A field experiment was conducted to study the effect of foliar application of water soluble fertilizer on protein yield, dry matter production and grin yield of pigeonpea [Cajanus cajan (L.) Millsp.] during kharif 2012 at Zonal Agricultural Research Station, UAS, GKVK, Bengaluru. The experiment was conducted on sandy loam soil which was low in available nitrogen and medium in available phosphorus and potassium. The experiment consisted of five concentrations of water soluble fertilizer (WSF) i.e. no foliar spray (control), 0.25% WSF, 0.5% WSF, 0.75% WSF and 1.0% WSF and three stages of foliar application of WSF (peak flowering stage, pod development stage and both at peak flowering and pod development stages). Significantly higher grain yield (1661 kg/ha), protein yield (316.5 kg/ha) and total dry matter (156.1 g/plant) was recorded with foliar application of 1.0% WSF. Application of 1.0% WSF increased the grain yield to the extent of 17.66% compared to no foliar spray (control). But there was no significant difference between stages of spray and the interaction between concentration of water soluble fertilizer and stages. However higher protein yield (287.2 kg/ha), total dry matter production at harvest (134.3 g/plant) and grain yield (18.0 g/palnt) was recorded with foliar application WSF at both peak flowering and pod development stages.