1. Apparatus for preparing stable humus from a batch of organic waste material of known recipe, said apparatus comprising a reactor vessel having a longitudinal axis, means for rotating said reactor vessel about said axis, a manifold assembly positioned within said reactor vessel for distributing variable amounts of air within and throughout said reactor vessel to control batch temperature and oxygen levels, at least one stationary wand within said reactor vessel and extending transversely of said reactor vessel in a plane perpendicular to said vessel axis, said wand having a plurality of temperature sensors and a plurality of gas inlets evenly spaced therealong, and a control means for calling for, collecting, monitoring and storing sensed temperatures from said temperature sensors and for calling for, collecting and analyzing gas samples from said gas inlets, and storing the results of said analyzing of said gas samples, and for distributing air through said manifold assembly and/or actuating said reactor vessel rotating means in response to said monitored temperatures and said analysis of said gas samples to optimize temperature and oxygen levels throughout the various stages of humus production and for ascertaining when a stable humus has been achieved.