The aim of this master thesis was to investigate whether climate change, site conditions and intensity of management have an impact on the nutrient supply of permanent grassland and thus on its performance. In particular, field data were collected on a total of 27 experimental sites in Austria over an observation period of 10 years in order to analyse whether climate, site conditions and management intensity have a measurable impact on yield, forage quality and nutrient cycling in permanent grassland. The main focus of the investigations was given to the nutrients N, P and K by which a nutrient accounting was performed. Comprehensive statistical analysis of the experimental data using SPSS showed that the performance of permanent grassland is driven by the choice of management measures, but also by weather conditions. Under dry weather conditions great regional differences were found in terms of grassland yield. Whereas in wet regions even an increase occurred, a strong yield decline was recorded in dry areas. On the contrary forage quality but also nutrient balances were less affected by dry weather conditions. Ensuring a sustainable and environmentally sound grassland management is thus a key to economic productivity. Therefore, it requires a balanced management by the interaction of utilisation frequency, fertilization intensity and management measures, which should be adapted to the site specific conditions. Hence, farmers could benefit by as sufficient yields and high forage quality can even be provided under changing climatic conditions.