Now there are some techniques here for you for your blogs or website.
1. Keep Commenting Easy For your Visitor
Make a easy way to comment your post in your site. So that the visitors can post easily and they will inspire to do this.
2. Instant Publish of Comment
Instantly publish the comments of your post. So that the user will see their comment in the site and the visitor inspire to comment in your site.
3. Response as soon as possible
If your visitor asked anythings to you by their comments, you try to feedback as soon as possible. As a result the visitor think that they are mostly prior from you and they will interested to be with you.
4. Make a line in your all the post like as- " Please leave a comment to get reply of your quest from me"