Abstract: In a sowing assembly for single-seed sowing machines, the housing forms a vacuum chamber (1). In the housing is mounted a drive shaft (4) which carries a mounting plate (7) to which is in turn releasably fixed an apertured plate (8) whose radially outer edge is supported on a seal (10) located at the edge of the vacuum chamber (1). A pot-shaped cover member (31) which is supported on the edge of the vacuum chamber (1) forms a seed holding chamber (44) which communicates with a seed receptacle (37).

Abstract: A single seed drilling machine has a rotatable drum the interior of which is connected in use to a source of reduced pressure. The drum is closed by a plate which has a circle of suction holes, so that seed can be held at the holes against the outer surface of the plate. Within the drum an interrupter device engages the plate to close a hole in the lowest region of the plate. Adjacent that hole, outside the plate, is a seed ejector device. Thus in the lowest region of the rotatable plate, the suction holding seed at a hole is temporarily rendered ineffective, at which time the seed is directed away from the plate by the ejector device.