Grass Clippings
It’s one of those rules that the greatest fools obey
Because the sun is much too sultry
And one must avoid its ultra violet ray
Noel Coward wrote the lyrics to Mad Dogs and Englishmen while driving from Hanoi to Saigon ‘without pen, paper, or piano’. Coward elucidated: ‘I wrestled in my mind with the complicated rhythms and rhymes of the song until finally it was complete’. This last week the sentiment of that wistful tune from 1931 still applied with the amendment that Mad Dogs and Englishmen and Greenkeepers go out in the midday sun.
The peak of the heat wave last week coincided with the green’s renovation programme, which made the operation a more arduous a task than normal. It was already decided to postpone the July renovation programme to give Members the use of the course unimpeded, after 13 weeks of lock down. But our altruistic attitude has meant we have been suffering in the heat as the works were truly necessary.
During last wintertime several of the greens were holding too much water in one of the wettest winters on record. Due to the lock down, we had to cancel the works in March as the contractor could not work freely on site due to the restrictions of movement. We therefore we put the task on hold, in the hope that the restrictions would allow the work to continue. So, it was a relief to see the big boys’ toys arrive on the back of a low loader on Tuesday last, ready for the works to be completed. It is quite the invention as machines go; set of oversized drill bits sink on a block formation 12 inches plus into the greens and literally drill out material from the green profile.
The drills are hollow and allows sand to be forced down them when they are extracted from the soil. From the material that the drills augured to the surface found, they had indeed punched through a layer of material which had probably been laid down within the greens surface in the 1950’s rebuild of the course. The greens created on the course from this process 70 years ago used generically sourced materials that they could find on the site. Ian Vass, our oldest serving member of the team remembers that a seam of sand was discovered around 20 feet below the top end of the course and had been utilized and combined with native soil to create what is known in the trade as ‘push up greens’.
This was well before the days when we had turf laboratories to analyse materials rigorously to ensure their suitability for growing grass upon them and for the drainage potential. It was not until the Untied State Greens Association started field trials in the 1960’s that the whole study of materials selection evolved and became an intrinsic part of turf science.
In the 1970’s and 80’s, the soil transfer theory of coring and adding sand to the surface of the greens became an excepted practice, for the need to improve greens and remove organic matter was accelerated. Over the years the materials in our greens have most likely settled and compacted, as finer particle materials will block the pores between slightly larger particles. Coring and spiking with normal equipment can only reach down so far and the offending material has sat lurking, out of reach to still cause an issue.
Technically, this feature of consolidated material is called a pan and can lead to a situation of perching or perched water table, where free drainage is impeded or compromised, water starts to accumulate in the greens surface instead of draining away. By drilling down and replacing material from the greens with a column of sand, it allows water to freely move through the profile and connect with the drainage below. We eagerly await to see the results of this work this coming winter and an improvement to the greens being a lot dryer during wet weather periods. As the majority of the Roehampton Club greens are push up greens, it is going to be desirable if not a necessity to do the other greens in the future to ensure we are maximizing the movement of water in the greens during winter. Through all our endeavours to improve the surfaces at the Club, perhaps we can recall another of Noels songs from the past, London Pri