Yes, though current government grant funding is aimed at rooftop and irrigation reservoir-mounted solar rather than ground-mounted farm solar arrays.
In England, the main route has been the Improving Farm Productivity grant, which covers 25% of the capital cost for a wide range of solar equipment, administered by the Rural Payments Agency, with funding of between £15,000 and £100,000 available specifically for solar installations on rooftops and irrigation reservoirs.
The Farming Equipment and Technology Fund is a separate Defra scheme covering smaller, fixed-rate grants towards specific pieces of eligible equipment, including some solar-related items, and it runs in its own annual application window.
Grant rounds open and close periodically rather than staying open year-round, so it’s worth checking the current status on GOV.UK or speaking to an adviser before assuming funding will be available when you’re ready to install.