I would be surprised if this doesn't exist already in some nascent form?

This is an area where you would probably need entire ecosystem of systems that are onboard tractors, but also for the various implements you hook up to it to monitor sowing, fertilizing, spraying etc. Including backend systems that you can either self-host or subscribe to some service that doesn't have awful terms.

It shouldn't take immense amount of capital to make some real progress towards something that can make a difference.