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1 January 2008 Emergence Prediction of Common Groundsel (Senecio Vulgaris)
Milt McGiffen, Kurt Spokas, FRANK FORCELLA, David Archer, Steven Poppe, Rodrigo Figueroa
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Common groundsel is an important weed of strawberry and other horticultural crops. Few herbicides are registered for common groundsel control in such crops, and understanding and predicting the timing and extent of common groundsel emergence might facilitate its management. We developed simple emergence models on the basis of soil thermal time and soil hydrothermal time and validate them with the use of field-derived data from Minnesota and Ohio. Soil thermal time did not predict the timing and extent of seedling emergence as well as hydrothermal time. Soil hydrothermal time, adjusted for shading effects caused by straw mulch in strawberry, greatly improved the accuracy of seedling emergence predictions. Although common groundsel generally emerges from sites at or near the soil surface, the hydrothermal model better predicts emergence when using hydrothermal time at 5 cm rather than 0.005 cm, probably because of the volatility of soil temperature and water potential near the soil surface.

Nomenclature: Common groundsel, Senecio vulgaris L.; strawberry, Fragaria × ananassa Duchesne.

Milt McGiffen, Kurt Spokas, FRANK FORCELLA, David Archer, Steven Poppe, and Rodrigo Figueroa "Emergence Prediction of Common Groundsel (Senecio Vulgaris)," Weed Science 56(1), 58-65, (1 January 2008).
Received: 27 March 2007; Accepted: 1 August 2007; Published: 1 January 2008
base soil water potential
Base temperature
Weibull function
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