fatua Weed Cirsium arvense Agronomy and Crop Science
Zdroj:	Canadian Journal of Plant Science. 66:413-416
ISSN:	1918-1833 0008-4220
Popis:	Weeds were counted in 77 pedigreed alfalfa (Medicago sativa L.) seed fields located throughout Manitoba. The five most abundant species were all perennials: quackgrass (Agropyron repens (L.) Beauv.), dandelion (Taraxacum officinale Weber), Canada thistle (Cirsium arvense (L.) Scop.), bluegrass (Poa spp.), and perennial sow-thistle (Sonchus arvensis L.). Quackgrass occurred in 65% of the fields with a mean field density of 23.4 culms m−2, the highest density of any of the species. The next four most abundant species were annuals with narrow-leaved hawk’s-beard (Crepis tectorum L.) having the highest mean field density for annual species at 2.9 plants m−2, although it occurred less frequently (30%) than the other three annuals, wild buckwheat (Polygonum convolvulus L.), wild mustard (Sinapsis arvensis L.) and wild oats (Avena fatua L.).Key words: Weed survey, alfalfa, quackgrass, narrow-leaved hawk’s-beard
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::59a46374e5c32336c4a273e19c152fe0 https://doi.org/10.4141/cjps86-057 Zobrazit plný text záznamu