Covering roughly the area of modern south Shaanxi of China, the southern Loess Plateau emerged as a core region in the development of Bronze to early Iron Age agricultural technology and culture. The introduction of wheat was a significant turning point in this process, increasing land under cultivation and dietary complexity. To date, specific management practices and adaptation strategies concerning wheat cultivation remain poorly understood. This study employs stable carbon and nitrogen isotope analysis of charred wheat remains from the Zhouyuan (周原) and Yucun (遇村) sites in order to reconstruct farmland management practices across three significant historical phases covering the period 3200–2000 BP: the proto-Zhou, late Western Zhou-Spring and Autumn, and Qin-Han eras. The results indicate asynchronous changes in Δ13C (plant-CO2) and δ15N values of wheat seeds at Zhouyuan and Yucun across each period. Zhouyuan gradually exhibited improved water supply and fertilization conditions compared to Yucun. This reflects differences in farming strategies and levels and localized intensity of investment in complex agriculture. These findings reveal the impact of irrigation infrastructure development on early Chinese agricultural growth, as well as highlighting the adaptability of ancient societies on the Loess Plateau.
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