Certainly Irrigation has lead to an enhanced standard of "green".
Ancient links courses which had fine fescues for years and lived through occasional droughts can now be watered on a nightly basis.
As a result the soil profile can be kept moist permanently, usually recommended at 15 to 20 per cent.
The fine fescues which are an important aspect of links golf (non lush, lignaeous thatch, low height of cut) can develop very deep roots of 2 feet or more when searching for a moisture source, are reputed to have good drought tolerant characteristics.
However when the moisture is available at the top of the soil profile the fine Fescue roots do not need to go deep and remain near the surface.
Due to the moisture content at the top of the soil profile, surface-rooting grasses, particularly Poa Annua, can establish.
When the extremely high temperatures arrive in midsummer the upper surface
of the soil profile dries out in the midday sun (when the irrigation is switched off for the golfers) and the grasses go brown.
This would be followed by overwatering, which the fine fescues can not endure.
As a result - destruction of the fine Fescues and the substitution with lush grasses.
How is this possible? Fine Fescues are supposed to be drought tolerant
The fine Fescue grass were destroyed, not by the drought, but by a combination of their low resistance when the roots are near the surface and by the overwatering.
In order to allow the fine Fescues to achieve their drought tolerant characteristics they must develop deep roots by a contolled "starvation" of the soil of profile.
However during controlled "starvation" the fine Fescues will turn to a faded green or even a straw colour and Poa Annua will die.
This faded green and is too much for the sensibilities of some golfers. After their game, the "lack of green" then gets negative comment by the golfers on the terrace, some more influential, than others. The critic is then conveyed to the managers and committee members who then quiz the head greenkeeper.
So the irrigation goes back on.
It requires a good understanding of Fescues of not only the Head Greenkeeper but also the leaders in the Club House to impose and defend a "Starvation" regime against the "lovers of green".
Last year I played all the links courses between Connemara and Ballyliffin in August/September and some were greener than others.
The difference of green Enniscrone and straw like Ross's Point was noticible.
I'm sure Ali can provide a better comment.
So irrigation has generally not been good news for fine Fescues and thus the ground game. Hopefully the exceptions may help to prove the rule of the "Starvation" practise.