I am doing some review for farm robotics and I stumbled upon that project, which I thought was pretty cool. I have met the people who are doing it 6 years ago, when they described themselves as “hippies working off the sustainability budget of Sony Research” and looks like now they manage to live off public European funding and open sourced their designs.
I meant their method to mechanically turn over the top soil to kill weeds. You can see it in the video.