Method for operating an agricultural combine (2) on a field using at least one field-map (1), wherein the method comprises determining (S1) the position (3) of the agricultural combine (2) on the field (1), retrieving (S2) field related data from the at least one field-map related to the determined position on the field, and adjusting (S3) residue processing system (8) settings of the agricultural combine (2) based on the retrieved data. The residue processing system (8) settings comprise chopper (9) settings to influence an average particle size of residue expelled (11) by the residue processing system (8).
