This research analyzed the degree of utilization of the agricultural biomass for energy purposes (combustion), in order to indicate the reasons that limit its use. The biomass potential was studied by means of the methodology of the biomass potential, whereas the factors suggesting a low degree of biomass utilization were identified by means of factor analysis. The research results reveal that there is an enormous potential of the unused agricultural biomass. This dissertation research significantly contributes to the establishment of a genuine mathematical model based on multiple linear regression. The solution obtained by this analysis, in both a mathematical and a scientific manner, conveys the primary reasons for an insufficient utilization of the biomass for energy purposes. Moreover, the paper suggests the measures to be applied for a more substantial use of this renewable source of energy and presents the expected benefits to be gained.

The Deliblato Sands Special Nature Reserve (SNR) is located in the Autonomous Province of Vojvodina (Northern Serbia). The favorable position implies the proximity to large cities with which it has good traffic connections. Romania, Hungary, Bulgaria, Croatia, and other countries from the region represent a dispersive zone. The topic of this paper is the function that the SNR has in sustainable tourism development. The objective of this work is the analytical research of the available written data, as well as those obtained after the conducted survey. The basis of the research is to find out how and to what extent the SNR contributes to sustainable tourism development. The research was carried out by measuring the value of sustainable tourism indicators, and examining the attitudes of residents, visitors, and students about the current state of sustainable tourism and the importance of the SNR for future tourism development. Respondents were selected using a random sample method. The authors used qualitative and quantitative methodologies in the paper. This research examined the SNR sustainable development by measuring sustainability indicators and surveying 1884 respondents (714 residents, 620 visitors, and 550 students) about sustainable tourism in the SNR. The obtained data were analyzed and presented with the help of SPSS v. 21 software. The research results can be used to create national and international strategies for sustainable tourism development.

To achieve the highest possible agricultural production, it is necessary to procure the appropriate agricultural machinery. A tractor is the most useful machine in agriculture that performs various functions. Therefore, the selection of a tractor is one of the key decisions in the agriculture-production process. This study aims to evaluate heavy tractors for agricultural production in Bosnia and Herzegovina. Since this is a selection between different tractors, which are evaluated using several criteria, the methods of multi-criteria analysis (MCDA) were used in this study. Five different methods were used to determine the weight of the criteria, of which a modified standard-deviation method is a new method used in practice, while the tractor ranking was performed using the CRADIS (compromise ranking of alternatives from distance to ideal solution) method. The results showed that the best-ranked tractor is A4, while the most deviations from the ranking occur when the entropy method is used. The contribution of this study is in the systematization of the methods for the objective determination of the criteria weights and the development of new methods to facilitate decision-making in agriculture and other industries.

The sustainable development of tourism in protected areas and the planning of its development is extremely important for mountain regions. The local population and tourists have a very important role in this process. Therefore, surveys of the local population and visitor satisfaction represent the basis of this research. The Vršac Mountains Outstanding Natural Landscape (ONL) could represent a significant destination for sustainable tourism. This mountainous area is characterized by a favorable geographical position, a diversity of natural and social factors, rare flora and fauna, and the rich ethno-social heritage of the local population. It is in a very favorable geographical position, and the proximity of the big cities Serbia and Romania, as well as many other factors, are important for tourism development in this area. A quantitative methodology was used for the purposes of this paper during our research. The purpose of this research was to investigate the influence of tourism development on the satisfaction of residents and visitors of the ONL by applying a survey technique, with the help of a questionnaire as a research instrument. A total of 1419 respondents were surveyed (789 residents and 630 visitors). The research results show that the ecological and socio-cultural dimensions of sustainability have the greatest importance for the respondents, and that these two dimensions of sustainability have the greatest impact on sustainable tourism in this protected area. Our main research hypothesis, which states that sustainable tourism has a positive impact on the satisfaction of residents and visitors, is fully confirmed. These data could be significant for tourism planning and the management of protected areas.

In the northern part of Serbia, where the Autonomous Province (AP) of Vojvodina is located, a total of 27 important plant areas (IPAs) have been established. Within three selected IPAs, there are different biocenoses inhabited by endemic plant and animal species, which form a unique sensitive ecosystem. Furthermore, in these areas, there are wetlands and areas important for geodiversity maintenance. The three studied IPAs include the territory of special nature reserves of the same name: the Special Nature Reserve (SNR) Zasavica, the SNR Obedska Bara, and the SNR Koviljsko-Petrovaradinski Rit. In these selected protected areas, tourist activities are carried out at different levels of development and through various forms of tourism. This research used quantitative methodology to examine the degree of sustainable tourism development and its impact on residents. A total of 1134 respondents were surveyed using a questionnaire as an instrument. The obtained results indicate that the selected IPAs can be destinations for sustainable tourism development. Ecological and sociocultural dimensions of sustainability contribute to this type of tourism to the greatest extent. Analyzing the data related to the impact of sustainable tourism on the respondents’ satisfaction, we concluded that they feel a certain satisfaction with sustainable tourism in all three investigated protected areas. The survey results called attention to the possibility of developing nature-based forms of tourism, in which the residents’ role in tourism planning and development should be strengthened. All forms of tourism that are developed here should have the primary goal of protecting nature in these IPAs.