I like this voice recognition idea. It's definitely a something that could work wonders. Another challenge, however, would be the training for the farmers to use it. I currently work in an events planning facility as IT support. All of our work revolves around technology, but there are still a few people who I need to push to learn new systems (systems as small and simple as gmail). I think that maybe this is something that needs to be started small.. shown maybe through example.
Just as people step up and voluntarily work at Non Profits to save children and battered women and individuals struggling in poverty, people should step up and volunteer on farms --even administratively. This way, from the home-body to the outdoorsy-type, everyone would have a place to help on a farm.