whom his supposed Tang progenitor was. Johannes L. Kurz concluded that the more reliable sources state his ancestor was either son or a younger brother of Xuanzong. On 2 May 939 Li Bian performed the traditional sacrifices to Heaven. Jingnan and Wuyue sent ambassadors praising this event. Li Bian encouraged the bureaucratization of his court, taking power away from military officers. The constant turmoil of the Central Plains created a pool of experienced émigré officials that relocated to the more stable south. Li Bian was in particular interested in men versed in Confucian rituals. Ma Ling (馬令) reported that the civilian government maintained by Li Bian "was humane and attracted men from far and near." Among these recruits was Han Xizai, who rose in prominence during the reign of Li Jing. The question of succession arose near the end of Li Bian's reign. He preferred his second son Li Jingda. However, his oldest son Li Jing was eventually picked as his heir. In 943 Li Bian died and Li Jing succeeded his father. Economy The Southern Tang and its neighbors were relatively prosperous compared to regimes successively in control of the Central Plains. The greater agricultural productivity of the region created favorable conditions. Consistent tax revenues were secured with the growing disposable income of the populous. Interstate trading of specialized crafts like colored silks and salt reclaimed from the Huai River likewise was promoted by the Southern Tang. Agricultural practices along the lower Yangtze River had undergone major modifications in the final years of the Tang dynasty. Irrigation and water management systems were more complex than in previous years. Intensive cultivation of rice was conducted in lowlands and adjacent reclaimed areas from waterways. Silk production developed into a regional cottage industry as farmers planted mulberry trees alongside their cereal crop. Meanwhile, in nearby piedmont areas agriculturalists became specialized in growing tea or textile plants like hemp (麻) or ramie (苧). These practices were in efflorescence during the Southern Tang, which created the most developed agricultural economy among the southern states. Rice farmers had better yields and in general had more disposable income than their predecessors. This led to more state revenue by taxes on cereal and cash crops. Li Bian pursued the economic development of his realm through a number of fiscal policies. Song Qiqiu drafted many initiatives that focused on tax reform that were implemented. According to Sima Guang