NOVELTY - A novel assembly to generate a biogas, from solid agricultural waste, has a fermentation vessel (12) for the fermenting medium (10) and a supply container (20) holding the waste for fermenting. A feed unit (18) charges the fermentation vessel (12) automatically with the waste material.    USE - The assembly is for the production of a biogas such as methane, as a fuel for a modified diesel motor, from agricultural waste such as manure, old grease, food waste, corn, root vegetables, fruit, vegetables, cereals and stable manure.    ADVANTAGE - The assembly gives an effective fermentation of solid waste material, with an automatic feed system requiring a low labor element.    DETAILED DESCRIPTION - A novel assembly to generate a biogas, from solid agricultural waste, has a fermentation vessel (12) for the fermenting medium (10) and a supply container (20) holding the waste for fermenting. A feed unit (18) charges the fermentation vessel (12) automatically with the waste material. The material feed (18) has a pipe (22) where the material is pressed through, opening into the fermentation vessel (12) under the floating cover (14) on the surface of the fermenting medium (10). A piston (28) forces the material into a holding pipe (24), leading into the feed pipe (22), and of a larger diameter than the feed pipe (22). The piston press stage is at a higher level than the fermenting medium (10). The base (32) of the waste supply container (32) is angled to move the waste material out through an opening (36), where a vertical push unit (38) diverts it into the holding pipe (24). The material feed (18) can also have a push rod to move the emerging material from the container outlet (36) into the feed press stage. The feed pipe (22) has a heating coil (44) to raise the temperature of the waste material being fed through. At least one spray unit can be fitted to the feed pipe, to spray a fluid into it, at a kink in the feed pipe path and at the outer radius of the kink curvature. Several spray units can be distributed around the circumference of the feed pipe, behind each other.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the biogas production assembly.    fermenting medium (10)    fermentation vessel (12)    floating cover (14)    feed system (18)    supply container (20)    feed pipe (22)    holding pipe (24)    piston (28)    angled container base (32)    container outlet opening (36)    vertical push unit (38)    pipe heating coil (44)