NOVELTY - The gas yield improvement in biogas-plants (1) in which products are made available as bio-substrate (raw products) in the form of fragmented phase and a further component in the form of a continuous phase. The products are subjected to fermentation, and biogas, sediments and/or substrate are developed by the fermentation. The fragmented phase is comminuted or chopped to a size smaller than the existing dimension before mixing of the fragmented phase with continuous phase. The mixing of the products takes place spatially separated from the fermentation and in the space of the fermentation.    USE - Used for production of biogas from products resulting in agriculture.    ADVANTAGE - Simple, more economical and high yield of the biogas in plants.    DETAILED DESCRIPTION - The gas yield improvement in biogas-plants (1) in which products are made available as bio-substrate (raw products) in the form of fragmented phase and a further component in the form of a continuous phase. The products are subjected to fermentation and biogas, sediments and/or substrate are developed by the fermentation. The fragmented phase is comminuted or chopped to a size smaller than the existing dimension before mixing of the fragmented phase with continuous phase. The mixing of the products takes place spatially separated from the fermentation and in the space of the fermentation. The products are preheated before the fermentation and spatially separated from the fermentation. A part of the mixture taken from the fermentation space is circulated in a cycle and cooled. Corn containing the entire plant including the corn cob, complete plant silage in a very ripe pasty state, and grass silage are used as the bio-substrate. The bio-substrate is minced on a cut length of 1-3 mm. Liquid manure is intended as the continuous phase.    An INDEPENDENT CLAIM is included for an arrangement for gas yield improvement in plants for producing biogas from products resulting in agriculture.    DESCRIPTION OF DRAWING(S) - The figure shows an arrangement for gas yield improvement in plants for producing biogas from products resulting in agriculture:    Biogas-plant; (1)    Fermenter; (2)    Supply container; (3)    Comminutor; (4)    Mixing container; (6)    Heat exchanger. (7)