Irrigation farming allowed for the cultivation of crops in areas that would otherwise be too dry to support agriculture. This led to increased food production, which in turn led to population growth and the development of civilizations. Irrigation also allowed for the development of more complex agricultural systems, such as crop rotation and the use of fertilizers. These advances in agricultural technology led to increased productivity and efficiency, which allowed farmers to produce more food with less effort.
In contrast, hunter-gatherers were nomadic people who relied on hunting and gathering wild plants for food. They had to constantly move from place to place in order to find food, and their diet was often limited by the availability of resources. Irrigation farming allowed for a more settled lifestyle and a more diverse diet.