In many cases if the post is interesting enough or raises issues to discuss you will get comments (as long as you have enough traffic to the blog to begin with).
You can also address the readers in your post and ask them to comment. Let them know that you're interested in what they think about what you wrote.
You can also use different social media channels to ask that people comment on your new blog post (e.g via facebook newsfeed, twitter and such).
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