Seed yield was found significantly higher with early sowing (15th June) and in closer row spacings (30 cm) than other sowing dates and wider row spacings (45 and 60 cm) respectively. Phosphorus exerted a favourable effect on seed yield. Use of 75 kg ha−1 P2O5 showed significant increase in seed yield. The gross monetary returns, net monetary and benefit cost ratio were also significantly greater in early sowing date and closer row spacing. The value of benefit cost ratio increased with the increasing level of phosphate. The dose of 50 and 75 kg ha−1 P2O5 were found equally effective recording greater value of benefit cost ratio.