Vol: 39 Page: 91

Authors:
Agnieszka Kubik-Komar
Izabela Kuna-Broniowska

Title:
 Application of variance analysis for split-plot with repeated measures design in estimation of Apera spica venti changes under impact of tillage systems and herbicides doses

Language: English

Keywords:
contrast analysis
herbicide doses
relative abundance
repeated measures design
split-plot design
tillage systems

Summary:
In this paper the analysis of variance for fixed split-plot with repeated measures model is presented. The method based on univariate and multivariate analysis of orthonormal contrast, making calculations independent of the covariance matrix structure, was chosen. In this way the impact of tillage systems as well as doses of herbicides on relative abundance (Ra) Apera spica venti evaluated three times a year was estimated. Average values of studied feature differed significantly under experimental factors, time of weeds evaluation and, in addition, doses of herbicides and time interaction. The time trends analysis revealed the significant differences of mean Ra in every three time and significant changes of linear trends between herbicide subplots.

Display