A system for harvesting nitrogen, comprising a motored robotic litter processing vehicle including an elongate housing creating an inner space for mounting components. A nitrogen harvester box connected to a rear portion of the vehicle is provided including a vacuum canopy connecting four sides to a floor, and wheels. A scoop level to ground having an opening facing the vehicle is enabled to collect litter material including nitrogen. A sieve screen having a mesh size positioned laterally at a height above the floor enables nitrogen particles smaller than the mesh size to fall through the sieve and nitrogen particles larger than the mesh size to be captured on a top surface of the sieve, wherein a vacuum chute collects the particles smaller than the mesh size and deposits them into a collection bin.
