Before the Google adsense target ads on your blog, it is first crawled by bots called mediapartners bot. It crawls the whole page from top to bottom and allocates the ads according to the data it accumulates. There are different factors consider during allocation of ads. You can learn more in my post how do Google adsense target ads on a website. Mediapartners bot also consider the sidebar content as blog content which results in irrelevant ads and results in low click through ratio.
To overcome this issue Google has provided a simple solution yet very effective, which is called section targeting. Section targeting allows adsense publishers to suggest a section of a web page or blog post to give more emphasize. Which in turn results in more relevant ads and more clicks and hence more revenue.
To apply this trick open the single.php file of your template file. You can use default editor in wordpress or can use any text editor software. Now copy paste these two HTML files above the title and below the post content.
<!– google_ad_section_start –>
<!– google_ad_section_end –>
You can also ignore sidebar content using this following tag.
<!– google_ad_section_start(weight=ignore) –>
Your final code should look like this.
<html><head><title>Section targeting</title></head>
<body>
<!– google_ad_section_start –>
This is the content of your blog.
<!– google_ad_section_end –>
</body>
</html>
Quick Tip: If you are using the wordpress platform you can this plugin called advance adsense (http://wordpress.org/extend/plugins/advanced-adsense/) which do the same work without editing your template files.

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