Grădinari (Caraş Severin County) grasslands are representing about 33 % from the total agricultural land of the locality being important natural resource from this point of view, they being the topic of this research. Some of the grassland surfaces are coming from the abandoned agricultural land. One of the most important maintenance works needed in grasslands is represented by fertilisation. Every type of grasslands has different fertilisation needs, so the importance of this research is to set the optimal fertilisation rate with for different types of fertilising (chemical, organic and mixed). The purpose of this work is to find the optimal fertiliser rate for the grassland from Grădinari. The experimental plots were set in Grădinari (Caraş-Severin County), in 2004. The experimental plots comprise three fertilisation experiences: organic, chemical and mixed. Every fertilisation experience is organized in ten variants and five replicates. These were set after the blocks method. The surface of one plot is 20 m 2 (4m x 5m). The data were collected during 2004-2007 period. Thus, there was measured the total yield of fresh fodder and hay for every fertilisation variant from the abandoned arable land grassland and from the permanent grassland. After the analysis of the production results obtained can be noticed that the fertilisation of an abandoned agricultural land that is in succession to the grassland vegetation, the effect of the fertilisers is most powerful from the point of view of the yield starting with the second year from the fertiliser application. In comparison with the abandoned agricultural land in succession, the permanent grassland is visibly influenced by fertilisation starting with the first year from the fertiliser application.

grassland; fertilisation; permanent grassland; abandoned agricultural land

Presentation: oral