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Selection of a Barley Yield Model Using Information–Theoretic Criteria

Published online by Cambridge University Press:  20 January 2017

Marie Jasieniuk ,
Mark L. Taper ,
Nicole C. Wagner ,
Robert N. Stougaard ,
Monica Brelsford  and
Bruce D. Maxwell
Marie Jasieniuk*
Affiliation:
Department of Plant Sciences, Mail Stop 4, University of California, Davis, CA 95616-8780
Mark L. Taper
Affiliation:
Department of Ecology, Montana State University, Bozeman, MT 59717-3460
Nicole C. Wagner
Affiliation:
USDA Foreign Agricultural Service, 1400 Independence Ave. SW, Washington, DC 20250
Robert N. Stougaard
Affiliation:
Montana State University, Northwestern Agricultural Research Center, Kalispell, MT 59901
Monica Brelsford
Affiliation:
Department of Land Resources and Environmental Sciences, Montana State University, Bozeman, MT 59717-3120
Bruce D. Maxwell
Affiliation:
Department of Land Resources and Environmental Sciences, Montana State University, Bozeman, MT 59717-3120
*
Corresponding author's E-mail: mjasien@ucdavis.edu
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Abstract

Empirical models of crop–weed competition are integral components of bioeconomic models, which depend on predictions of the impact of weeds on crop yields to make cost-effective weed management recommendations. Selection of the best empirical model for a specific crop–weed system is not straightforward, however. We used information–theoretic criteria to identify the model that best describes barley yield based on data from barley–wild oat competition experiments conducted at three locations in Montana over 2 yr. Each experiment consisted of a complete addition series arranged as a randomized complete block design with three replications. Barley was planted at 0, 0.5, 1, and 2 times the locally recommended seeding rate. Wild oat was planted at target infestation densities of 0, 10, 40, 160, and 400 plants m−2. Twenty-five candidate yield models were used to describe the data from each location and year using maximum likelihood estimation. Based on Akaike's Information Criterion (AIC), a second-order small-sample version of AIC (AICc), and the Bayesian Information Criterion (BIC), most data sets supported yield models with crop density (Dc), weed density (Dw), and the relative time of emergence of the two species (T) as variables, indicating that all variables affected barley yield in most locations. AIC, AICc, and BIC selected identical best models for all but one data set. In contrast, the Information Complexity criterion, ICOMP, generally selected simpler best models with fewer parameters. For data pooled over years and locations, AIC, AICc, and BIC strongly supported a single best model with variables Dc, Dw, T, and a functional form specifying both intraspecific and interspecific competition. ICOMP selected a simpler model with Dc and Dw only, and a functional form specifying interspecific, but no intraspecific, competition. The information–theoretic approach offers a rigorous, objective method for choosing crop yield and yield loss equations for bioeconomic models.

Keywords

Wild oat, Avena fatua L. AVEFAbarley, Hordeum vulgare L.Crop–weed competitionbioeconomic modelsmodel selectioninformation criteriaAICAICcBICICOMPwild oatbarleyyieldyield lossrelative time of emergence
Type
Special Topics
Information
Weed Science , Volume 56 , Issue 4 , August 2008 , pp. 628 - 636
Copyright
Copyright © Weed Science Society of America 

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