Perennial ryegrass is one of the most valuable pasture grasses. The species is recommended for
sodding various types of land in Poland due to its fast growth and the ability to produce large
numbers of vegetative shoots. Seedling emergence and biomass yield are largely determined by seed
quality. This study analyzes the correlations between the basic physical properties of seeds of
perennial ryegrass cv. Maja and their germination capacity. The basic dimensions (length, width and
thickness) and mass of each of the 150 seeds were determined, and their arithmetic mean diameter,
geometric mean diameter, aspect ratio, sphericity index and density were calculated. The seeds were
germinated for 14 days, and the results were recorded daily, which enabled to determine germination
time for each seed. The relationships between the evaluated parameters were determined by the
Student’s t-test for independent samples and correlation analysis. The analyzed physical properties of
seeds had no significant effect on the germination rate index. Germinated and non-germinated seeds
differed significantly in width, length and arithmetic mean diameter, but they should not be sorted
based on their plumpness to improve the quality of seed material because it could lead to a high loss of
viable seeds.
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