Police are appealing for information about a burglary at Crowders Garden Centre in Horncastle.
The incident happened between 5pm and 8pm on Thursday August 20 on the Crowders site on the eastern side of the A158 (opposite to the main garden centre).
The offenders gained entry to the site by forcing the main gate and then broke into a building and shed.
The burglars stole approx 600 litres of diesel from a tank, together with a small Massey Ferguson 1220 tractor.
Police are looking for any witnesses, especially motorists driving past the site yesterday afternoon/evening, who may have seen any suspicious activity at the site.
Anyone with information should contact Lincolnshire Police by dialling 101 and quoting the incident number. Report crimes anonymously by contacting Crimestoppers on 0800 555 111.