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Hydrothermal Emergence Model for Ripgut Brome (Bromus diandrus)

Published online by Cambridge University Press:  20 January 2017

Addy L. García,
Jordi Recasens,
Frank Forcella,
Joel Torra and
Aritz Royo-Esnal
Addy L. García*
Affiliation:
Dto Hortofruticultura, Botànica i Jardineria, ETSEA, Universitat de Lleida, Lleida, Spain
Jordi Recasens
Affiliation:
Dto Hortofruticultura, Botànica i Jardineria, ETSEA, Universitat de Lleida, Lleida, Spain
Frank Forcella
Affiliation:
USDA-ARS Lab, Morris, Minnesota, USA
Joel Torra
Affiliation:
Fundació Centre UdL-IRTA. Lleida. Spain
Aritz Royo-Esnal
Affiliation:
Dto Hortofruticultura, Botànica i Jardineria, ETSEA, Universitat de Lleida, Lleida, Spain
*
Corresponding author's Email: addylau@hbj.udl.cat
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Abstract

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A model that describes the emergence of ripgut brome was developed using atwo-season data set from a no-tilled field in northeastern Spain. Therelationship between cumulative emergence and hydrothermal time (HTT) wasdescribed by a sigmoid growth function (Chapman). HTT was calculated with aset of water potentials and temperatures, iteratively used, to determine thebase water potential and base temperature. Emergence of ripgut brome waswell described with a Chapman function. The newly-developed function wasvalidated with four sets of data, two of them belonging to a third season inthe same field and the other two coming from independent data from SouthernSpain. The model also successfully described the emergence in differentfield management and tillage systems. This model may be useful forpredicting ripgut brome emergence in winter cereal fields of semiaridMediterranean regions.

Keywords

Ripgut brome, Bromus diandrus RothChapman functiongreat bromehydrothermal timesowing delaytillage systems

Information

Type
Weed Management
Information
Weed Science , Volume 61 , Issue 1 , March 2013, pp. 146 - 153
Copyright
Copyright © Weed Science Society of America 

References

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