Encourage Your Visitors: If you want your blog to be brimming with activity, then it's really important that you focus on getting your visitors to comment on your posts. There are people who can't really be bothered to comment or just don't know what the comments field is for. By directly conveying your message to your readers that you want them to comment, it will open up new doors. You need to understand that all it takes for some people to act is a little encouragement. Simply inform them that you would really appreciate some feedback and their opinions to help you write better articles in the future. It all comes down to how convincing you are in getting them to post comments on your blog regularly. Your blog might as well be dead if it has no comments on it, a fact that you need to understand before you try to convince people to comment. 

Social Media Can Help You Get Comments: When you attract the right type of traffic to your blog, you'll also get more of the kind of comments you want. Social media provides you with a simple way to bring visitors to your blog who are truly interested in your topic. Facebook, Twitter and other social sites give you the opportunity to send your fans/followers/friends to your blog posts instantly. Remember that everyone you connect with on a social network is someone who might become a regular contributor on your blog, so cultivate these connections. Tapping into social media for traffic to your blog is something every blogger should be doing these days, because it's an easy way to gain more targeted exposure by simply doing what you do anyway -post content and links.

Get Subscribers to Your Comments: You can install "Subscribe to Comments," which is a Wordpress plugin that encourages people to subscribe to comments on any post they choose. This feature can be very powerful, as it will encourage readers to keep returning to your site every time there's a new comment on the post they've subscribed to. In addition to this, when your readers subscribe to your comments, it makes it easier for them to reply to new comments later on when they get notified. 

It's best to think of increasing the number of comments you get as a long term goal, as it's something that usually happens gradually rather than all at once. The main factor is the kind of content you publish on your blog, as this is what really generates interest. Keep in mind, the more value your readers derive from your blog post, the higher will be the chance that they post a comment.