Abstract: A dispenser assembly particularly adapted to selectively dispense predetermined amounts of dry fertilizer or other dry material onto an area of disbursement, such as a plant, and including an elongated dispensing conduit having a holding chamber of predetermined dimension connected thereto along with a control mechanism such that selective operation of the control mechanism will automatically dispense, by gravity, a premeasured amount of dry material onto the disbursement area. A double disk valve mechanism is provided having an inlet valve and an outlet valve simultaneously translatable to open one end of the holding chamber and close the respective other end. In an embodiment, the outlet valve is selectable from a plurality of valve plates to vary the dispensing amount. A gun-shaped valve mechanism is provided as the control mechanism in a preferred embodiment.