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Meta-analysis is a powerful tool to summarize variety mixture effects - exemplified by grain yield and weed suppression of spring barley

Kiær, Lars; Skovgaard, Ib and Østergård, Hanne (2006) Meta-analysis is a powerful tool to summarize variety mixture effects - exemplified by grain yield and weed suppression of spring barley. In: Østergård, H. and Fontaine, L. (Eds.) Cereal crop diversity: Implicatons for production and products, ITAB, Paris, France, pp. 49-52.

[thumbnail of 9380.pdf] PDF - English


In a new project, we aim to increase the general understanding of the power of meta-analysis to combine existing experimental results on variety mixtures. In this way, explanatory power can be increased compared to separate analyses and overall measures and relationships may be revealed. We will thus pursue to uncover a number of critical issues, including the relative importance of various traits and trait combinations on mixing success. To demonstrate the methods of meta-analysis applicable for variety mixture data, we considered a data set consisting of grain yield and weed ground cover assessments in 16 field trials of six 3-component variety mixtures and their components (part of the Danish BAR-OF field trials). The effects of mixing were analysed separately for each field trial and the results used in a meta-analysis in combination with their standard errors. We also analysed the mixing effects of each mixture by fitting a linear model to the entire data set. Both methods showed an overall positive mixing effect on grain yield and a trend for less weed to be found in variety mixtures. Finally, strengths and shortcomings of the methods are highlighted.

EPrint Type:Conference paper, poster, etc.
Type of presentation:Paper
Keywords:Meta-analysis, data analysis, spring barley, variety mixtures, cultivar mixtures, weed suppression, grain yield
Subjects: Environmental aspects
Crop husbandry > Crop health, quality, protection
Crop husbandry > Crop combinations and interactions
Crop husbandry > Weed management
Farming Systems
Research affiliation: Denmark > KU - University of Copenhagen > KU-LIFE - Faculty of Life Sciences
Denmark > DTU - Technical University of Denmark > DTU, RISØ - Risø National Laboratory
Denmark > SOAR - Research School for Organic Agriculture and Food Systems
Denmark > DARCOF III (2005-2010) > SEED - High quality organic seed
Deposited By: Kiær, Lars Pødenphant
ID Code:9380
Deposited On:05 Oct 2006
Last Modified:12 Apr 2010 07:34
Document Language:English
Refereed:Not peer-reviewed

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