Dimitar MITEV, Galina NAYDENOVA
Abstract: The experiment with a polyhybrid population of Red fescue was performed in the period of 1995–2004.It was set annually during the winter from 1994/95, according to the block method with four repetitions.The seeds were collected consecutively in the period after 1992.They were sowed alone and in a mixture from two different, but consecutive years.The oldest seeds were excluded gradually from the scheme and were replaced by others, which had been obtained in the year before the sowing.The behaviors of the generations (dry substance yields, botanical ingredients) are varied.The genotype variance assessment shows that the differences in the productivity are due to a proven genotype influence, i.e. the different generations behave to one another as if they are different species. When the generations from two different sowings are compared the productivity differences, which are provoked by the genotype influence, are displayed in different years since the grasslands have been used. Considering the productivity, the highest yields were obtained from grasslands created by the combination of seeds gathered in 1993 and 1994, but which were sowed in 1995/1996 and 1996/1997. The investigated generations show a remarkable ability for self–cleaning from weeds.It is found that there are divergences in that tendency. There is a self–sowing of other meadow species which are characteristic for this region. It is assumed that there is a dependence among the formed genetic material and the admission to the environmental factors, durability, the spreading ability. Probably, the particular “structural units” (…, species, population, sort, …) have a specific “energy configuration”, which is subjected to the Nature rhythm and which represents a peculiar “projection” in Time with a corresponding direction of Evolution.
Key words: Red fescue, generations, rhythm, hypotheses