The British enforced Corn (Cereal grains) laws, 1794–1846, protected the British agricultural sector from imports of British North American wheat. The Reciprocity Treaty, 6 June 1854, developed a trade agreement between Canada and the United States which affected trade of wheat grown in Ontario. Northern Ontario is mainly tundra and forested area, whereas southern Ontario has lands suitable for livestock and general farming as well as geography suitable for pasture and dairying industries. Fruit farming can also be found in southern Ontario. Ontario is the largest producer of mixed grains, soybeans and shelled corn in the country. The province is also home to nearly all tobacco farms in Canada, the majority being situated in the Ontario tobacco belt. In the 2011 Canadian Census there were 137 tobacco farms located in Ontario, three in Quebec, and one on Prince Edward Island.