I think using a tractor personally is counter intuitive imo because it doesn't really fit with the overall theme of Stardew Valley. I am big on adding things that can make stardew valley a more appealing game , but tractor's I just think is counter intuitive given we already have the tools to be able to plant seeds , fertilize, water and grow crops.
i think there was a replacement mod a while ago that turned the horse into a tractor. maybe check the stardew valley mods forum? EDIT: Here it is, except it does exactly what youd expect a tractor to do: https://community.playstarbound.com/threads/gameplay-mod-tractor-mod.126955/ ta dah!