Suicide rates (in Australia, at least) increase with the remoteness of an area. This shows up as an industry phenomenon because farming is an industry that is only present in rural and remote areas. However men in unrelated industries who live in remote areas are also at significantly increased risk of suicide, and recent meta-studies have found a distinct lack of work actually differentiating between "farmers" and "non-farming rural residents", or even a standard definition of "farmers" (is the farmer's wife counted? What if she works off the farm as well?). (Making this differentiation is important because it influences the approaches taken to reduce suicide - e.g all rural people lack access to mental health resources, but if only farmers were committing suicide then that would appear not to be a significant factor)

A super short paper that points to lots of references - https://www.crrmh.com.au/content/uploads/Briefing-Paper_FINA...