Shockwave

Soil compaction and drainage are two of the most important factors for growing good, healthy turfgrass. Dating all the way back to construction, we have dealt with some severe compaction issues from the earth moving equipment that performed the renovations. Especially, in some approach areas, the compaction has led to struggling turf over several years. Last week, we tested a different type of aerator to help alleviate some of the tight soils.

The machine we tried is called a Shockwave and it is a linear aerator. Instead of poking holes down into the soil vertically like a traditional aerator, the Shockwave has 12” knives that slice down into the soil and then carve a channel linearly as the machine moves forward. Working depth can be set from 4-10”. The blades are offset on the shaft so that across the machine there are always blades in the ground, and multiple blades per position so that a blade is always down in each channel creating a continuous slice. The Shockwave is very good at breaking up hard soil, and it can also help with drainage because water will follow the new channels.

It is hard to see, but this is a photo of
the knives that slice down into the soil

Since we were only testing the machine, we prioritized our most troublesome areas to work through first. We made multiple passes across every approach, with some approaches getting more attention than others. We ran the machine in several different directions, trying to break up as much compaction as possible, and we also made some angled passes from higher points to lower points to help move water more efficiently. Although the machine must be operated slowly- the company recommends .5-1 mph- it was very easy to use and left a clean, playable surface behind.

After completing the approaches, our next priority was some drainage swales on #15 fairway, a large portion of #17 fairway, and a large portion of #18 fairway. These were all areas that were heavily excavated and compacted during construction also and that give us trouble throughout the year. Finally, we did a section from about 100 yards and in to the green on #1, two small sections on #4 fairway, all along the right side of #5 fairway, everything from 200 yards and in to the green on #7 fairway, and a few very small areas on #11, 12 and 13 fairways. We finished with the machine over on the soccer field, which interestingly enough, had a few areas of soil that even the Shockwave couldn’t penetrate!

All this work was done at a depth of about 4.5-5”. It will take some time to see the full benefits of the aeration, but we did break through some hard soil, which can only help the health of the turf. As the turf continues to grow through this season, it should be able to root better and slightly deeper because of the lines we cut. This better rooting will lead to a stronger plant now and for the winter, and the stronger the plant is for winter, the better it breaks dormancy in the spring. Moving forward, if we were to purchase one of these machines, we would work on cutting deeper in some of the trouble areas, as well as slicing more acreage in total.

In the short term, there are some stolons of Bermuda grass that were cut by the knives and wilted and died, though fewer than we expected. The healthy Bermuda grass will heal in over these lines in a short time and all the scarring will disappear. There should be some immediate impacts on water movement through the sliced areas as water will find these channels and flow easier.

Even though we were only testing the machine, we were able to work through all our top priorities before our time was up. This is not a cure for all that can hurt the Bermuda grass, but if we can slowly work on reducing the factors working against the turf, the turf health will continue to improve.

 

Etiquette Reminder of the Month

When you splash bunker sand onto the green after your shot, please brush away any large piles or clumps that may have ended up on the green.

Also, as part of a Golf Committee initiative to improve course etiquette, we have included links to videos teaching proper on course etiquette. Please take a moment to watch:

Ball Marks - How to properly repair

Golf Cart tips

 

 

See you on the course!

Joe

jvillegas@bwrc.org