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A statistical study of similarities and dissimilarities in results between districts used in Swedish crop variety trials

Amiri, Saeid and Forkman, Johannes and von Rosen, Dietrich (2009). A statistical study of similarities and dissimilarities in results between districts used in Swedish crop variety trials. Technical Report. Uppsala: (NL, NJ) > Dept. of Energy and Technology
(NL, NJ) > Dept. of Crop Production Ecology, Sveriges lantbruksuniversitet. Report from the Department of Crop Production Ecology (VPE) ; 8
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Abstract

The annual results of Swedish crop variety trials are presented in reports and on the internet for Sweden divided into seven regions (production areas) A-G covering southern Sweden. The yield results for test varieties are usually presented as ratios relative to the yield of a control variety. These ratios are presented per region, with the implicit assumption that differences in ratios may exist between regions. In this report, the division of agricultural districts into regions was investigated through cluster analyses. Districts that produced similar levels of yield or similar ratios were clustered into groups of similar districts. Cluster analyses were performed on regions, districts and soil types for spring barley, winter wheat and oats, based on a large data set of results from variety trials performed during the period 1997-2006. The study revealed that some regions, districts and soil types produce similar levels of yield or similar yield ratios. However, clusters of regions, districts or soil types that produce similar levels of yield do not always produce similar yield ratios.

Authors/Creators:Amiri, Saeid and Forkman, Johannes and von Rosen, Dietrich
Title:A statistical study of similarities and dissimilarities in results between districts used in Swedish crop variety trials
Series/Journal:Report from the Department of Crop Production Ecology (VPE) (1653-5375)
Year of publishing :2009
Number:8
Number of Pages:45
Place of Publication:Uppsala
Publisher:Institutionen för växtproduktionsekologi, Sveriges lantbruksuniversitet
ISBN for printed version:978-91-86197-53-7
ISSN:1653-5375
Language:English
Publication Type:Report
Refereed:No
Full Text Status:Public
Subjects:Obsolete subject words > FORESTRY, AGRICULTURAL SCIENCES and LANDSCAPE PLANNING > Plant production > Agronomy
Keywords:variety trials, cluster analysis, regions
URN:NBN:urn:nbn:se:slu:epsilon-8-257
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-8-257
ID Code:4021
Department:(NL, NJ) > Dept. of Energy and Technology
(NL, NJ) > Dept. of Crop Production Ecology
Deposited By: Johannes Forkman
Deposited On:06 Oct 2009 00:00
Metadata Last Modified:02 Dec 2014 10:27

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