Seapeak is specialized in manufacturing venturi injector.

How does venturi fertilizer injector work for drip irrigation system?
Venturi is commonly used for fertigation in irrigation. Irrigation venturi fertigation injectors are the most efficient and economical way to fertilize plants. They use the pressure differential between the the inlet and outlet ports to force water through a conical body, and draw a concentrated solution into a facult connect valve, and mix the fertilizer with water.

Specifications of Irrigation Venturi Fertilizer Injectors