In 1945, agricultural production stood at only 40 percent of the 1940 level, even though the republic's territorial expansion had "increased the amount of arable land". In contrast to the remarkable growth in the industrial sector, agriculture continued in Ukraine, as in the rest of the Soviet Union, to function as the economy's Achilles heel. Despite the human toll of Collectivisation of agriculture in the Soviet Union, especially in Ukraine, Soviet planners still believed in the effectiveness of collective farming. The old system was reestablished; the numbers of collective farms in Ukraine increased from 28 thousand in 1940 to 33 thousand in 1949, comprising 45 million hectares; the numbers of state farms barely increased, standing at 935 in 1950, comprising 12.1 million hectares. By the end of the Fourth Five-Year Plan (in 1950) and the Fifth Five-Year Plan (in 1955), agricultural output still stood far lower than the 1940 level. The slow changes in agriculture can be explained by the low productivity in collective farms, and by bad weather-conditions, which the Soviet planning system could not effectively respond to. Grain for human consumption in the post-war years decreased, this in turn led to frequent and severe food shortages.