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The present investigation entitled “Effect of liquid formulation of Azotobacter and PSB inoculation on growth and yield of lettuce (Lactuca sativa L.)” was carried out at Department of Plant Pathology, College of Agriculture, Pune in view to study the population dynamics of Azotobacter and PSB at periodic interval, their effect on growth parameters and yield of lettuce crop. There were seven treatments, including seed treatment with liquid Azotobacter and liquid PSB @ 25 ml/kg of seed; Foliar spray of liquid Azotobacter and PSB @ 25ml/lit, in alone and in combination; respectively. Results indicates that seed treatment with liquid Azotobacter + foliar spray of liquid Azotobacter, was found superior amongst all the treatments conducted in respect of number of leaves (13.33), length of leaves (19.60 cm), breadth of leaves (8.70 cm), height of plant (84.23 cm), leaf area index (73.33 cm²), fresh weight 72 (24.06 g) and dry weight (7.42 g) of leaves, total dry matter weight (14.34 g), yield (24.06 g) over uninoculated control. Considering all these parameters, it could be concluded that liquid Azotobacter and PSB improve growth which may ultimately influence the yield of lettuce.

Key words: Azotobacter, PSB (Phosphate solubilizing bacteria), Growth parameters.