Productivity of herbages of different varieties of variegated alfalfa ( Medicago varia L. ) under inoculation with nodule bacteria (S inorhizobiummeliloti ) in the Republic of Karelia

The research was carried out in 2021-2024 in the conditions of the southern regions of Karelia. The soil of the experimental site is sod-podzolic, medium loamy, (pH — 5.8). The variability of weather conditions in the accounting years allowed to unlock the potential of the studied species. The purpose of the study is to evaluate the formed varietal-microbial systems based on the most adaptive varieties and cultivars of alfalfa to the conditions of the region, with medium-term hay use. The object of the study is variegated alfalfa varieties and cultivars of the breeding of the Federal Williams Research Center of Forage Production & Agroecology named after V. R. Williams Agnia VIC, Pastbischnaya 88, Taisiya, 506 (Lusya) and SGP-387 and a strain of nodule bacteria A-1, provided by the FSBSI All-Russian Research Institute of Agricultural Microbiology. It has been established that the most adapted to medium-term use for hay (mowing in the budding phase - the beginning of flowering) in the Republic of Karelia are the cultivar 506 (Lusya) and the Agnia VIC variety when inoculating seeds with a strain of nodule bacteria A-1.