Soybean wheel as a propaganda slogan

Among the rhizobia of leguminous plants, there are rhizobia and leguminous plants that can fix nitrogen. Rhizobia can fix nitrogen and transform nitrogen in the air into nitrogen-containing substances that plants can absorb, while plants provide organic matter for rhizobia. They are mutually beneficial and live together. Therefore, wheat and soybean rotation are often used in agricultural production.

Wheat is a monocotyledonous plant and a gramineous plant widely cultivated all over the world. Wheat caryopsis is one of the staple foods of human beings.