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Hi memmel, I like the idea of robot assisted farming. A unit similar to the roomba robot vacuum cleaner
http://en.wikipedia.org/wiki/Roomba
could happily wander a small area, destroy weeds and pests.
Perhaps a robotic worm/snake made up of many rotating sections which could help break up the soil and deliver fertilizers/biochar directly into the ground rather than the surface.
Possibly some type of light electric assisted exoskeleton powered from an overhead PV panel to provide shade to the operator would allow a single human to do the work of many labourers or fossil fuel powered tractors.
I think the snake is a fantastic idea seem my above post about hydraulics a snake powered by hydraulic pressure with a lot of fluidic controls with electronic isolated to the sensors makes a ton of sense. Depending on the design the hydraulic pressure can be done internally or externally or both depending on the need.