Mathematics & Physics 2015, 8(1), 64–74 УДК 519.78 System Dynamics Model for Conversion to Organic Farming Crtomir Rozman∗ ˇ Faculty of Agriculture and Life Sciences University of Maribor ce Miroljub Kljaji´ Andrej ˇ Kidriˇ Pivola, 10, SI−2311 Hoˇ Slovenia c † Skraba ‡ Cybernetics & Decision Support Systems Laboratory Faculty of Organizational Sciences University of Maribor ceva cesta, 55a, SI−4000 Kranj Slovenia Received 12.11.2014, received in revised form 10.12.2014, accepted 27.12.2014 In this paper model for organic farming development to support government decision making is presented. <...> After performing several simulation scenarios we discovered that conversion to organic farming relies on subsidies which provide the main motivation for conversion from conventional farming to organic farming. <...> However, the subsidies are not the only driving force in the system, even more important are activities that promote organic farming, since sufficiently large subsidies could not be provided in order to complete the conversion from conventional to organic farming to the extent desired. <...> Another important feature is food demand, determined by population size, which negatively influences the conversion to organic farming due to the increased demand leading to increased food prices. <...> Introduction Bontkes and Van Keulen [1] argue that the study of agricultural systems requires the use of non-linear dynamic models that allow the simulation of the system in a qualitative way, based on a description of the underlying processes. <...> Their approach is illustrated with a regional model that has been developed to simulate agricultural development in the Koutiala region in the southwestern part of Mali. <...> There are many factors, such as farm type and soil quality, which might influence farmers’ decisions. <...> All rights reserved c – 64 – Crtomir Rozman, Miroljub Kljaji´ ˇ c, Andrej ˇ Skraba System Dynamics Model for Conversion . has been tested with survey data, while the complete overview of modeling approaches in the area of organic farming is provided by [5]. <...> The detailed analysis of organic farming development scenarios is provided by Zanoli et al. [6] and Zanoli et al. [7]. <...> Besides econometric modeling and mathematical programming <...>