I can understand why the golf course people would want DST: it would get light later, resulting in people able to play golf after work. And the opposite for cinema. Industry has a variety of reasons, one of which is proximity to Chicago and integration with their time. But why does the farm industry care? DST doesn't alter the number of daylight hours, it just changes when they happen! I remember hearing a few years ago about some lady in Indiana who wrote to her state rep asking for DST because her roses would get more light...
The farmers come with the silly argument that they will be in the fields later (clock time) after the farm implement stores close and they won't be able to get to town in time to buy parts and service. Don't ask me to explain it, but that's what they say.