Underground fertilizing system for irrigation system

An system for distributing liquid agricultural products, comprising:

• a first controller for controlling the system;
• a first irrigation system for supplying water to an agricultural area, the first irrigation system comprising:
• a first plurality of valves;
• a first plurality of sprinkler heads;
• and
• a first set of pipes for placing the first valves into fluid communication with the first sprinkler heads;
• a second irrigation system for supplying at least one liquid agricultural product to the agricultural area, the second irrigation system comprising:
• a second plurality of valves;
• a second plurality of sprinkler heads;
• and
• a second set of pipes for placing the second valves into fluid communication with the second sprinkler heads;
• and
• a storage tank partially located underground, the storage tank being in fluid connection with the second irrigation system via a one-way valve, the storage tank being configured for storing and supplying the at least one liquid agricultural product to the second irrigation system;
• wherein the second set of pipes are isolated from the first set of pipes via a three-way valve, such that the at least one liquid agricultural product in the second set of pipes cannot mix with the water in the first set of pipes.