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As a first step in realization of IIASA&apos;S objectives in the modelings of centrally planned agricultural systems, the Hungarian Horticultural Model (HAM) as a prototype model for EMEA countries has been developed. First the general structure of the model and its mathematical description were completed. As a second stage of the HAM project, the first relatively aggregated version of the model (HAM-1) was elaborated and implemented in both IIASA and Hungarian computers. Now, after two years of work, the second and final, more disaggregated version of the model (HAM-2) has been constructed. In this paper, the general features and mathematical structure of HAM-2 are discussed including a short report on actual use and validation procedure.</abstract>
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