Agricultural spread

 During this period, agriculture developed independently in the east, with rice as the main crop rather than wheat. Chinese and Indonesian farmers domesticated tubers and beans, including mung, choi and azuki. As net fishing in rivers, lakes, and beaches met a large demand for food, new agricultural systems and fishing slowed down all previous expansions and led to an increase in human population that continues today. By 5000 BC, the Sumerians developed centralized agricultural techniques using intensive tillage, systematic irrigation, and specialized labor, especially around the Saat al-Arab waterway in the Persian Gulf, where the present-day Tigris and Euphrates rivers meet. The Greeks and Romans used the techniques developed by the Sumerians, making only some basic improvements. The southern Greeks were struggling with very poor soil, and it took many years for their social system to develop. The Romans placed great importance on cultivation for sale

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