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The present investigation entitled “Effect of Azotobacter and PSB inoculation on nitrogen uptake by lettuce. (Lactuca sativa L.)” was carried out at Department of Plant Pathology, College of Agriculture, Pune in view to study their effect on growth parameters and nutrient uptake by 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 revealed that application of liquid bioinoculants significantly increase nitrogen uptake by lettuce crop over uninoculated control and ranged from 0.25 g to 0.62 g. Whereas seed treatment with liquid Azotobacter + Foliar spray of liquid Azotobacter was superior for soil Azotobacter population and available soil nitrogen and seed treatment with liquid PSB + foliar spray of liquid Azotobacter was superior for soil PSB population and available phosphorus, over uninoculated control. Considering all these parameters, it could be concluded that liquid Azotobacter and PSB improved soil biochemical properties which may ultimately influence the growth of lettuce.
Keywords: Azotobacter, PSB, Nutrient uptake, Soil biochemical properties