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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 ofthe critical weed-free period in carrot. The critical weed-free periodextended up to 930 growing degree days (GDD), when carrot was seeded in lateApril. In contrast, the critical weed-free period was short and lasted 414to 444 GDD, when seeded in mid to late May and weed biomass was less than650 g m−2. It is important for growers to scout fields for weedsuntil 930 GDD to protect the yield potential of the carrot crop in earlierplanted crops; however, for carrot planted in mid to late May, weedsemerging after 444 GDD did not reduce yield. A useful strategy to reducereliance on herbicide application would be to delay planting until late inMay.

Keywords

Carrot, Daucus carota LCritical period of weed controlcrop competitionintegrated weed management

Information

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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