The theory and policy of attaching importance to agriculture put forward in Shangnong are consistent with those of Shang Yang, Wu Qi and Han Fei, which shows that the emerging landlord class in the Warring States period at that time had realized the importance of developing production. This paper focuses on how to use political means to ensure that farmers can engage in agricultural production and labor in time, which is basically consistent with the principle of "not violating agricultural time" and the concept of taking agriculture as the foundation in the pre-Qin period.
Three articles, Ren Di, Bian Tu and Shi Shi, mainly recorded the agricultural knowledge in the Warring States Period: "Being rich means being rich, and being valuable;" : the living, the land; Those who raise it, the sky is also ",in the article" Judgement ",it is believed that crops are human, long in land and cultivated in heaven. Of the three, man is a subjective factor, but heaven and earth are important conditions. This article still remembers: "The cultivator's way is thick and valuable. "According to the review, the busy farming season is the most important for agricultural production. This view is also recorded in "Rendi": "Those who don't know things, go against it before they arrive, admire it before, and it was too thin at that time. "It means that the season has not arrived yet, and it is planted against time; The season has passed, and we will continue to be greedy; But it's just right, and it's not easy to farm. These all lost a good opportunity to farm. In addition, in this article, it is also recorded that "soil can make fertilizer and sting". It is pointed out that the soil can be changed, and the land can be turned into fertile and fertile land or barren and barren land. " "Benevolent land" is about the principle of land use, that is, sorting out, utilizing and improving the soil, conserving water through tillage, weeding and ventilation, so that crops can obtain sufficient nutrition in the early stage, which is beneficial to their growth, well-earing, full grouting, high grain quality and high yield.
The chapter "Identifying Soil" is about how to change the soil condition by manpower, that is, how to use the land. This paper gives a concrete answer to the questions raised in Ren Di. First of all, for different soils, it is required to make corresponding arrangements for farming time. This paper discusses three hazards caused by improper farming time: "stealing soil" (sowing too thinly), "stealing seedlings" (lack of seedlings) and "stealing grass" (weeds), and discusses the disadvantages caused by untimely farming and improper land preparation, which will have great influence on crops.
Four agricultural works, such as Shang Nong, are quite rich in content, summarizing the agricultural production experience of working people in the pre-Qin period in China, and containing rich agricultural dialectics, which shows that China's agricultural production theory and practice have been at the forefront of the world since the Warring States Period.