This is the fourth in a series of volumes repporting on the material recovered from the excavation of the prehistoric site of Khok Phanom Di. The author worked throughout on the recovery of botanical remains. Most came from the flotation of soil samples taken from all cultural contexts, but such were the conditions for preservation, that wood, charcoal. rice and possible fabric remains were also found. The interpretation is enhanced through a consideration of traditional harvesting and crop processing techniques creating a picture of a dynamic and changing environment in which the cultivation of domestic rice was undertaken.