Uckfield and Heathfield firefighters used a water carrier and set up a 12,000 litre dam in a stable yard when tackling a fire at a farm in Isfield on Tuesday.
East Sussex Fire and Rescue Service said a large dung heap was well alight and threatened adjacent hedgerows and woodland. It took more than six hours to put the fire out.
The site was difficult to access and as the nearest hydrant was a considerable distance away the crews used a water carrier and set up the 12,000 litre dam in the stable yard for a Landrover to refill.
Safety advice for farmers
The fire service has since issued generic fire safety advice to farmers which includes removing hay and straw from a field as soon as possible after harvesting.
It recommends storing hay and straw separately from other buildings, in stacks of reasonable size and separately from livestock housing.
Petrol, diesel and other fuels should be stored in secure areas and storage tank outlets should be padlocked.
Fertilisers and pesticides should be kept under lock and key and refuse should be disposed of safely and on a regular basis.
Unoccupied areas should be regularly checked to ensure they are safe and secure and there is no unnecessary accumulation of combustible materials.