A field experiment was conducted to study the effect of NPK levels in combination with Rhizobium and PSB culture on growth and yield of green gram (Vigna radiata L. Wilczek) grown in the Subabul (Leucaena leucocephala) based agroforestry system during summer (Zaid) season of 2015 at Research farm of the Department of Agroforestry, School of Forestry and Environment, SHIATS Allahabad, UP, India. The soil of experimental field was sandy loam having medium to poor drainage, low in available nitrogen, medium in available phosphorus and fairly rich in available potassium with 7.5 pH. Nine treatment combination consisting of on variety viz., HUM-16, Four level of inorganic fertilizer and including control (F1: 20-20-10, F2: 30-30-15, F3:40-40-20, F4: 50-50-25) and seed inoculation with Rhizobium (MOR-1) and Phosphate Solubilizing Bacteria (PSB) were evaluated in Randomized Block Design. The result revealed that during summer season greengram cultivar of cv. HUM-16 performed best fertilized with T7 (30-30-15 kg NPK/ha) by dual seed inoculation of Rhizobium and PSB culture. This treatment combination was found more productive and economical, which was closely followed by the treatment combination of T4 (40-40-20 kg NPK/ha).