Various essential nutrients have their own unique functions in the body, and their basic physiological functions are as follows.

(1) The basic materials and living materials that constitute objects are the basic substances that constitute objects, such as cellulose, hemicellulose, lignin and pectin. Living materials refer to the most active substances in the process of crop metabolism, such as amino acids, proteins, nucleic acids, lipids, chlorophyll and enzymes. These substances are all composed of carbon, hydrogen, oxygen, nitrogen, phosphorus, sulfur, calcium, iron and other elements.

(2) Most trace elements and potassium, calcium and magnesium play a catalytic role in the metabolism of the body, which can accelerate the metabolism in vivo. Most of these nutrients are the components of enzymes, such as molybdenum is an important component of the active part of nitrogenase, or activator of enzyme; for example, potassium is the activator of many enzymes.

(3) Potassium, calcium and magnesium are the active elements in the crops. They have special functions for crops in many aspects, which can regulate the permeability of cells and enhance the resistance of crops.

In short, no physiological and biochemical process in the crop can be completed by one element alone. Because of their special physiological functions and interactions, nutrients are responsible for various metabolism functions, which ensures the normal growth and development of crops.