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Doev Dzambolat Nikolaevich – senior lecturer of production technology, storage and recycling of plants products dpt. Gorsk state agrarian university. Vladikavkaz.
Tsotsieva Viktoria Pavlovna – post-graduate student of agroecology and plant protection dpt. Gorsk state agrarian university. Vladikavkaz.
Basieva Larisa Gurapovna – candidate of agricultural sciences, professor assistant of farming and land use dpt. Gorsk state agrarian university. Vladikavkaz.

In terms of vertical zoning of "alpine" nodule bacteria adapted to the harsh environmental conditions of habitat, it can show their competitive quality in a more favorable "plain" conditions. In the course of the research revealed the most competitive strain of nodule bacteria in conditions of vertical zoning of the Republic of North Ossetia-Alania. The maximum activity of the symbiotic system distinguished options using strains of nodule bacteria from the heights of 1600 and 2000 meters above sea level. Highly competitive, "alpine" strains of rhizobia allowed alfalfa form symbiotic apparatus greatest size, and the size of nitrogen fixation reach 500 kg / ha and more that 1.5 times exceeded the figures control variant using local indigenous races of nodule bacteria. Rhizobia strains, symbiotic showed the greatest activity, satisfy more than 75% of the needs of plants in nitrogen. In an embodiment, strain 1600, the figure has exceeded 78%, while in the embodiment, strain 2000 share of atmospheric nitrogen in plant nutrition was 79.4%.

Key words: biological nitrogen fixation, nodule bacteria, alfalfa, vertical zoning.