Here is a good article from Stan about dryjecting. We are hopefully going to employ this process this year.This picture is an example of a Dryjected column of sand. This is done by blowing sand into the profile of the green as a firming technique. It technically raises the bulk density of the profile and can get firmer sands into the mix. This is not a substitute for core aeration.
http://www.usga.org/course_care/regional_updates/regional_reports/midatlantic/Preparing-Congressional-CC-For-The-U-S--Open---May-2011/
