(DE3828186-C)      A stack of organic waste for microbacterial conversion into useful prods. is an ordered assembly of different materials in homogeneous layers. On a base of sawdust-size wood particles rest in order layers of greenery, wet-surfaced straw, animal at least partly from cattle, and more saw-dust. Contain wide limits are suggested for specific layer thicknesses, and for the proportion they form of the total sequence. The sawdust layers are thick enough to retain volatile emissions. The entire stack may be surrounded by a saw-dust by a saw-dust layer.    ADVANTAGE -   Stack is more completely converted into fertiliser, ground improver etc., than with randomly mixed materials. @(6pp)    (EP356816-B1)      Method of converting bio matter into soil-improving, fertilising and/or plant growth substrate materials, in which the heaped and possibly comminuted bio composition is subjected to the action of natural decomposition processes until the desired degree of conversion is reached, the bio composition being substantially enclosed on all sides by a covering layer, wherein the covering layer, consists of finely comminuted organic material, substantially of sawdust grain size, and is of such a thickness that the volatile constituents occurring with the conversion are substantially completely retained.    (DE58901480-G)      A stack of compost suitable as fertiliser or as base material for growing plants is formed from specific types of bio-mass arranged in fixed order. A lowest layer is of wood reduced to saw-dust particle size, and is surmounted in order by layers of greenery (leaves, etc.), of surface-wetted straw, of manure (pref.    from cattle) and a final layer of the wooden material. The layers have pref. percentage and absolute thickness values. The fine material forming the base and top layers, and derived from various plant stalks if not from wood, and extended down the sides of a sloping stack, ensures that evolved gases and vapours stay within the stack.    ADVANTAGE -   Bio-mass is more effectively converted than if mixed at random.    (RU2051136-C1)      A stack of compost suitable as fertiliser or as base material for growing plants is formed from specific types of bio-mass arranged in fixed order. A lowest layer is of wood reduced to saw-dust particle size, and is surmounted in order by layers of greenery (leaves, etc.), of surface-wetted straw, of manure (pref. from cattle) and a final layer of the wooden material. The layers have pref. percentage and absolute thickness values. The fine material forming the base and top layers, and derived from various plant stalks if not from wood, and extended down the sides of a sloping stack, ensures that evolved gases and vapours stay within the stack.    ADVANTAGE -   Bio-mass is more effectively converted than if mixed at random.