There's nothing on this song at the Traditional Ballad Index, and just a little bit at Folktrax

JOHNNY SANGSTER - "Of a' the seasons of the year when we mun work the salt" Ch: "For you JS" - Female Bothy Ballad about Harvest attributed to William Scott of Fetterangus (b:1785) - variant of JOHNNY'S NAE A GENTLEMAN - ROUD#2164 - RYMOUR Club 1906 1 pp21-2 Greig - GREIG-DUNCAN 3 #407 (6 versions) - ORD BB 1930 pp265-6 Greig -- Alex ROBB #319 Strichen, Aberdeensh rec on Dictaphone cylinder by James M Carpenter 1929-35 - Mrs Alice MEARNS & group rec by Alan Lomax Aberdeen 14/7/51: 7"RTR-0681/ RPL 21415 (4v & ch)

There are 13 entries at Roud, so that's a pretty good start.

-Joe-