[Yo-Yo]

Now, I’m no farmer, but wouldn’t a guide wire buried in a field cause havoc with plows and harrows?

No longer any need. You now have GPS guided tractors for plowing, and GPS guided Combines for harvesting. The operator guides the tractor or Combine to a row, then the autopilot takes over and drives a perfectly straight line.

The Combine also monitors yield as it harvests, and provides a complete map of the field with yield data so the farmer knows what spots in the field may need more drainage, more watering, more fertilizing, etc.

https://www.nasa.gov/feature/directorates/spacetech/spinoff/john_deere

[ProtectOurFreedom]

I was just pointing out what I thought was the extreme impracticality of using in-ground wire guidance. GPS has been used for plowing for quite a while now and is going to drive a lot of smart ag.

[nomorelurker]

Those are spooky to watch with the tractor driver on a cell phone and no hands on steering or other controls. They can harvest and monitor FreeRepublic or whatever at the same time.