Re: Farmers think different
"Solar won't cut it unless there are several hectares of panels which removes that amount of ground from crop production."
You're overthinking it in one direction and underthinking in another.
Greenhouses have a major problem with excess heat (which can be used by a water pump) and can be used to grow high value crops with far lower levels of pesticides/herbicides used thanks to being enclosed, if the heat is removed. There are a number of schemes doing this around the world.
100m^2 of shed roof will drive a 10kW water pump quite happily anyway.