Were there any self-cultivated fields in ancient cities

Ancient China was founded on agriculture, and a large population gathered in cities, including an extravagant ruling class and a huge army, which consumed a lot of food and materials. Therefore, the needs of the urban population should be solved locally as much as possible, and whether or not the land was fertile and wide became the material basis for urban development. The poems "Gong Liu" and "Zhou Yuan" in the Book of Songs recount how the ancestors of the Zhou Dynasty chose their residence sites, and the verses "Yuxu Shi Yuan" and "Zhou Yuan" vividly depict the fertile land they found in Bin and Zhou Yuan. At the beginning of the Zhou Dynasty, they used to "divine and eat in Luoyi", and Zheng Xuan of the Eastern Han Dynasty said, "All the places they divined could be inhabited for a long time, so that they could serve each other and eat each other's food." Later, the ancients gradually formed the tradition of "measuring the land" and "recognizing the soil". Pipe - degree of land," said: "Therefore, the sages of the country, will not pour in the land, and choose the terrain of the fertile, countryside, mountains around, through the water, such as zephyr, ...... is to its natural materials, the birth of the ground, the benefits of raising their people, in order to educate the six animals." King Wu of Zhou operated Luoyi, not only from the situation of mountains and rivers, but also saw the vast plains of the Yiluo basin between Santu and Yueyi as a place suitable for the development of production. Guanzhong is even better, it not only has the mountains with rivers, four plugs of the fortress of the danger, but also between Bancheng and Longshu "800 miles of Qin River", very conducive to the operation of agriculture. The mountains around Guanzhong were also rich in mineral resources, gold, silver, copper and iron. During the Spring and Autumn Period, "the Jin people planned to go to the old Jiangjiang", i.e., they were ready to give up the old capital of Jiangjiang and plan for a new one. They examined and compared the former land and Xintian, and thought that although the former was "fertile and near salt, and the country was favorable to the king," but "the soil was thin and the water was shallow, and its evil was easy to construct," and "it was not as good as Xintian, which had thick soil and deep water, and did not have any trouble in living there. Fen, Hwoe to flow its evil". Therefore, Duke Jing of Jin abandoned the former land of the Shimchao clan and moved the capital to Xintian. Through the above passage, we can determine that there is no field in the ancient city, a city is only how big ah not as good as the use of the sky to operate the agriculture