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Incomplete split-plots in variety trials - based on a-designs

Kristensen, Dr. K. (2003) Incomplete split-plots in variety trials - based on a-designs. In: Biuletyn Oceny Odmian, 31, pp. 7-17.

[thumbnail of Alternatives_to_SplitPlot-Orgprints.pdf] PDF - English


Incomplete split-plots based on a-designs are proposed as alternative to traditional split-plot designs. The purpose of the incomplete split-plot designs is to increase the efficiency of the treatment (whole plot factor) comparisons especially for specific varieties. The designs are constructed in 4 different methods, but in all methods the unit for the treatments are the incomplete blocks (in stead of whole plots with all varieties in traditional split-plots). The designs are compared with each other and with traditional split-plot and randomised complete block designs using generated data with known covariance structure and using data from 5 uniformity trials. The comparisons showed that these designs in almost all cases were more efficient than the traditional designs and that they were never considerably less efficient that these. Designs where the incomplete blocks are grouped so that each group contain all treatments (one incomplete block with each treatment) were more efficient that when the incomplete blocks were randomised independently (in one step).

EPrint Type:Conference paper, poster, etc.
Type of presentation:Paper
Keywords:alpha-designs, uniformity trials, efficiency of designs, variety trials.
Subjects: Knowledge management > Research methodology and philosophy
Research affiliation: Denmark > DARCOF II (2000-2005) > VI.2 (BAR_OF) Characteristics of spring barley varieties for organic farming
Deposited By: Kristensen, Senior scientist Kristian
ID Code:1498
Deposited On:07 Oct 2003
Last Modified:12 Apr 2010 07:28
Document Language:English
Refereed:Not peer-reviewed

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