Why this leaf Color is changing?

Hi Ganesh . It seems to be like Magnesium Deficiency . Click on green link for checking symptoms and taking control measures from Plantix library. Also need to apply good amount of Farm Yard manure or Vermicompost along with recommended dosage of fertilizers of your area. Or you can also use fertilizer calculater available here on home page of Plantix to increase your crop productivity. Apart, you can also use and create a "Cultivation Tips" for Brinjal in Plantix. It provides you information on how to optimize your crop production.