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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: [email protected]
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Abstract

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.

Keywords

Ripgut brome, Bromus diandrus RothChapman functiongreat bromehydrothermal timesowing delaytillage systems
Type
Weed Management
Information
Weed Science , Volume 61 , Issue 1 , March 2013 , pp. 146 - 153
Copyright
Copyright © Weed Science Society of America 

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