Hydrothermal Emergence Model for Ripgut Brome (Bromus diandrus)

• Published in: Weed science 2013-01, Vol.61 (1), p.146-153
• Main Authors: García, Addy L., Recasens, Jordi, Forcella, Frank, Torra, Joel, Royo-Esnal, Aritz
• Format: Article
• Language: English
• Subjects: air temperature; Biological and medical sciences; Bromus diandrus; Chapman function; data collection; Emergence; Fundamental and applied biological sciences. Psychology; Germination; grains; great brome; Growing seasons; hydrothermal time; Mediterranean region; Modeling; no-tillage; Parasitic plants. Weeds; Phytopathology. Animal pests. Plant and forest protection; prediction; Rain; Seedling emergence; Seeds; semiarid zones; Soil temperature; Soil water; Soils; Sowing date; sowing delay; Spain; Temperature; Tillage; tillage systems; Water potential; Water temperature; WEED MANAGEMENT; Winter
• ISSN: 0043-1745; 1550-2759
• DOI: 10.1614/WS-D-12-00023.1

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