NOVELTY - Synchronization of straw and biogas slurry on cultivation field, by crushing straw and stubble, throwing crushed straw and stubble on surface of field, spraying biogas slurry produced after anaerobic fermentation of biomass on field surface, plowing soil using plowing assembly, flattening soil, allowing the straw and stubbles to be buried deep inside the soil, performing soil compaction and repression, ensuring that the straw and stubbles are completely buried deep inside the soil and improving speed and degradation effects of the straw and stubbles in the soil.    USE - The method and working assembly are useful for synchronization of straw and biogas slurry on cultivation field (all claimed).    ADVANTAGE - The method is simple and performed using working assembly having simple structure, enables straw reusability in improved manner, restores soil, and has low operating cost, and high working efficiency, usability and reliability.    DETAILED DESCRIPTION - Method for synchronization of straw and biogas slurry on cultivation field, involves (a) crushing the straw and stubble left out after the cultivation process, and throwing crushed straw and stubble on surface of the field, (b) spraying biogas slurry produced after anaerobic fermentation of biomass by liquid spraying device on upper surface of the field that already contains crushed straw and stubble on its surface, (c) plowing soil on the field using plowing assembly, flattening the soil, and allowing the straw and stubbles to be buried deep inside the soil, and (d) performing soil compaction and repression, ensuring that the straw and stubbles are completely buried deep inside the soil and improving speed and degradation effects of the straw and stubbles in the soil. An INDEPENDENT CLAIM is included for working assembly, which comprises 3 frame assemblies installed on front, lower and upper portions of the working assembly, point suspension assembly, cutter shaft assembly for crushing straw and stubble, and running wheel assembly fitted in the frame assembly on right side, where the frame assembly is located on cutter shaft assembly in order to configure liquid spraying device of biogas slurry, plowing assembly and repression assembly.