It's hard to change the stance on a wheeled vehicle, I think that agriculture might be one domain where a legged platform could develop an advantage (if it were sufficiently energy efficient to begin with, wheels really are the greatest human invention).
Legged for agriculture, to handle uneven terrain? Outside of reforestation, I don't see how it can be a significant advantage?
In soil-based growing, one needs to maintain the soil/ground and making/keeping it flat becomes a relatively minor point. For soil-less (hydroponics etc), I'd expect the whole 'field' to be automated, possibly with the produce moving instead of moving to the produce.
This how modern salad farming happens for instance.
