The experiment was carried out at the farm of Uttar Banga Krishi Viswavidyalaya, Pundibari, Cooch Behar, West Bengal from August to October of 2011-12 and 2012-13, respectively. To investigate the effect of phosphorus enriched vermicompost on yield of groundnut under irrigated conditions. The experiment was laid out in a RBD design with 14 treatments which replicated thrice . Highest pod yield was obtained from T7, that receiving 150% phosphorus through rock phosphate enriched vermicompost grade-I) (2400.50 kg ha-1) whereas, the treatment receiving 100% recommended dose through sole application of chemical fertiliser (T1) (1479.00 kg ha-1) was lowest yield. Phosphorus uptake varied significantly with treatments It was observed that the uptake increased consistently with crop age up to 120 days after sowing. Pooled data revealed that T7 (258.6 kg ha-1) performed better in all sampling days. The lowest uptake was observed in T1 (100% phosphorus through SSP) (153.26 kg ha-1). With the advancement of crop growth better release of phosphorus was observed in rock phosphate enriched vermicompost and the value of available phosphorus were significantly higher than 100% RD plots. The treatment T7 recorded the highest value (53.05) of availability of P. The highest value of return-cost ratio (2.68) was observed corresponding to T5, i.e., 100% phosphorus through rock phosphate enriched vermicompost grade-I and this was followed by T4, i.e., combination of grade-I rock phosphate enriched vermicompost and chemical fertilizer @ 75% and 25% respectively (2.65) and they were far economical than sole application of chemical fertiliser.