Abstract:
At the A.R.D.S. Secuieni it was researched the evolution of different mixtures of perennial grasses and legumes with
mixed use, evidenced by their contribution to the structure of the vegetation, considering the percentage of participation
of the species in the seed norm and mode of use. The results obtained on the evolution of the structure of vegetation
cover at the mixtures with mixed use, was observed that was obtained five harvests, the first harvest being done in
hayfield regime, and the next four were harvested by grazing simulation, at an interval of 28 days. At the mixture b2,
composed of Dactylis glomerata 20% + Lolium perenne 70% + Lotus corniculatus 5% + Trifolium pratense 5%, in
2014, in the hayfield regime, in structure of vegetation cover the dominant percentage was in favor of the perennial
grasses, comprised between 57% in the fertilized variant with N40P40 and 67% at the N80P40 variant. On the other four
harvests, the perennial grasses tended to slightly decrease from one harvest to another except for the fertilized variant
with N80+40P40, where the participation of the grasses had a tendency to increase between 46-61%. In 2015, the
percentage of participation of the perennial grasses in the structure of the vegetal cover was maintained throughout the
five harvests. The highest percentages of legumes were in fertilized variants with N40P40 and N80P40, the values being
between 12-15%.
