EN
Forest grasses are poorly known with respect to their chemical composition. This remark also refers to plant dyes. Chlorophyll plays a vital part, primarily, in physiological processes, whereas carotenes, especially beta-carotene – in determining plant fodder value. Our own investigations undertook these issues with regard to 13 species of forest grasses. In the light of the obtained research results, it can be said that the occurrence of the above-mentioned dyes is a characteristic trait of individual species. Levels of dye concentrations depend on the dynamics of plant growth and development as well as site conditions, especially moisture levels. Moreover, considerable changes in chlorophyll content occurred during the vegetation season which can affect plant vitality and fodder value as well as landscape.