Abstract: A liquid fertilizer metering apparatus 130 which includes a metering assembly 148, FIGS. 11-18, that meters through its orifice 155 the liquid material contained in a pliable bag 134 disposed in a sealed pocket 132 of the apparatus. A passageway 142 from an exit pressure location in an Venturi tube 141 provides water flow into pocket 132 to pressurize bag 134, thereby discharging the liquid material through the metering assembly 148 and into another passageway 145 in the apparatus that is connected to the restricted throat 142 of the Venturi tube, thus releasing such material into the water flow conduit to which the tube is attached. Metering assembly 148 comprises a hollow housing 150 mounted in the wall 156 forming pocket 132, a hollow sleeve 153 snapped into housing 150, and a metering orifice plate 152 secured in housing 150 by sleeve 153.

Abstract: A liquid content (fertilizer) metering apparatus comprising a sealed container having a pocket for supporting a pliable bag of liquid fertilizer which is metered into a restricted throat of a Venturi tube. Water from a relatively high-pressure line seeks a passageway into the container's pocket to pressurize the bag. With a lower pressure at the restricted throat, the liquid contents flow through a metered orifice or passageway to the throat, thus providing a predetermined mixture of water and contents that subsequently flows in a water flow conduit. Alternative embodiments include lid and bag assemblies as well as cartridge assemblies for the filled pliable bag, which facilitate handling, deposit and removal of the bags vis-a-vis the apparatus. One embodiment includes a valve having different sized metering orifices for the liquid contents.