This building serves as a granary and as a storehouse for machinery and tools that are used on the farm. A carpentum, a vallus, a threshing-board called a tribulum, and an improved version called a Punic cart (plostellum punicum) are used in harvesting and threshing the grain. Among the many hand tools are the scythe (falx), hoe (marra/ sarculum), hatchet (securis/ ascia), pick-axe (dolabra), and spade (pala). We also store those open-ended winnowing baskets (ventilabra) here, but the plow (ard) and the yoke (iugum) for the oxen are in the byre.
Here are a few details about planting, harvesting, threshing, and winnowing the grain.
An illustrated article describes the methods and implements of grain production and processing at Karanis in Roman Egypt.
Another illustrated article by Petr Chuksin entitled History of Gallic Reaper describes the first grain-harvesting combine in agricultural history.
Some of the preceding information comes from Handbook to Life in Ancient Rome, written by Lesley Adkins and Roy A. Adkins and published in1994 by The Oxford University Press (New York).