The profitability of dairy farms is a broadly addressed issue in research, for different farming systems and even more so now, when it comes to the issue of sustainability in different agricultural fields. The present study presents an evaluation of the relations used for the determination of profitability of various categories of dairy farms, in terms of size, geographical area, and total milk production. In order to analyze the associated influence exerted on the level of profitability by the selected technical and economic indicators, regression functions were applied. The TableCurve program was used to determine the ideal equation that describes the data entered in a two- or three-dimensional representation. The research results showed that the size of farms and the level and value of milk production are directly correlated with profitability, and the unit cost is inversely correlated with it.

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Nitrogen is one of the most important nutrients for plants and is required by them in relatively large quantities. This paper presents an overview of scientific literature related to nitrogen management, with a specific highlight on permanent grasslands and has involved a bibliometric analysis of scientific literature regarding nitrogen management. The analysis was performed using the SCOPUS, which is an extensive database of literature all over the world, with wide coverage in keyword of analysis. For visualization and analysis, VOSviewer 1.6.18 was employed, which is an open access computer program, developed for creating bibliometric maps. The search results were downloaded as full record and citation data, with information related to document type, year of publication, title, author, keywords, abstract, references, funding agency, citations. A number of 3,948 articles were retrieved for analysis. The articles were sorted by relevance. The information was downloaded as .csv file and imported into VOSviewer 1.6.18 application software. Using the search query ”nitrogen management”, ”meadows” and ”pastures” indicated that 90% of the papers retrieved were research articles indexed in agricultural and biological sciences, followed by those in the environmental sciences, with themes of the ecosystem process, environmental management, land use, nitrogen fixation, organic nitrogen, soil structure, soil processing techniques.