Our primary cultivation tool is this Sundance disk. We bought it in 1994. It works by two disks peeling away at the surface of the bed followed by a chisel cultivating to a depth of 6” in the middle of the bed . Two more disks throw soil back onto the bed making a ridge. This is called conservation tillage as we only till the very top surface of the soil. We do not mix soil from the surface with that which lies 12” down. This means our soil microfauna stays where it likes to live, as does the nutrients the chickens very nicely deposit for us.