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The experimental display included a bifactorial experience, with different proportions of Trifolium resupinatum and Lolium multiflorum-based associations and different Nitrogen fertilization doses (N0, N100). The studies, performed during a 3-year period, made evident the dry matter yield, the total Nitrogen amount and the amount of transferred Nitrogen. According to association’s floristic composition, the amount of N transferred from legume species, on the whole, was between 48 and 145 kg/ha, in the variants without fertilization, and between 36 and 99 kg/ha, in the variants fertilized with N100.