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The Critical Weed-Free Period in Carrot

  • Clarence J. Swanton (a1), John O'Sullivan (a1) and Darren E. Robinson (a1)
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.

Copyright
COPYRIGHT: © Weed Science Society of America 
Corresponding author
Corresponding author's E-mail: cswanton@uoguelph.ca
References
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