TEPaul
'That's interesting what you say about new roots going deep and then dying back. I've never heard that before but my understanding of agronomy still has a long long way to go.'
My experience is limited in this area to a small number of greens. However, when these greens were first sown, we had very deep roots down through the sand profile (USGA style of green) to over 200mm, or 8 inches). Then, when the green has gone into play, and the irrigation/maintenance regime is aimed at providing a surface, some of the lower roots are lost. I am sure some of this is due to the soil characteristics, and the ability to drain in winter whilst retaining water in the sub-soil in summer during our droughts. I expect any drying out of the lower strata of soil will lead to the loss of the deeper roots. Thats why I am impressed with the deep root growth with infrequent watering.
'But Wayne talked to him about the new "A" or "G" strains, not me, and Wayne said he doesn't like it. I don't know why since obviously he probably hasn't used it or worked with it.'
I've discussed this matter with our course supt, and with several others in Melbourne. There will always be a 'new, best and latest' turf-type. Its like computers, and TV's, and cars. There will always be a new product. But some courses have worked out that their existing greens are just fine.
I've seen good courses in Melbourne where the greens turf is still the that from 50 years ago when the course was built (brown top and poa, and this is used vegetatively to establish any new nurseries). I guess St Andrews is the prime example of this.
Royal Melbourne is an example where probably 15 years ago theyd ecided to replace the greens with a more modern grass type (?was it penncross) and disliked the playing style that eventuated (the 'maintenance meld' was changed). So, they went back in history, back to the original sutton's mix, and back to the way the course played.
At Kingston Heath, they are succesfully replacing their Egmont greens with A1 (I think the program is nearly complete). I understand that maintaining Egmont in summertime was a significant problem, hence the change to A1.
However, other courses (eg Metropolitan) continue to use older but somewhat modern varieties such as Dominant. Our club uses mostly this mix, plus some poa of course.