"At the end of World War I, the destructive effects of the war and the surrender burdens enforced on the Central Powers of Europe bankrupted much of Europe, closing major export markets in the United States and beginning a series of events that would lead to the development of agricultural price and income support policies. United States price and income support, known otherwise as agricultural subsidy, grew out of acute farm income and financial crises, which led to widespread political beliefs that the market system was not adequately rewarding farm people for their agricultural commodities.
"Beginning with the 1921 Packers and Stockyards Act and 1922 Capper-Volstead Act, which regulated livestock and protected farmer cooperatives against anti-trust suits, United States agricultural policy began to become more and more comprehensive. In reaction to falling grain prices and the widespread economic turmoil of the Dust Bowl and Great Depression, three bills led the United States into permanent price subsidies for farmers: the 1922 Grain Futures Act, the 1929 Agricultural Marketing Act, and finally the 1933 Agricultural Adjustment Act- the first comprehensive food policy legislation. Out of these bills grew a system of government-controller agricultural commodity prices and government supply control (farmers being paid to leave land unused). Supply control would continue to be used to decrease overproduction, leading to over 50,000,000 acres (200,000 km2) to be set aside during times of low commodity prices (1955-1973, 1984-1995), until the practice was eventually ended by the Federal Agriculture Improvement and Reform Act of 1996."
Note the dates where acreage was reduced. 1955-73 and 1984-1995. It was repealed under Clinton. Only one of the pieces of legislation came in during The New Deal, and it was purely a price support program directed at subsidizing the producers, not ploughing under crops or reducing acreage.
Rob
Sorry but I can't help remembering at least some of what I was taught.