Putting legumes into grass dominant pasture and hay fields through renovation is certainly not a new idea in Kentucky. Renovation has been an important forage improvement practice for the past twenty years. What is relatively new is the power tillage technique of introducing legumes into grass dominant sods.
Smith, Edward M.; Fehr, Robert L.; Lacefield, Garry D.; and Evans, J. Kenneth, "Renovating Grass Fields with a Renovation Seeder" (1976). Agriculture and Natural Resources Publications. Paper 51.