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The survey includes a number of conclusions about the behaviour of some meadow grasslands grown individually or in a mixture among them. They are situated over the slopes of the Central Balkan Mountain. There are differences both in their exposure towards the four cardinal points and diversity in soil gleying. The botanical composition of swards is rather variable. It is in a direct relation to the habitat of each of them. The sown meadow species of local origin predominated in established grasslands most of the time during the experiments. Self--sowing of other meadow species of local origin was found. It is considered that this behavior arises from the presence or lack of synchronization with the rhythm of Nature. It is supposed that each "structural unit" (grass combination) has a peculiar "projection in Time", the "level of energy saturation", which each of them has reached, has a direct relation to the formation process. It was concluded that each concrete variant represents a peculiar energy--information system of a different order, with the respective durability both in individual and evolutionary plan, with all the ensuing consequences. [ABSTRACT FROM AUTHOR]