Investigations carried out at Agricultural Research Station, Bijapur (Karnataka) on the influence of forage species and alley widths in an alley cropping system indicated that subabul (Leucaena Uucocephala) had better persistency over years and could yield more green forage matter compared to Sesbania and Pennisetum massaicum* Among the latter two species, Pennisetum massaicum showed better persistency but the total green forage yield over a period of four years was lower than sesbania. The annual and total forage yield of species was greatly influenced by alley widths. Closer alley width of 4.05 m gave the highest total forage yield compared to medium (8.10 m) and wider (12.15 m) alley widths in all the three species studied.