An agricultural harvester with a flexible crop residue management system. A pivotal swath door and displaceable windrow chute are coordinated to be displaced between positions in which all of crop residue is spread laterally and another position in which straw in the crop residue is directed in a windrow by a windrow chute and the chaff is directed laterally. The windrow chute and swath door are each pivotally mounted and a linkage is provided between the windrow chute and swath door in the form of bars extending in between rollers to displace the windrow chute in coordination with the displacement of the swath door.

A concave extends circumferentially about a portion of a rotor of a rotary processing unit of an agricultural combine. The concave has threshing beds forming openings therebetween for grain to pass through from a path of crop material between the concave and the rotor. The path of crop material has a flow direction relative to the concave in response to rotation of the rotor in a threshing direction. Each threshing bed includes a first extremity defining a threshing edge, a second extremity, and a separating grate extending across one of the openings between the first extremity and the second extremity, the first extremity overlapping the second extremity of an adjacent one of the threshing beds, locating the threshing edge in the path of crop material facing opposite to the flow direction. Each threshing bed extends from its threshing edge to its second extremity in the flow direction.

A concave for an agricultural combine includes threshing beds carried by a base frame and forming openings therebetween for grain to pass through. Each threshing bed includes a first end, a second end, a length from the first end to the second end, an inner extremity, an outer extremity, and a separating grate extending across one of the openings for separating grain from threshed crop material. The separating grate extends along the length between the first end and the second end, is between the inner extremity and the outer extremity and includes grate openings and spaced-apart bars. The bars are between adjacent grate openings and include struts each connecting two adjacent parts of the separating grate between adjacent grate openings and severed bars each including bar segments extending inwardly toward one another to respective free ends on either side of a gap between adjacent grate openings.