Abstract: An adjustable down pressure mechanism is disclosed for use in association with a furrow forming apparatus of a seed planter. A parallel linkage arrangement is provided for mounting the apparatus on a tool bar of a tractor or the like, whereby the apparatus can follow the contour of the ground for efficient and consistent furrow formation. The down pressure mechanism comprises one or more springs operatively extending between upper and lower links of the parallel linkage. An upper support member for the springs is configured for convenient adjustable positioning along the upper links, whereby the pressure exerted by the springs on the furrow forming apparatus can be readily varied.

Abstract: A dispenser that includes a vertical wall, a selector drum having an open end mounted for rotation in sealing relationship on the wall, the drum having circumferentially spaced openings about its periphery for seeds, a seed hopper having a conduit for supplying seeds to the interior of the drum through an opening in the wall, a blower fan supplying air to the interior of the drum through an opening in the wall, seed cut-off and singling structure for removing extra seeds picked up by the openings in the rotating drum, and a seed discharge structure located 90.degree.

Abstract: A row unit with a mechanism which provides normal planting via a parallel bar linkage connection to the planter and which can be locked up in a raised, non-planting position when desired. The mechanism includes curved slotted openings in the lower bars of the linkage for frame mounted spacers as the frame pivots about the connection with the upper bars, and locking structure having detents to engage the spacers in the lowered working and raised non-working positions. The mechanism also prevents the release of the locking structure until the row unit weight is lifted therefrom.