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1 July 2010 The Critical Weed-Free Period in Carrot
Clarence J. Swanton, John O'Sullivan, Darren E. Robinson
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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.

Nomenclature: Carrot, Daucus carota L.

Clarence J. Swanton, John O'Sullivan, and Darren E. Robinson "The Critical Weed-Free Period in Carrot," Weed Science 58(3), 229-233, (1 July 2010).
Received: 16 June 2009; Accepted: 1 March 2010; Published: 1 July 2010
critical period of weed control
Crop competition
integrated weed management
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