> without disturbing farm land

Farm land is heavily disturbed. All the fertilizer and other chemicals used, soil destroyed by all the things we do to it, and downstream disruption due to fertilizer runoff, animals that are fed and then we have to manage the manure, water that is depleted etc. Placing solar panels on farm land is actually very close to returning it to the nature (of course depending on how exactly you do it, how tightly placed they are, how high etc., but it's also possible to still grow trees under them like some pilot projects in southern Italy or to place them over animal pastures).