Most effective way of distributing keywords on a Wordpress blog.
 

I do a keyword research for a particular niche and I get a list of keywords. I assign the main one (highest search volume, the one that represents the whole niche best etc) to domain name, and pick the best / general keywords for category names. I then assign all the remaining keywords to these categories.

So, in general, I get something like a keyword tree - main domain name keyword, category name keywords, and the remaining keywords assigned to these categories (up to 3 word phrases only).

As soon as I have it done, I start writing posts, and I am wondering what would be the best / most effective way of distributing these keywords. I heard it is good to use one keyword per post...

Do I add category keywords to posts, if so how often. Do I use just one keyword per post, or more (for example 3 posts with category name keywords, and 7 with keywords assigned to these categories etc...)

Thank you.