A field experiment was conducted during summer 2012, entitled with â€œPerformance of cowpea (Vigna unguiculata) genotypes with different levels of phosphorusâ€ under irrigated condition at the farmerâ€™s field (Mattihal Village of Basavan Bagewadi Taluk) in vertisols of Bijapur district. The experiment consists of twelve treatments including four cowpea genotypes (KBC-2, KM-5, IT-38956-1 and C-152) and three phosphrous levels (25, 50 and 75 P205 kg ha-1) in different combinations. Experiment laid out in factorial RCBD design with three replications. The results indicated that seed yield (1397 kg ha-1) and harvest index (0.51) higher with genotype IT-38956-1 owing to higher number of pods per plant (16.78), number of seeds per pod (13.89), seed yield per plant (12.74g) and 100 seed weight (12.92 g) as compared to other genotypes. Application of 50 kg P2O5 ha-1 recorded significantly higher seed yield (1087 kg ha-1) compared to 25 and 75 kg P2O5 ha-1, this might be due to higher yield contributing characters.