“In an ideal world, every farmer would test fields each time they come out of soybeans, but the best place to start is with those problem areas in fields with unexplained yield loss,” Mangel said.

Source: https://www.thefencepost.com/news/scn-experts-share-how-to-put-scn-soil-test-results-into-action/

Joe Mangel was played by Mark Little and first debuted on-screen in the episode airing on 8 August 1988 and left the show in 1991.

Source: https://www.dailystar.co.uk/tv/neighbours-karl-kennedy-star-drops-31017255