The aim of the analysis was to estimate the necessary labour resources for the Polish agriculture till 1990 proceeding from the assumption of changes in ownership structure and land utiliization in the period between 1900 and 1990. In this connection it became neeeaaary to analyze the following probléme in the it became neeeaaary to analyze the following probléme in the article: - perspective changes in area of arable lands, - predicted agrarian structure in target year, - problem of supplying arable lands with professionally active population (density of employment), - variant estimate of indispensable labour resources according to ownership structure (including share of people employed in the agricultural service sector). The area of arable lands in the Polish agriculture in 1990 was estimated at ca. 18.5 million hectare. In one variant it is assumed that 36,4 percent of these lands will be used by the socialized agricultural sector. With such a structure of land use it can be expected that the average employment density in the whole Polish agriculture will amount to 18.8 person per 100 hectare of arable land. This implies a necessity of employing 4.146 thousand persons in the entire agricultural sector with 16 percent of this number employed in the agricultural service sector.