Apparatus for dissolving and dispensing fertilizer to either of two water streams of different pressure

Apparatus for introducing a preselected quantity of soluble fertilizer alternatively into either a first relatively high pressure water stream or a second relatively low pressure water stream in a fully dissolved state, said apparatus comprising:

• a tank;
• a porous receptacle disposed within the tank and adapted to receive the quantity of soluble fertilizer therein, the bottom of said receptacle being spaced upwardly from the bottom of said tank to provide a plenum volume beneath the receptacle at the bottom of the tank;
• a sprinkler head superimposed over the soluble fertilizer in the porous receptacle;
• a water supply pipe connected between the second water stream and the sprinkler head for dispensing water in a dispersed state onto the soluble fertilizer in the porous receptacle so that the dispensed water dissolves the fertilizer and passes through the porous receptacle to collect in the plenum volume at the bottom of the tank;
• a filter lining in the inner surface of the porous receptacle to prevent passage of undissolved fertilizer through said receptacle;
• a float located in the plenum volume to indicate the level of the water containing the dissolved fertilizer at the bottom of the tank;
• valve means including a valve interposed in the water supply pipe and means connecting the valve to the float so that the flow of water through the water supply pipe to the sprinkler head is interrupted when the float approaches the bottom of the porous receptacle;
• an outlet manifold having an inlet and a first outlet which is connectable to said first water stream and a second outlet which is connectable to said second water stream whereby the water containing the dissolved fertilizer can be alternatively supplied to either water stream;
• an outlet pipe having one end connected to the tank at the plenum volume and a second opposite end connected to the inlet of said outlet manifold;
• a pump interposed in the outlet pipe and adapted to force the water containing the dissolved fertilizer through said outlet pipe;
• and
• means connected to the outlet pipe upstream of the pump for draining the plenum volume when the apparatus is not in use.