This machine uses high pressure water to fracture a channel into the green and pulls dry sand down behind it. The goal is to dilute organic matter with sand. Programs like this are very important on USGA spec greens to ensure they have a long life. Otherwise drainage will fail, resulting in the need to rebuild greens. This is just one of several tools we use to accomplish this. We do this process twice a year.
You can see the disruption left. The surface is very puttable afterwards because we are simply injecting sand, which firms the surface. No cores are removed during dryjecting. For this reason, it is no replacement for standard core aerification because no organic matter is removed during the process.
The white sand spots are the dryject channels. You can see we adjust the pressure on the machines so the sand remains in the upper 2" of the soil profile. This is where organic matter accumulates. Below this level is the sand that was used during greens construction. It is a great mix and does not need to be diluted.
We started aerifying roughs today. Jerry Dalton will work on this until the club closes. Once we have the golf course to ourselves, we will be aerifying, verticutting and topdressing fairways. We always try to keep major disruptive processes in the months we are closed for play.