Comparison of variability of measurable (continuous) characteristics of selected grass species in DUS testing
Wiesław Pilarczyk
wieslaw.pilarczyk@up.poznan.plKatedra Metod Matematycznych i Statystycznych, Akademii Rolniczej w Poznaniu (Poland)
Irena Mucha
Centralny Ośrodek Badania Odmian Roślin Uprawnych, Słupia Wielka (Poland)
Abstract
Variability of measurable characteristics appearing in DUS (distinctness, uniformity and stability) trials on three species of grass was compared. The data have been derived from the assessments carried out on a number of varieties of Red fescue, Kentucky bluegrass and Perennial ryegrass species from 1998 to 2001. The characteristics concerned the stem, flag leaves and inflorescence of single plants. The variability was measured with the use of coefficient of variability. Nonparametric Friedman’s test was used for analysis of the differences. In general (independently of species), the characteristics concerning the stem were significantly less variable than those concerning the leaves. The characteristics concerning the inflorescence were of moderate variability. Significant differences caused by years were also noticed.
Keywords:
DUS testing, measured characteristics, nonparametric Friedman’s test, uniformity, variabilityReferences
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Authors
Wiesław Pilarczykwieslaw.pilarczyk@up.poznan.pl
Katedra Metod Matematycznych i Statystycznych, Akademii Rolniczej w Poznaniu Poland
Authors
Irena MuchaCentralny Ośrodek Badania Odmian Roślin Uprawnych, Słupia Wielka Poland
Statistics
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