The disruption is probably not in the form of traditional hardware. You'll have to attack a different problem that tractors or other heavy farm equipment solve.

For example, can you bioengineer bugs that keep plants safe, but eat weeds or pests? This is part of the tractor's job: chemical spray. Can you create a swarm of planters to efficiently distribute the seed? Can you do either of these or more with an open platform? Can you survive the onslaught of legal attack from the megaliths you're trying to topple?

If neither foes nor loving friends can hurt you, If all men count with you, but none too much; If you can fill the unforgiving minute With sixty seconds’ worth of distance run, Yours is the Earth and everything that’s in it, And—which is more—you’ll be a Man, my son!