It is the Polish PZL M-15, as you can read in the image if you zoom in. From Wikipedia:
The aircraft was designed in Poland in response to a Soviet
requirement for a new agricultural plane.
Agricultural airplanes fly slow and having a shorter span increases the number of (air)fields you can land on. That's probably why they decided using a biplane design.
The two tanks outside the fuselage could have several reasons:
- Placing the chemicals further away from the turbine and pilot
- Reduce the bending moment at the wing root
- Shorter pipes between the tank and the spray nozzles
All this, of course, at the cost of a lot of drag. As explained in the image source page, fuel consumption was three times larger than other agricultural airplanes and it had a really bad maneuverability.
The jet engine was a requirement dictated by Aeroflot, who wanted to use the same type of fuel for their passenger and agricultural airplanes.