Three ploughing and one ploughing mostly came from the period of War of Resistance against Japanese Aggression. Farming for more than three years means farming for three years and saving grain for a year. During the period of War of Resistance against Japanese Aggression, some people's governments in the border areas under the leadership of China's * * * Production Party put forward the slogan of "three more and one harvest" in the mass production movement, calling on farmers to actively produce and practice strict economy, so that each family could have four months' surplus grain a year.

Whole grains refer to all kinds of plant seeds in cooking food, which can also be called "five grains". Food crops are rich in nutrients, mainly protein, vitamins, dietary fiber, fat and so on. In ancient times, people used to eat in the street. Later, it was also called raw grain and finished grain such as cereals, beans and potatoes. The food concept of the Food and Agriculture Organization of the United Nations (hereinafter referred to as FAO) refers to cereals, including wheat, beans, coarse grains and rice.