Agroecological assessment and production potential of meadow stands at different ways of grassing of slope lands of the right-bank Forest-Steppe
Purpose. To assess the relationship between distribution, microrelief structure and regenerative dynamics of meadow phytocenoses on slope lands and to establish the productive potential of renewable herbage with different methods of their grassing in the conditions of the right-bank Forest-Steppe. Methods. Field and laboratory research in grassland, hypothesis, dialectical, synthesis and analysis, induction, statistical. Results. A strategy was theoretically developed for restoring the forage grasslands on slopes, which provides for the selection of the most adapted species with high biological characteristics, their ecological and phytocenotic combination in highly productive mixtures, and development of ecologically safe technologies for the reconstruction of such lands on the basis of theoretical provisions on the demutational dynamics of herbal phytocenoses. The species of legumes and cereal grasses were selected for the research, which, according to their biological characteristics, are valuable fodder, medicinal, melliferous, soil-protective and phytomeliorative crops. It was found that in terms of phytocenotic properties, 40% of the species of the Poaceae family exhibit dominant properties, 40% are among the main cenose-formers, 20% are dominants in narrowly limited ecological conditions. It was revealed that the ecological structure of populations of natural phytocenoses of slopes most often consists of one dominant species and two subdominants, which are in certain proportions. Direction of the ecological strategy for the development of each species has been established and a ranked series has been constructed according to the indicators of the cenotic activity index. Renewable legume agrophytocenoses have the greatest potential for productivity with superficial or radical improvement, which in the seasons of use in 2019-20 provided the yield of green mass at the level of 27.03-47.33 t/ha and dry matter – 6.31-10.32 t/ha. Conclusions. When selecting the species composition of renewable perennial phytocenoses, it is necessary to use ecological-biological and phytocenotic approaches, according to which the species should be evaluated according to their adaptability to growing conditions, coenotic power, competitive ability, association and productivity. The best ecological resistance to growing conditions and the value of the production potential was shown by restorative grass stands based on leguminous grasses of the raised type of development.
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