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Title: Determining the critical period for broadleaf weed control in high-yielding cotton using mungbean as a mimic weed
Contributor(s): Charles, Graham W  (author); Sindel, Brian M  (author)orcid ; Cowie, Annette L  (author); Knox, Oliver G G  (author)orcid 
Publication Date: 2020-10
Early Online Version: 2020-04-02
DOI: 10.1017/wet.2020.38
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Abstract: Research using the critical period for weed control (CPWC) has shown that high-yielding cotton crops are very sensitive to competition from grasses and large broadleaf weeds, but the CPWC has not been defined for smaller broadleaf weeds in Australian cotton. Field studies were conducted over five seasons from 2003 to 2015 to determine the CPWC for smaller broadleaf weeds, using mungbean as a mimic weed. Mungbean was planted at densities of 1, 3, 6, 15, 30, and 60 plants m−2 with or after cotton emergence and added and removed at approximately 0, 150, 300, 450, 600, 750, and 900 degree days of crop growth (GDD). Mungbean competed strongly with cotton, with season-long interference; 60 mungbean plants m−2 resulted in an 84% reduction in cotton yield. A dynamic CPWC function was developed for densities of 1 to 60 mungbean plants m−2 using extended Gompertz and exponential curves including weed density as a covariate. Using a 1% yield-loss threshold, the CPWC defined by these curves extended for the full growing season of the crop at all weed densities. The minimum yield loss from a single weed control input was 35% at the highest weed density of 60 mungbean plants m−2. The relationship for the critical time of weed removal was further improved by substituting weed biomass for weed density in the relationship.
Publication Type: Journal Article
Source of Publication: Weed Technology, 34(5), p. 689-698
Publisher: Cambridge University Press
Place of Publication: United Kingdom
ISSN: 1550-2740
Fields of Research (FoR) 2008: 070103 Agricultural Production Systems Simulation
Fields of Research (FoR) 2020: 300409 Crop and pasture protection (incl. pests, diseases and weeds)
300205 Agricultural production systems simulation
300207 Agricultural systems analysis and modelling
Socio-Economic Objective (SEO) 2008: 820301 Cotton
Socio-Economic Objective (SEO) 2020: 260602 Cotton
Peer Reviewed: Yes
HERDC Category Description: C1 Refereed Article in a Scholarly Journal
Appears in Collections:Journal Article
School of Environmental and Rural Science

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