On suitable soils, alfalfa produces the highest yield of nutrients possible from a perennial forage crop. However, high production costs and restrictive soil requirements have limited the production of alfalfa in Kentucky. High producing dairy cows respond well to premium quality forage, so alfalfa is a preferred forage crop in dairy production. Thus, alfalfa production is primarily contingent on the producer’s method of marketing the crop.
Hancock, Dennis and Collins, Michael, "Trends in Alfalfa Production and the Beef and Dairy Industries in Kentucky During 1989-98" (2000). Agronomy Notes. 5.