Automatic controller for injection of additives into irrigation water

An injection control system for selectively activating circuitry to control additive chemical injection into an existing automatically timed irrigation system having an irrigation timer comprising;

• a plurality of storage means for storing one or more additives;
• conduit means for delivering an additive from said plurality of storage means to conduit in said existing irrigation system;
• a plurality of electrically activated valve means in said conduit means for delivering one or more of said additives selectively to said existing irrigation system;
• injection control means for selectively controlling simultaneous injection one or more of said one or more additives from said plurality of storage means into said conduit means for mixing with water flowing through said existing irrigation system;
• sensing means in said injection control means for sensing the opening and closing of valves in an existing irrigation system;
• said injection control means including programmable central processing means programmed to read, count, and store in memory valve opening signals of said existing irrigation system;
• said programmable central processing means programmed to control operation of said electrically activated valve means and said injection control means to control activation, duration and cessation of additive injected into said existing irrigation during its operation;
• whereby said injection control system controls the amount and duration of additive supplied to one or more fields during operation of an existing irrigation system.