OPTIMIZATION TIPS AND TRICKS
Before going to a discussion about optimization on ads let me ask you a question. Do you know what is first ad unit in Adsense ads? First ad unit is the most important feature in optimization. This important feature is generally overlooked by new Adsense publishers.
The first ad unit shows the most paying ads for your site. First ad unit means which ad code you have placed first in your html code. Be careful!! First ad unit doesn't mean that ad unit which ad unit appears in top of your page.
By using channels you can easily track which ad unit is getting maximum no of clicks. If that ad unit which you have entered first has maximum CTR you need not to change it.
But if other ad unit gets maximum CTR then remove all the ad code. Then enter ad code for that unit first in your html code. Suppose your ads below content gets maximum CTR. But when you entered your ad code you placed ad code for ads on top first. In that case enter the code first for below content ads and then others.
Fore more clarification see what Adsense team member said:
This types of tips and tricks you can found in Adsense Blog written by Adsense Team members. So must make a practice to read Adsense blog when you have got time.
You will also find latest features and many other helps of Adsense there.
I don't want to say much about optimization on ad placements, ad formats and ad colors. Adsense help center has excellent tips on it. So one should must read their optimization tips for a greater clarification.Optimization tips can be found on Resource tab in your Adsense account.
Main points from their tips are:
1.Choose a wider ad format(380x280 large rectangle),(360x250 medium rectangle),(160x600 wide skyscraper)
2.Choose ad colors relating to your website color
3.Place ads where your visitors can easily see it