Crop chopper arrangements for agricultural machinery

A method of spreading a flow of chopped crop substantially rearwards relative to a direction of travel of an agricultural machine, the method comprising the steps of:

• receiving a flow of chopped material from a chopper;
• and guiding portions of a flow of chopped crop in a plurality of streams of different concentration or focus to different portions of a crop gathering window as defined by a plurality of guide vanes, wherein the guiding step includes releasing one portion of the flow of chopped crop along a generally straight aligned first trailing edge of a first guide vane later than releasing another portion of the flow of chopped crop along a generally straight aligned second trailing edge of a second guide vane associated with a difference of a first slope of the generally straight aligned first trailing edge of the first guide vane relative to a second slope of the generally straight aligned second trailing edge of the second guide vane, the second guide vane positioned laterally outward from the first guide vane relative to a longitudinal axis of the agricultural machine.