T1 = control, T2= farmyard manure (25 t/ha) + biofertilizer, T3= chicken manure (7.5 t/ha) + biofertilizer, T4= vermicompost (10 t/ha) + biofertilizer, T5= farmyard manure (10 t/ha) + chicken manure (2.5 t/ha) + vermicompost (2.5 t/ha) + biofertilizer, T6= recommended N150 P75 K75 through inorganic fertilizers and FYM (10 t/ha) Cost price of seed, fertilizers and manures (`/kg); Potato seed = 14.00; N = 10.78; P2O5 = 23.37; K2O = 7.36; Farmyard manure = 0.40; Chicken manure = 5.00 and Vermicompost = 3.00; Sale price of potato (`/ kg) = 8.00