That first one is really cool! The only suggestion I have for the first one is maybe take two photos with one exposed for the tractor and one exposed for the sky and merge them in editing. I have never really done much editing like that but I know you can do it on Photoshop elements at least.
One thing I would change for the middle one is try and get a little more of the hay in focus. As it is, it almost seems to hurt my eyes trying to find what to focus on.
I like the last one a lot. I live on a farm as well and I’m always trying to get “artistic” photos of hay but have never really succeeded. 🙁