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In page Alfalfa:

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Alfalfa growers have a suite of varieties or cultivars to choose from in the seed marketplace, and base their selection on a number of factors, including the dormancy or activity rating, crown height, fitness for purpose (i.e., hay production or grazing), disease resistance, insect pest resistance, and forage yield.[citation needed] Plant breeding efforts use scientific methodology and technology to strive for new improved varieties.[citation needed]