Thanks Martin. I've done a bit more digging.

According to this site, it was John Mary Doyle (1896-1969) who composed The Green Fields Around Ferbane.

It also says.......

"This poem was probably written in the 1940s. The content and metre are identical to an earlier poem, Lusmagh's Fields So Green. The Lusmagh poem was written in 1926 by Edward Dolan and deals with a specific emigrant to Australia. We don't know of any factual background to John's work. It is probable that it was the Lusmagh poem that prompted John to pen the now more-famous poem. The air, based on an older melody, was put to it by John himself."

Lusmagh's Fields So Green I understand was written in 1908, not 1926. I'm just wondering was that ever recorded.