Keywords:  festulolium, alfalfa, binary grass stands, grass mixture, seeding rate, uniformity index

// Мелиорация.– 2020. – №2(92) – P 48–57

The analysis of the influence of the seeding rate on the yield of above-ground biomass in the design of binary grass stands based on Festulolium (Festulolium loliaceum (Hudson) P. V. Fournier))and alfalfa (Medicago sativa). According to the results of research (2017‒2018), the optimal seeding rate should be considered 3 million germinating Festulolium seeds + 6 million germinating alfalfa seeds, which ensures maximum productivity and share of alfalfa in the herbage up to 63.3 %. As a mathematical tool for evaluating the uniformity of feed  intake during the growing season, it is proposed to use the uniformity Index (I), which expresses the ratio of minimum and maximum increases of the aboveground biomass on average over a certain period (I = min/max).