Police have launched an appeal for witnesses to a road traffic collision that occurred on Saturday morning on the A947 Fyvie to Oldmeldrum road at the Bethelnie junction.
The collision involved a black Suzuki motorcycle and grey tractor towing a blue trailer.
The 50-year-old male rider of the motorcycle was seriously injured and was airlifted to Aberdeen Royal Infirmary. The tractor driver was uninjured.
The road was closed for six hours while Police carried out their investigations.
Sergeant Colin Matheson of the Road Policing Department said: "We have already spoken to several witnesses, however, I would like to ask anyone who witnessed the collision and has not yet spoken with us to please get in touch by calling 101 quoting incident number 1401 of 24 February 2018".