Historian J. A. Perkins argued that more important than Bismarck's new tariff on imported grain was the introduction of the sugar beet as a main crop. Farmers quickly abandoned traditional, inefficient practices in favor of modern methods, including the use of artificial fertilizers and mechanical tools. Intensive methodical farming of sugar and other root crops made Germany the most efficient agricultural producer in Europe by 1914. Even so, farms were usually small in size and women did much of the field work. An unintended consequence was the increased dependence on migratory, especially foreign, labor.