From my experience as a surgical tech for 6 years, I have a few recommendations. Ditto on the Kotex pads! They have multiple uses, plus a good roll of at least 1" cloth bandage tape (duct tape works well too in a pinch). Pressure on a wound with a pad and tape will help stop bleeding and protect from dirt. You can make an eye patch or bandage easily with a pad and tape.
A small bottle of betadine solution (if you are not allergic to iodine!) Betadine is wonderful stuff for killing germs, and that is why it is widely used as surgical prep, and for cleaning wounds. A quart bottle of water. Good for irrigating wounds, eyes, treating dehydration, heat stroke etc.
If your allergic to stings..definitely keep an Epinephrine Pen in your kit! Also, a package of benadry pills (antihistamine) to help offset alergic reactions.
I would guess that most non lethal accidents involving tractors involve either crushing, or dismembering/mangling type injuries. That being the case, I would definitely recommend some type of tourniquet material...3 foot of 3/8" rope looped and tied to a 1 foot 1/2 inch dowel. Something you can place and tighten with one hand if needed. Applied quickly enough, it could save your life from loss of blood.
And as others have stated, a horn in a can, and a cell phone.
Bandaids, for small cuts, scrapes blisters. I'd probably include a small tube of neo-sporin, or bacitracin ointment.
All of the above can be packed pretty compactly. If you can't provide enough first aid with the above articles, you probably need a paramedic anyway!
Even if I were by myself, I would at least check in with a neighbor and have them come looking if I didn't check in with them at a certain time. Always let somebody know where you will be and that you will be alone. You don't wanna spend two days dying under a tractor wheel back in the woods.
I didn't really "grow up on the farm", but I personally know 3 people who were found dead many hours later either crushed under a tractor, or caught in machinery. Especially when alone, turn it off, let it wind to a stop, and set the brake or gears before leaving the seat!