Are you calibrating your air blast sprayer?  You should be.  Check out these videos that show how to do it:

Part 1: http://www.youtube.com/eViticulture#p/a/f/1/QW7MOuEHP48

Part 2: http://www.youtube.com/eViticulture#p/a/f/0/_mAB41soyxE

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