Written by Xu Guangqi in Ming Dynasty. Guangqi has Six Poems of the Book of Songs, which has been recorded. It's a collection of farmers' books, a set. The three volumes of agricultural books are all books about civil affairs written by hundreds of historians, and finally they are all based on the agricultural code of the Ming Dynasty. The second field system consists of two volumes, one is the mine, and the other is the system of past dynasties. "Second Tillage", "Self-operated Reclamation" and "Waiting for Time" are all contained in six volumes. Nine volumes of water conservancy, recording the situation in the north and south, and maps of various emitters. The last six volumes are Tessie Water Law. Investigating the biography of Guangqi in Ming Dynasty, Guangqi learned from Matteo Ricci, a westerner, how to calculate firearms by astronomical calendar. In the first year of Chongzhen, he also studied the new law almanac with westerners Long Huamin, Deng and giacomo Luo. So he can get all his skilled skills and write books. Followed by four volumes of farm tools, all with detailed paintings, which are different from Wang Zhen's books. Followed by six volumes of tree art, divided into valley, preserved fruit, vegetables and fruits. The second is four volumes of sericulture, and the silkworm is fixed. According to Records of History of the Ming Dynasty, he is eager to learn and can write ci and fu, which is estimated to be able to help more than 400 kinds of hungry people, with a vast territory and disregard for human life, as shown in the figure. Li Shizhen's Compendium of Materia Medica was written by Hong and Puji Fang. Kao Xian-wang was stewed when he succeeded to the throne in the early years of Injong, and his statement was extremely wrong. It was edited and reprinted by Lu Dong of Jiajing Mao Yi. Each volume is divided into four volumes. There are 0/38 kinds of old materia medica/KLOC-and 276 kinds of new materia medica, all of which have been examined and approved in detail. There is an oriental preface before it, also known as Zhou Xianwang. Gaisang and Guanglei, Volume II. People have a wide range, and kapok and ramie belong to the same genus. The second is to plant four volumes, all of which are trees. The second time is to raise a roll, but also to raise fish and keep bees. The second is to make a roll of food that is often needed. The second part is eighteen volumes of Famine, the first three volumes are famine preparedness, the fourteenth volume is famine relief materia medica, and the last volume is wild prescription, which is also attached. Standing at the end of the book, covering seasonal, agricultural nursery, water conservancy, famine relief, interlocking, integrated. Although it is taken from various books, it is particularly complete if it is different from other books. "History of Ming Dynasty" said that Guangqi compiled and repaired military aircraft, wasteland and salt. Water conservancy books, also known as negative economic talents, are interested in using the world, which is also slightly seen in this book.