This C-130 was photographed on approach to Ellington Field (EFD), Texas.
What are the protruding, truss-supported bars aft of and below the wing?
There's an airshow coming up in ~3 weeks at EFD, so it may have something to do with that, especially considering the fancy underwing paint job.
It is a civilian owned C-130 Hercules used for aerial spraying operations. It is owned by the International Air Response company based out of Mesa, AZ.
The aircraft is equipped with a RIDSS spray system for use in things like oil spill response (for spraying dispersants). You can read more about the system here.