The Ministry of Agriculture and Fisheries Act 1919 abolished the Board of Agriculture and Fisheries and created the Ministry of Agriculture and Fisheries, which took on the powers of the Board and the remaining functions of the Food Production Department established during the war. In 1919 prices of farm produce had risen by 25% compared to prices at the end of the war. The Agriculture Act 1920 set out guaranteed prices for wheat and oats based on the 1919 averages, to be reviewed annually. However, in the early 1920s, prices fell drastically, the Act was repealed, guaranteed prices were replaced by lump sum payments and the Agricultural Wages Board abolished, as part of the Government's deflationary policies. By 1922 virtually all of war-time controls had gone. The area under cultivation in Britain fell from 12 million acres (49,000 km²) in 1918 to 9 million acres (36,000 km²) in 1926. Farm prices continued to decline and then fell by 34% in the three years after 1929.