Using the expression "transformational crisis" invented by János Kornai and used for the whole national economy the paper intends to define the common characteristics of this transformational crisis evolved in the countries concerned. Besides the paper tries to define and interpret this expression in sector approach just as to further develop it in consideration of agriculture. The eastern enlargement of the EU is considered to be different from the former enlargements when it came to the accession of countries with comparatively consolidated agricultural structure and increasing agricultural output. In Hungary the very source of possible difficulties is to be seeked in the transformational depression. Due to the transformational depression the EU-adaptation led to difficulties in the short run and could lead to difficulties in the long run.