Research on the influence of fertilization on the structure of vegetation cover in temporary meadows with mixed use under the center of Moldova condition

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%.