The effect of mineral and organic fertilisation on the nodulation capacity at leguminous species in permanent grasslands

The research was conducted on two types of permanent grasslands located at different altitudes (330 and 1800 m) in the Romanian Carpathians. On the pasture located at an altitude of 330 m an experiment was undergone with mineral fertilization, with the subsequent doses of nitrogen N-0, N-50, N-100 and N-200. On the grasslands at an altitude of 1800 m, surveys were conducted at the Centre for Research in Blana-Bucegi Mountains, belonging to the Institute of Grassland Research and Development in Brasov. In this centre the organic fertilization was studied through sheepfolding the Nardus stricta with the following variants: non sheepfolded control, 2 nights of sheepfolding, 4 nights of sheepfolding and 6 nights of sheepfolding. After sheepfolding, an overseeding was performed with a mixture of cereal crops and legumes. Studies focused on highlighting the nodulation capacity in legume species existing in the grassland by determining the number and weight of nodules and the evolution of the floristic composition.