Tractor Tires

I have a JD 1050 4Wdrive.
The front tires are wearing uneven as the one side of the tred is wearing more than the other side as outside vs inside.
Here is the question.
How do I correct/adjust toe in/tow out - that is to say the slant of the tire back to normal or even straight tracking?
I rotated the tires which is a temporary fix but not a long time correction or cure.
Thanks in advance.