The Zhongyufa 種芋法 "Methods of taro cultivation", also called Yujing 芋經 "The book of the taro", is a small agicultural treatise written by the Ming period 明 (1368-1644) scholar Huang Shengceng 黃省曾, courtesy name Huang Mianzhi 黃勉之, style Wuyue shanren 五嶽山人 (dates of life unclear). He came from Wuxian 吳縣, Jiangsu and obtained the juren degree during the Jiajing reign 嘉靖 (1522-1566). His book is divided into four chapters and quote extensively from ancient books, except the chapter Yifa 藝法 in which the author described contemporary methods of cultivating taro, as he observed it in his environment. The Zhongyufa or Yujing is included in the collectanea Mingshi xueshan 明世學山, Bailing xueshan 百陵學山, Yimen guangdu 夷門廣牘 and Shuofu 說郛.
Source: Li Xueqin 李學勤, Lü Wenyu 呂文鬰 (1996). Siku da cidian 四庫大辭典, vol. 2, p. 1649. Changchun: Jilin daxue chubanshe.