The Julu 橘錄, also called Yongjia julu 永嘉桔錄 "Tangerines of Yongjia", is a book on tangerines and oranges written by the Song period 宋 (960-1279) scholar Han Yanzhi 韓彥直 (jinshi degree 1148). Han Yanzhi climbed up the ladder of official career up to the post of Minister of Works and Grand Master of Splendid Happiness (guanglu dafu 光祿大夫). He died in high honours as Commandery Duke of Qichun 蘄春郡公. Han Yanzhi has also written the large book Xinshuijing 水心鏡. The 3 juan "scrolls" long Julu was written when has was prefect of Wenzhou 溫州, Zhejiang. Yongjia, as it appears in one title, is another name for Wenzhou. In his preface, dating to 1178, he explained the reason why he wrote a book on tangerines during that time. The first chapter includes a detailed description of appearance, colours and taste of eight kinds of mandarin oranges (gan 柑) and one kind of orange (cheng 橙), of which the nishanru 泥山乳 is rated the best. The middle chapter describes 18 kinds of yellow tangerines (huangju 黃橘), the last chapter is dedicated to the cultivation and use of these kinds of citrus fruits, like hybridization, planting, raising, protecting from diseases, watering, plucking, storing and treatment of the fruits, and how to use them as food or medicine.
The Julu is included in the collectanea Baichuan xuehai 百川學海, Shuofu 說郛, Han-Wei congshu 漢魏叢書 and Siku quanshu 四庫全書.
Source: Li Xueqin 李學勤, Lü Wenyu 呂文鬰 (1996). Siku da cidian 四庫大辭典, vol. 2, p. 1866. Changchun: Jilin daxue chubanshe.