Despite immense land resources, extensive farm machinery and agrochemical industries, and a large rural workforce, Soviet agriculture was relatively unproductive. Output was hampered in many areas by the climate and poor worker productivity. However, Soviet farm performance was not uniformly bad. Organized on a large scale and relatively highly mechanized, its state and collective agriculture made the Soviet Union one of the world's leading producers of cereals, although bad harvests (as in 1972 and 1975) necessitated imports and slowed the economy. The 1976–1980 five-year plan shifted resources to agriculture, and 1978 saw a record harvest. Conditions were best in the temperate chernozem (black earth) belt stretching from Ukraine through southern Russia into the east, spanning the extreme southern portions of Siberia. In addition to cereals, cotton, sugar beets, potatoes, and flax were also major crops. Such performance showed that underlying potential was not lacking, which was not surprising as the agriculture in the Russian Empire was traditionally amongst the highest producing in the world, although rural social conditions since the October Revolution were hardly improved. Grains were mostly produced by the sovkhozes and kolkhozes, but vegetables and herbs often came from private plots.