How do these poems describe the Five Dynasties?

During the Five Dynasties when the warlords were independent, agricultural production in some areas of China, such as wuyue and Nantang, was still developed because there were fewer wars and the people's corvee and tax burden were lighter. After the Northern Song Dynasty unified the whole country, farmers got a relatively stable environment to engage in productive labor, and the national agricultural production quickly recovered. The imperial court also took some measures to reduce taxes, which was beneficial to the development of agricultural production. The feudal economy in the Northern Song Dynasty was characterized by the economic exploitation of farmers by landlords based on the contractual relationship between landlords and customers. In addition to the amount of rent stipulated in the contract, the customer's personal attachment to the landlord is weaker than that of the farmers in the Tang Dynasty who implemented the land equalization system. After buying a small amount of land, customers can also leave the landlord and set up their own accounts. These changes have somewhat improved farmers' interest in production. With the improvement of farm tools and the popularization of "covering rice", not only a large number of wasteland was opened up in China at that time, but also the yield per unit area of crops was improved. These poems vividly describe the cultivation of large-scale cultivated land and the intensive cultivation of farmers at that time, such as "Wheat travels thousands of miles without seeing the soil, even the mountains are cloudless" (Wang Anshi's "After Yuan Fengxing"), "Spring rain makes Luowan tired, and Xia Feng makes cakes fragrant" (Su Shi's "South Garden").