Hampshire fire and rescue Crews from Winchester, Eastleigh and Andover are dealing with approx 40 tonnes of straw alight in Sparsholt.
A water carrier from Winchester has also been mobilised to the incident.
The firefighters were called to Woodman Lane at around 7.20pm, and worked until 8.28am this morning.
A spokesman from Hampshire Fire and Rescue said: “The crews used three main water jets, foam and water carriers.”
This is two heavily resources incident currently on going within the Hampshire surrounds.