The Sumerians grew barley, chickpeas, lentils, millet, wheat, turnips, dates, onions, garlic, lettuce, leeks and mustard. They also raised cattle, sheep, goats, and pigs. They used oxen as their primary beasts of burden and donkeys as their primary transport animal. Sumerians hunted fish and fowl.

Sumerian agriculture depended heavily on irrigation. The irrigation was accomplished by the use of shadufs, canals, channels, dykes, weirs, and reservoirs. The canals required frequent repair and continual removal of silt. The government required individuals to work on the canals, although the rich were able to exempt themselves.

Using the canals, farmers would flood their fields and then drain the water. Next they let oxen stomp the ground and kill weeds. They then dragged the fields with pickaxes. After drying, they plowed, harrowed, raked thrice, and pulverized with a mattock.Sumerians harvested during the dry fall season in three-person teams consisting of a reaper, a binder, and a sheaf arranger. The farmers would use threshing wagons to separate the cereal heads from the stalks and then use threshing sleds to disengage the grain. They then winnowed the grain/chaff mixture.

Early in Sumerian civilization, eighty to ninety percent of those who farmed did so on land they considered theirs rather than communal property. Here, too, the Sumerians were expressing a trend that was common among others. Another individual effort was commerce, and with a growth in commerce the Sumerians had begun using money, which made individual wealth more easily measured and stored. Commerce required initiative, imagination, an ability to get along with people and luck, and, of course, some merchants were more successful than were others. Farming took stamina, strength, good health, good luck and organization. And some farmers were more successful than were other farmers.

Those farmers who failed to harvest enough to keep themselves in food and seed borrowed from those who had wealth in surplus. Those who borrowed hoped that their next harvest would give them the surplus they needed to repay their loan. But if the next harvest were also inadequate, to meet their obligations they might be forced to surrender their lands to the lender or to work for him. When Sumerians lost their land, they or their descendants might become sharecroppers: working the lands of successful landowners in exchange for giving the landowners a good portion of the crops they grew.

Accompanying divisions in wealth was a division in power, and power among the Sumerians passed to an elite. Sumerian priests who had once worked the fields alongside others, soon were separated from commoners. A corporation run by priests became the greatest landowners among the Sumerians. The priests hired the poor to work their land and claimed that land was really owned by the gods. Priests had become skilled as scribes, and in some cities they sat with the city's council of elders. These councils wielded great influence, sometimes in conflict with a city's king.