<I>/ABSTRACT: The structure of agrarian property, upon which the activities characteristic of the prime sector of the Economy are based and developed, constitutes a fundamental question for the understanding of the rural world and, also, in order to program efficiently agrarian policy to be carried out in any territory. This doctoral dissertation refers to the study of the structure of the agrarian property, in particular the southern region of Catalonia: The Ebro region (made up by four regions of strong agrarian tradition: Baix Ebre, Montsià, Terra Alta and Ribera d'Ebre). Among other topics investigated, the following are emphasized: the analysis of climatic conditions, the distribution of agrarian property, the statistical analysis and the problem of measuring lands; a methodological proposition is made in order to estimate the value of production in the primary sector and another for a program of structural improvements, finalizing with an economic analysis of the agrarian enterprise. Several annexes complete the statistical and methodological information of the different topics treated in the central body of the thesis. Throughout the development and treatment of each topic in particular, the conclusions arrived at are exposed and discussed, grouping all of them (at the end of the work) in a chapter with the final conclusions complemented with the corresponding statistical data, the possible projections of this work in the implementation of new lines of investigation, as well as the pertinent bibliographic and documentary references. The methodology used, definitively, result easily applicable in the study of any territory susceptible to this type of analysis.</i> Advisors/Committee Members: [email protected] (authoremail), true (authoremailshow), Artís Ortuño, Manuel (director).