What social customs did the national wind, imperial wind and July reflect in ancient times?

"Guo Feng, Qi Feng, July" is the longest poem in The Book of Songs Guo Feng. The Preface to the Collection of Poems by Mao Zedong thinks that its theme is "Chen Hou Ji, the reason why corruption is difficult"; Chen Huan's Biography of Shi Mao's Poems is regarded as "the Duke of Zhou was influenced by the change of his managerial talents", which is far apart and seems unbelievable. "History of Han Geography" said: "In the past, Hou Ji was knighted (lí), Gong Liu was knighted, Qi Wang moved to Qi, Wen Wang was knighted, and Wu Wang ruled the axe. Its people inherited the legacy of the former king. They are good at farming and working. Therefore, the poem says that Nong Sang has done a good job of food and clothing. " Accordingly, this paper is considered to be the early Western Zhou Dynasty, that is, the period when Gong stayed in prison. In Xunyi and Binxian, Shaanxi Province, the ancestors of the Zhou Dynasty in Gongliu era were still an agricultural tribe. July reflects the working life of this tribe all year round, involving all aspects of food, clothing, housing and transportation. Its author is a member of the tribe, so the style is cold and the angle is extremely accurate. It shows the genre painting of the society at that time from all aspects, as Yao Jiheng said in "The Book of Songs": "Birds sing and insects sing, like" The Moon Order "; When a woman enters the room, Mao Mao rises to the room, which is like a customized book; Fire and cold wind, like "five elements"; Caring for and caring for young people, Tang Ji said, is like a ceremony; Celestial officials dye their posts, hunt and store ice and sacrifice to the palace, just like credentials. Among them, there are mulberry picking maps, family music maps, recipes, cereal maps and wine classics: all in one poem, the best in the world! " Every year, spring ploughing, autumn harvest, winter storage, mulberry picking, dyeing, sewing, hunting, building houses, brewing, labor and feasting are all written. The comment that "beauty is achieved without preparation, and the poems of Tao, Xie, Wang, Meng, Wei and Liu Tian after the Jin and Tang Dynasties have never reached this level" (ibid.) is basically in line with the reality in the poems. The poem was written in July, and each painting is unfolded month by month in the order of farming activities. It must be noted that the weekly calendar is used in the poem. The first month of the week calendar is November of the summer calendar (now called lunar calendar), and July, August, September, October, April, May and June are the same as the summer calendar. The first, second, third and fourth days are November, December, January and February in the summer calendar. "Silkworm Moon" is March in the summer calendar. Pi's "General Theory of Confucian Classics" says: "In this poem, all the people in the moon are in summer, and the first, second, third and fourth days are in the week. Change its name without changing it. " Dai Zhen's textual research on Mao Zheng's poems also pointed out that although Zhou was changed to Zhou Zheng (taking November of the lunar calendar as the first day of the first month), folk farming still used the summer calendar. These statements are an important basis for readers to understand the time sequence of this poem.