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Modeling germination and seedling elongation of common lambsquarters (Chenopodium album)

Published online by Cambridge University Press:  12 June 2017

Erivelton S. Roman ,
A. Gordon Thomas ,
Stephen D. Murphy  and
Clarence J. Swanton
Erivelton S. Roman
Affiliation:
Department of Plant Agriculture, University of Guelph, Guelph, ON, Canada N1G 2W1
A. Gordon Thomas
Affiliation:
Agriculture and Agri-Food Canada, Saskatoon Research Centre, Saskatoon, SK, Canada S7N 0X2
Stephen D. Murphy
Affiliation:
Department of Environmental and Resource Studies, University of Waterloo, Waterloo, ON, Canada N2L 3G1
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Extract

The ability to predict time of weed seedling emergence relative to the crop is an important component of a mechanistic model describing weed and crop competition. In this paper, we hypothesized that the process of germination could be described by the interaction of temperature and water potential and that the rate of seedling shoot and radicle elongation vary as a function of temperature. To test these hypotheses, incubator studies were conducted using seeds and seedlings of common lambsquarters. Probit analysis was used to account for variation in cardinal temperatures and base water potentials and to develop parameters for a new mathematical model that describes seed germination and shoot and radicle elongation in terms of hydrothermal time and temperature, respectively. This hydrothermal time model describes the phenology of seed germination using a single curve, generated from the relationship of temperature and water potential.

Keywords

Common lambsquarters, Chenopodium album L. CHEAL.Base temperature, base water potential, cardinal temperatures, Weibull function, hydrothermal time, ecophysiological models, integrated weed management, CHEAL.
Type
Weed Biology and Ecology
Information
Weed Science , Volume 47 , Issue 2 , April 1999 , pp. 149 - 155
Copyright
Copyright © 1999 by the Weed Science Society of America 

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