How did sumerians know if they had a stable food supply?

The Sumerians assessed their food supply stability through several indicators, such as crop yields and the consistency of harvests. They monitored weather patterns and irrigation effectiveness, which were crucial for agriculture in the arid region. Additionally, they kept records of grain storage and trade, allowing them to gauge food availability and plan for periods of scarcity. Overall, a combination of observation, record-keeping, and agricultural practices helped them ensure a stable food supply.