Mechanisation had reduced the need for labour. The boom of the late 19th and early 20th centuries, seemed to have come to an end by the mid-1920s. Production had expanded rapidly during the war and post-war years which created a large surplus.
Unsold stocks piled up and vast amount of grains became animal feed. Wheat prices fell and export market collapsed. This created the grounds for the Great Agrarian Depression of 1930s that ruined wheat farmers everywhere.
Thus, it can be concluded that the new technology introduced in agriculture in 19 th century created the grounds for the Great Agrarian Depression of 1930s.