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1 January 2013 Hydrothermal Emergence Model for Ripgut Brome (Bromus diandrus)
Addy L. García, Jordi Recasens, Frank Forcella, Joel Torra, Aritz Royo-Esnal
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A model that describes the emergence of ripgut brome was developed using a two-season data set from a no-tilled field in northeastern Spain. The relationship between cumulative emergence and hydrothermal time (HTT) was described by a sigmoid growth function (Chapman). HTT was calculated with a set of water potentials and temperatures, iteratively used, to determine the base water potential and base temperature. Emergence of ripgut brome was well described with a Chapman function. The newly-developed function was validated with four sets of data, two of them belonging to a third season in the same field and the other two coming from independent data from Southern Spain. The model also successfully described the emergence in different field management and tillage systems. This model may be useful for predicting ripgut brome emergence in winter cereal fields of semiarid Mediterranean regions.

Nomenclature: Ripgut brome, Bromus diandrus Roth

Weed Science Society of America
Addy L. García, Jordi Recasens, Frank Forcella, Joel Torra, and Aritz Royo-Esnal "Hydrothermal Emergence Model for Ripgut Brome (Bromus diandrus)," Weed Science 61(1), 146-153, (1 January 2013).
Received: 24 February 2012; Accepted: 17 May 2012; Published: 1 January 2013
Chapman function
great brome
Hydrothermal time
sowing delay
tillage systems
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