There are a lot of places where solar panels can increase yield for specific plants by providing a shade. They also can generate electricity to run electrical pumps for targeted irrigation saving a lot of water.

Ya, but that isnt as widespread as fields being rededicated from crops generally to solar exclusively. And mixed use doesnt mesh well in a world of crop rotation and crop-specific harvesting equipment. I have yet to see a combine that can drive over solar panels without touching them.