A field experiment entitled “Performance of cowpea [Vigna unguiculata (L.) Walp) under different levels of phosphorus and potassium in combination with biofertilizers” was conducted at crop research farm of Division of Agronomy, Faculty of Agriculture, Sher-e-Kashmir University of Agricultural Sciences and Technology of Kashmir, during kharif 2018. The soil of the experimental field was clay loam in texture, neutral in reaction (pH = 6.9), low in available nitrogen, low in available phosphorus, medium in available potassium and medium in organic carbon. The experiment was laid in RBD design having nine treatments and three replications. The observation revealed that grain yield (10.57 qha-1), straw yield (18.94 qha-1), yield attributes was high with the application of RDF (30N+60P2O5+30K2O) kg ha-1 + seed inoculation with PSB and KSB than other treatments. The RDF+ seed inoculation with PSB and KSB recorded 15.89% high grain yield than RDF (30N+60P2O5+30K2O) kg ha-1. B:C was also recorded more with application of RDF + seed inoculation with PSB and KSB (2.99) and was followed by RDF + seed inoculation with PSB (2.62) whereas lowest benefit cost ration was recorded with control treatment (2.24).

During the kharif season of 2018, a field experiment titled "Influence of phosphorus and potassium in combination with biofertilizers on growth of cowpea [Vigna unguiculata (L.) Walp]" was carried out at the crop research farm of the Division of Agronomy, Faculty of Agriculture, Sher-e-Kashmir University of Agricultural Sciences and Technology of Kashmir. The soil in the experimental field had the texture of clay loam, was neutral in reaction (pH 6.9), had low available nitrogen, low available phosphorus, medium available potassium, and medium organic carbon. The experiment was laid out in Randomized Block Design (RBD) design with nine treatments and three replications. The results of the experiment revealed that growth of the crop was significantly influenced by different treatments and Among various treatments, application of RDF (30 N, 60 P2O5, 30 K2O) kg ha-1+ seed inoculation with Phosphorus Solubilizing Bacteria (PSB) + Potassium Solubilizing Bacteria (KSB) significantly recorded maximum plant height (86.18 cm), leaf area index (3.62), dry matter production (16.20 q ha-1) and it also significantly increased the number of effective root nodules per plant of cowpea.