The bulk density of wheat is measured by the volume of one cubic meter, which does not represent the weight of one cubic meter, but the peripheral gap of the container size is different, and there is no standard answer. According to the classification and index of wheat quality formulated by the state, it is divided into five grades according to bulk density. The first-class wheat is over 790 kg, the second-class wheat is 770 kg, the third-class wheat is 750 kg, the fourth-class wheat is 730 kg, and the fifth-class wheat is 7 10 kg, while the wheat below the fifth-class wheat is usually called foreign wheat.
Wheat is one of the three major cereals, almost all of which can be eaten, and only about one-sixth of which is used as feed. The two river basins are the earliest areas for growing wheat in the world, and China is one of the earliest countries for growing wheat in the world.