An agricultural system comprising: an agricultural baler, comprising: at least one movable density door (210A, 210B, 210C); at least one fluid cylinder (220A, 220B) for moving the at least one density door (210A, 210B, 210C) and comprising a fluid chamber (322A, 322B) and a piston (323A, 323B) disposed in the fluid chamber (322A, 322B) to separate the fluid chamber (322A, 322B) into a piston side (324A, 324B) and a rod side (325A, 325B), and a cylinder rod (221A, 221B) coupled to the piston (323A, 323B) on the rod side (325A, 325B); and a fluid supply circuit for suppling working fluid to the at least one fluid cylinder (220A, 220B), the fluid supply circuit being selectively connectable to the at least one fluid cylinder (220A, 220B) such that, in a first fluid supply mode, the fluid supply circuit is connected to the at least one fluid cylinder (220A, 220B) to supply working fluid to only one side of the fluid chamber (322A, 322B) and that, in a second fluid supply mode, the fluid supply circuit is connected to the at least one fluid cylinder (220A, 220B) to supply working fluid to both the piston side (324A, 324B) and the rod side (325A, 325B) of the fluid chamber (322A, 322B); characterised by a control unit configured to: receive density-data indicative of a desired bale density for bales produced by the agricultural baler; determine a supply-mode-control-signal for setting the fluid supply circuit to its first or second fluid supply mode, on the basis of the density-data; and provide the supply-mode-control-signal to the fluid supply circuit, and further characterised in that the fluid supply circuit is configured to supply working fluid to only the piston side (324A, 324B) when the fluid supply circuit is in the first fluid supply mode. an agricultural baler, comprising: at least one movable density door (210A, 210B, 210C); at least one fluid cylinder (220A, 220B) for moving the at least one density door (210A, 210B, 210C) and comprising a fluid chamber (322A, 322B) and a piston (323A, 323B) disposed in the fluid chamber (322A, 322B) to separate the fluid chamber (322A, 322B) into a piston side (324A, 324B) and a rod side (325A, 325B), and a cylinder rod (221A, 221B) coupled to the piston (323A, 323B) on the rod side (325A, 325B); and a fluid supply circuit for suppling working fluid to the at least one fluid cylinder (220A, 220B), the fluid supply circuit being selectively connectable to the at least one fluid cylinder (220A, 220B) such that, in a first fluid supply mode, the fluid supply circuit is connected to the at least one fluid cylinder (220A, 220B) to supply working fluid to only one side of the fluid chamber (322A, 322B) and that, in a second fluid supply mode, the fluid supply circuit is connected to the at least one fluid cylinder (220A, 220B) to supply working fluid to both the piston side (324A, 324B) and the rod side (325A, 325B) of the fluid chamber (322A, 322B); characterised by at least one movable density door (210A, 210B, 210C); at least one fluid cylinder (220A, 220B) for moving the at least one density door (210A, 210B, 210C) and comprising a fluid chamber (322A, 322B) and a piston (323A, 323B) disposed in the fluid chamber (322A, 322B) to separate the fluid chamber (322A, 322B) into a piston side (324A, 324B) and a rod side (325A, 325B), and a cylinder rod (221A, 221B) coupled to the piston (323A, 323B) on the rod side (325A, 325B); and a fluid supply circuit for suppling working fluid to the at least one fluid cylinder (220A, 220B), the fluid supply circuit being selectively connectable to the at least one fluid cylinder (220A, 220B) such that, in a first fluid supply mode, the fluid supply circuit is connected to the at least one fluid cylinder (220A, 220B) to supply working fluid to only one side of the fluid chamber (322A, 322B) and that, in a second fluid supply mode, the fluid supply circuit is connected to the at least one fluid cylinder (220A, 220B) to supply working fluid to both the piston side (324A, 324B) and the rod side (325A, 325B) of the fluid chamber (322A, 322B); characterised by a control unit configured to: receive density-data indicative of a desired bale density for bales produced by the agricultural baler; determine a supply-mode-control-signal for setting the fluid supply circuit to its first or second fluid supply mode, on the basis of the density-data; and provide the supply-mode-control-signal to the fluid supply circuit, and further characterised in that the fluid supply circuit is configured to supply working fluid to only the piston side (324A, 324B) when the fluid supply circuit is in the first fluid supply mode. receive density-data indicative of a desired bale density for bales produced by the agricultural baler; determine a supply-mode-control-signal for setting the fluid supply circuit to its first or second fluid supply mode, on the basis of the density-data; and provide the supply-mode-control-signal to the fluid supply circuit, and further characterised in that the fluid supply circuit is configured to supply working fluid to only the piston side (324A, 324B) when the fluid supply circuit is in the first fluid supply mode.