ARSONISTS made a repeat attack at a field in Church Gate, Whaplode, on Thursday night be setting alight 80 tonnes of baled straw.
Five days earlier the same field was targeted and 15 tonnes of straw went up in smoke.
Firefighters were alerted shortly before 7.40pm on Thursday and remained at the scene overnight to ensure the fire burnt out safely.
Police and Lincolnshire Fire and Rescue are investigating a series of similar arson cases.
Fire and Rescue arson task force manager Steve Wright said: “We can and do prosecute people.”