A baler or a loading wagon, comprising: - a frame; - a receiver, for receiving crops; - a pick-up device, configured for picking-up the crops from a field; - a feeding assembly, including: a feeding channel, having an inlet, for receiving the crops from the pick-up device, an outlet, opened to the receiver for feeding the crops to the receiver along a feeding path and a bottom floor, including a plurality of slots; a feeding rotor, rotating in a feeding direction, to push the crops from the feeding channel into the receiver along the feeding path; - a cutting assembly, which is configured to cut the crops passing through the feeding channel and includes a plurality of knives, each one pivoting around a respective knife rotation point, between an extracted position, where the knife is at least partially inserted into a respective slot (131 C') of the bottom floor to protrude towards the feeding channel, and a retracted position, where the knife is retracted below the bottom floor; for each knife of the plurality of knives, a knife protection system, configured to retract the respective knife, selectively with respect to the other knives of the plurality of knives, in response to an external force applied to the respective knife, characterized in that each knife protection system includes a lever, rotating around a rotation point and connected to the respective knife in a driving point; an absorber element, connected to the lever and to the frame in a pushing point and in a locking point, respectively, and which is configured to apply an absorption force on the lever to urge the respective knife towards the extracted position; wherein for each knife protection system, in the extracted position of the knife, the driving point is spaced from the knife rotation point of a first distance, and, in the retracted position of the knife, the driving point is spaced from the knife rotation point of a second distance, wherein the second distance is smaller than the first distance. - a frame; - a receiver, for receiving crops; - a pick-up device, configured for picking-up the crops from a field; - a feeding assembly, including: a feeding channel, having an inlet, for receiving the crops from the pick-up device, an outlet, opened to the receiver for feeding the crops to the receiver along a feeding path and a bottom floor, including a plurality of slots; a feeding rotor, rotating in a feeding direction, to push the crops from the feeding channel into the receiver along the feeding path; a feeding channel, having an inlet, for receiving the crops from the pick-up device, an outlet, opened to the receiver for feeding the crops to the receiver along a feeding path and a bottom floor, including a plurality of slots; a feeding rotor, rotating in a feeding direction, to push the crops from the feeding channel into the receiver along the feeding path; - a cutting assembly, which is configured to cut the crops passing through the feeding channel and includes a plurality of knives, each one pivoting around a respective knife rotation point, between an extracted position, where the knife is at least partially inserted into a respective slot (131 C') of the bottom floor to protrude towards the feeding channel, and a retracted position, where the knife is retracted below the bottom floor; for each knife of the plurality of knives, a knife protection system, configured to retract the respective knife, selectively with respect to the other knives of the plurality of knives, in response to an external force applied to the respective knife, characterized in that each knife protection system includes a lever, rotating around a rotation point and connected to the respective knife in a driving point; an absorber element, connected to the lever and to the frame in a pushing point and in a locking point, respectively, and which is configured to apply an absorption force on the lever to urge the respective knife towards the extracted position; wherein for each knife protection system, in the extracted position of the knife, the driving point is spaced from the knife rotation point of a first distance, and, in the retracted position of the knife, the driving point is spaced from the knife rotation point of a second distance, wherein the second distance is smaller than the first distance. a plurality of knives, each one pivoting around a respective knife rotation point, between an extracted position, where the knife is at least partially inserted into a respective slot (131 C') of the bottom floor to protrude towards the feeding channel, and a retracted position, where the knife is retracted below the bottom floor; for each knife of the plurality of knives, a knife protection system, configured to retract the respective knife, selectively with respect to the other knives of the plurality of knives, in response to an external force applied to the respective knife, characterized in that each knife protection system includes a lever, rotating around a rotation point and connected to the respective knife in a driving point; an absorber element, connected to the lever and to the frame in a pushing point and in a locking point, respectively, and which is configured to apply an absorption force on the lever to urge the respective knife towards the extracted position; wherein for each knife protection system, in the extracted position of the knife, the driving point is spaced from the knife rotation point of a first distance, and, in the retracted position of the knife, the driving point is spaced from the knife rotation point of a second distance, wherein the second distance is smaller than the first distance.