Biometrical Letters Vol. 56(1), 2019, pp. 45-57
|
ON MODELING AND ANALYZING BARLEY MALT DATA IN DIFFERENT YEARS Iwona Mejza1, Katarzyna Ambroży-Deręgowska1, Jan Bocianowski1, Józef Błażewicz2, Marek Liszewski3, Kamila Nowosad4, Dariusz Zalewski4 1Department of Mathematical and Statistical Methods, Poznań University of Life Sciences, Wojska Polskiego 28, 60-637 Poznań, Poland, e-mails: iwona.mejza@up.poznan.pl; katarzyna.ambrozy@up.poznan.pl; jan.bocianowski@up.poznan.pl 2Department of Fermentation and Cereals Technology, Wrocław University of Environmental and Life Sciences, Chełmońskiego 37, 51-630 Wrocław, Poland, e-mail: jozef.blazewicz@upwr.edu.pl 3Institute of Agroecology and Plant Production, Wrocław University of Environmental and Life Sciences, Grunwaldzki 24A, 53-363 Wrocław, Poland, e-mail: marek.liszewski@upwr.edu.pl 4Department of Genetics, Plant Breeding and Seed Production, Wrocław University of Environmental and Life Sciences, Grunwaldzki 24A, 53-363 Wrocław, Poland, e-mails: kamila.nowosad@upwr.edu.pl; dariusz.zalewski@upwr.edu.pl |
The main purpose of this study was the model fitting of data deriving from a three-year experiment with barley malt. Two linear models were considered: a fixed linear model with fixed effects of years and other factors, and a mixed linear model with random effects of years and fixed effects of other factors. Two cultivars of brewing barley, Sebastian and Mauritia, six methods of nitrogen fertilization and four germination times were analyzed. Three quantitative traits were observed: practical extractivity of the malt, malting productivity, and a quality coefficient Q. The starting point for the statistical analyses was the available experimental material, which consisted of barley grain samples destined for malting. The analyses were performed over a series of years with respect to fixed or random effects of years. Due to the strong differentiation of the years of the study and some significant interactions of factors with years, annual analyses were also carried out.
complete randomized design, fixed linear model, mixed linear model, Tukey’s HSD test, brewing barley, extractivity, malt, malting productivity, quality coefficient
