Question: asking about use of bio fertilizer in brinjal. 
Answer: use azotobacter and phosphatika instead of urea and ssp. mix 4 kg of both with 100 kg of dry cow dung and keep it for overnight and then mixed it with soil, and also you can mix biopower in the soil 3 kg per bigha of land. along this also apply 1 tonne of dry cowdung per bigha of land.