A cutting assembly for a header of a plant-cutting machine is disclosed. The cutting assembly includes an elongate blade support bar comprising a first elongate segment that can engage a second elongate segment by interlocking. Overlying the elongate blade support bar is a plurality of blade sections, including (1) a first sub-plurality of blade sections overlying a first lengthwise portion of the first elongate segment, and (2) a second sub-plurality of blade sections overlying a second lengthwise portion of the first elongate segment and a third lengthwise portion of the second elongate segment. An elongate attach bar overlies the first sub-plurality of blade sections, and a spanning bar overlies the second sub-plurality of blade sections.
