What are the main physiological effects of medium nutrient elements on plant growth and development?

What are the main physiological effects of medium nutrient elements on plant growth and development?
The essential medium nutrients for plants include three kinds of calcium, magnesium and sulfur. They also play an important physiological role in plant growth and development. The brief description is as follows:
(1) Calcium-calcium is an important component of the plasma membrane and prevents extravasation of cells and premature aging. Role: Calcium is an indispensable material for the cell wall. Calcium deficiency affects the division of cells and the formation of new cells; Calcium is the activator of certain enzymes, such as amylase; Calcium has functions of neutralizing acid and detoxification, such as the formation of calcium oxalate, which is very important for cell osmotic regulation. .
(2) Magnesium and magnesium are components of chlorophyll. In the absence of magnesium, plant synthesis of chlorophyll is hindered; magnesium is an activator of many enzymes in the process of sugar metabolism; magnesium can promote the operation of phosphate in the body; it participates in the metabolism of fat and promotes vitamin A And vitamin C synthesis.
(3) Sulfur contains sulfur in three amino acids, so it is a protein component. In the absence of sulfur, protein formation is hindered; in some enzymes it also contains sulfur, such as lipase, urease are sulfur-containing enzymes; sulfur can increase nitrogen fixation efficiency of legumes; sulfur participates in the redox process of plants; sulfur on chlorophyll The formation has a certain influence.
With the development of agricultural production and the continuous increase in the yield of crops, the demand for medium amount of nutrients by plants is increasing. Due to the increase in the application of high concentrations of elemental phosphorus fertilizers and compound fertilizers, the lack of moderate nutrient symptoms has been observed in some areas and in certain crops. Therefore, the application of fertilizers containing calcium, magnesium, and sulfur is necessary to increase crop yields.

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