Abstract: A biomass harvesting system for harvesting agricultural plant growth from agricultural fields comprises in operative combination a power source for providing mechanical and electric power to the system, a biomass accumulator for producing discrete units of accumulated biomass and a windrower for feeding biomass to the biomass accumulator. The system also includes a biomass quality analyzer for determining a set of quality characteristics of the accumulated biomass, a dirt control system for controlling the quantity of dirt in the accumulated biomass, and a ground cover residue monitor for determining on optimal quantity of biomass residue to remain on the agricultural field. An active tracking system identifies individual ones of the discrete units of accumulated biomass.