Champa rice

Timeline

1. 601–800Coastal rice paddies of Champa · ChampaChampa farmers selected rice strains with shorter growth cycles on monsoon climates and alluvial plains of mountains and rivers, adapting to double-cropping or drought-avoidance planting, forming early-maturing rice germplasm distinct from northern late rice, later called 'Champa rice' in historical records.
2. 801–900Farmland around the Champa capital Indrapura · ChampaIn the 9th century the Champa kingdom maintained rice production while contending with neighboring powers; early-maturing rice spread across coastal plains and river deltas, supporting population growth and grain exports in tributary trade, becoming an important regional variety in the Southeast Asian rice system.
3. 850–900Champa–Guangzhou sea route · South China SeaIn the late Tang period, envoys and merchant vessels traveled frequently between China and Champa; Champa rice may have been introduced by sea to trial plantings along the Fujian and Guangdong coasts (large-scale promotion came in the Northern Song). The 9th century was a gestation period for cross-border variety exchange, providing seed stock for China's later double-cropping reform.