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Sugar beet, (Beta vulgaris), one of the four cultivated forms of the plant Beta vulgaris of the amaranth family (Amaranthaceae), cultivated as a source of sugar. Sugar beet juice contains high levels of sucrose and is second only to sugarcane as the major source of the world’s sugar. For information on the processing of beet sugar and the history of its use, see sugar. The sugar beet was grown as a garden vegetable and for...