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The Critical Weed-Free Period in Carrot

Published online by Cambridge University Press:  20 January 2017

Clarence J. Swanton ,
John O'Sullivan  and
Darren E. Robinson
Clarence J. Swanton*
Affiliation:
Department of Plant Agriculture, University of Guelph, Guelph, ON N1G 2W1, Canada
John O'Sullivan
Affiliation:
Department of Plant Agriculture, University of Guelph, Guelph, ON N1G 2W1, Canada
Darren E. Robinson
Affiliation:
Department of Plant Agriculture, University of Guelph, Guelph, ON N1G 2W1, Canada
*
Corresponding author's E-mail: cswanton@uoguelph.ca
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Abstract

Seeding date and the duration of weed emergence influenced the duration of the critical weed-free period in carrot. The critical weed-free period extended up to 930 growing degree days (GDD), when carrot was seeded in late April. In contrast, the critical weed-free period was short and lasted 414 to 444 GDD, when seeded in mid to late May and weed biomass was less than 650 g m−2. It is important for growers to scout fields for weeds until 930 GDD to protect the yield potential of the carrot crop in earlier planted crops; however, for carrot planted in mid to late May, weeds emerging after 444 GDD did not reduce yield. A useful strategy to reduce reliance on herbicide application would be to delay planting until late in May.

Keywords

Carrot, Daucus carota LCritical period of weed controlcrop competitionintegrated weed management
Type
Weed Biology and Ecology
Information
Weed Science , Volume 58 , Issue 3 , September 2010 , pp. 229 - 233
Copyright
Copyright © Weed Science Society of America 

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References

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