Effect of drought tolerant azotobacter and psb on growth and nutrient uptake of sorghum

A pot culture experiment was conducted to evaluate the effect of drought tolerant Azotobacter and PSB on growth and nutrient uptake of Sorghum (Sorghum bicolor Monech L.) Seed inoculation with isolates of Azotobacter and PSB in combination with 50 days dry spell showed significant increase in growth parameters viz., seed germination, height of plant, dry weight of earhead, dry weight of grain, dry weight of shoot and root, total dry matter of plant, nitrogen and phosphorous uptake per plant. The population of Azotobacter and PSB decreased after 70 days of sowing. Dry grain weight of sorghum significantly higher due to dual inoculation of Azotobacter + PSB at 50 days dry spell. Higher Azotobacter and PSB populations were observed at 50 days dry spell than 30 days dry spell, probably due to the prolonged availability of soil moisture. Inoculation with Azotobacter + PSB to sorghum increased uptake of nitrogen and phosphorous. content