De Agri Cultura (Latin pronunciation: [ˈdeː ˈaɡriː kʊlˈtuːraː], On Farming or On Agriculture), written by Cato the Elder, is the oldest surviving work of Latin prose. Alexander Hugh McDonald, in his article for the Oxford Classical Dictionary, dated this essay's composition to about 160 BC and noted that "for all of its lack of form, its details of old custom and superstition, and its archaic tone, it was an up-to-date directed from his own knowledge and experience to the new capitalistic farming." Cato was revered by many later authors for his practical attitudes, his natural stoicism and his tight, lucid prose. He is much quoted by Pliny the Elder, for example, in his Naturalis Historia.
The work of Cato is often characterized as a "farmer's notebook" written in a "random fashion"; it is hard to think of it as literature. The book seems to be no more than a manual of husbandry intended for friends and neighbours. Its direct style, however, was noted by other ancient authors like Aulus Gellius as "forceful and vigorous", in a context of extreme simplicity. Perhaps the main achievement of De Agri Cultura is its depiction of rural life during the Roman Republic.
Cato's introduction compares farming with other common activities of that time, specifically commerce and usury. He criticizes both, the former on the basis of the dangers and uncertainty which it bears, the second because according to the Twelve Tables, the usurer is judged a worse criminal than a thief. Cato makes a strong contrast with farming, which he praises as the source of good citizens and soldiers, of both wealth and high moral values.
De Agri Cultura contains much information on the creation and caring of vineyards, including information on the slaves who helped maintain them. After numerous landowners in Rome read Cato's prose during this time, Rome began to produce wine on a large scale. Many of the new vineyards were sixty acres, and because of their large size, even more slaves were necessary to keep the production of wine running smoothly.