Hi Karthi,
You have come at the right place. Our experienced members and webmaster will be definitely in a very good position to give you suggestions and feedback to improve your blog and get approval.
I would suggest you to go through the below Resources at Techulator. That will give you a complete idea about why Google rejected your application and what you can do to get approved.
http://www.techulator.com/resources/9412-Checklist-tips-get-your-AdSense-application-approved.aspx
http://www.techulator.com/experts/2647-How-to-get-Adsense-approval-fast.aspx
http://www.techulator.com/resources/9134-Websites-blogs-wait-6-months-before-applying-AdSense.aspx
Also read other related articles which are available at Techulator related to the subject.
Also incorporate suggestions provided by our experienced members in the above responses.
All the best for getting your blog approved by Adsense.
Regards,
Shravan
"Winners don't do different things, they just do things differently"