In what form are the inorganic salts needed by plants absorbed

Roots can absorb minerals from the soil solution, as well as minerals that are adsorbed by soil particles.

The roots absorb the minerals in the solution through the following steps:1Ions adsorbed on the cell surface of roots2

Ions enter the inside of the root (ions enter from the root surface, just as water enters the root, through both the apoplast and coplast pathways). When ions tap on the endothelium, the Kjeldahl band of the endothelial layer prevents ions from diffusing from the apoplast back to the root cortex, so the Kjeldahl band keeps the xylem at a higher ion concentration than the external solution. Ions can only enter the midcolumn through the coplast pathway, and finally the ions diffuse through the apoplast to the ducts or tracheids.

The absorption of mineral elements adsorbed by soil particles by the roots: the surface of the soil particles is negatively charged, adsorbing mineral cations, which are not easily washed away by water, and they exchange with the cations in the soil solution through cation exchange. The mineral anion is repelled by the negative charge on the surface of the soil particles, dissolved in the soil solution, and is easy to lose.

Hydrogen ions and bicarbonate ions are distributed on the surface of the roots, and the same mineral cations and anions on the surface of the soil particles are exchanged with the hydrogen ions and bicarbonate ions on the surface of the roots, respectively, and enter the roots.

Absorbed in the form of ions by active transport.

In a general sense, living organisms are inseparable from water, and inorganic salts balance the concentration of biological fluids, and different inorganic salts have different effects in different tissues and organs.

Plants absorb water by transpiration, that is, the leaves are evaporating water, and the water in the upper layer of the plant is relatively small, and the water is infiltrated from the soil by osmotic pressure into the roots and then to the leaves.

Plants absorb inorganic salts by osmosis, that is, when the concentration of inorganic salts in the soil is greater than the concentration of inorganic salts in the root cell sap, they can enter the plant roots through osmosis, and then be transported to the whole plant body by the plant roots through body fluid transport.

The most inorganic salts required during plant growth are nitrogen, phosphorus, and potassium.

They are indispensable substances in the growth process of plants. Nitrogen promotes plant growth and is the basis of genetic material. Phosphorus is mainly found in seeds, which can participate in photosynthesis, respiration, as well as energy transfer and storage, and potassium acts on the process of metabolism.

Nitrogen, phosphorus and potassium inorganic salts are indispensable in the growth process of plants, they can maintain normal life activities and ensure plant growth and maturity. Nitrogen-containing sodium precosm is an important component of organic compounds in plants, and is also the basis of genetic material, which is an important factor in controlling the growth and quantity of plants.

Potassium-containing substances are mainly present in the sap of plants through the free state of ions, which plays an important role in the process of metabolism and is also conducive to the formation of xylem. Phosphorus-containing substances are mainly found in seeds and are often involved in photosynthesis, respiration, energy storage and transmission, and cell differentiation.

The extended information is as follows:

Due to the effective absorption capacity of plants for inorganic salts, it is necessary to go through fermentation or dilution to reduce the concentration of inorganic salts and avoid fertilizer damage before applying nutrients. When adding too much inorganic salt, it is necessary to water it with water or repot it to avoid damage to the root system.

When applying inorganic salts, they should be added to the surface of the soil to avoid splashing on the leaves of the plants, which will cause burns, cause damage to the leaves, and affect growth. Nitrogen and phosphorus fertilizers are usually applied during the period of vigorous growth, and phosphorus and potassium compound fertilizers are applied during the fruiting period, and a small amount of urea can also be added.

Inorganic salts play an important role in the growth and development of plants, including nitrogen, phosphorus, potassium, calcium, magnesium, sulfur, boron, manganese, zinc, molybdenum and other inorganic salts.

Plants require very little inorganic salts, but they also play an important role in the life of plants. For example, if there is a lack of inorganic salts containing iron, fruit trees will get yellow leaf disease; Without boron-containing inorganic salts, rape will "flower but not fruit" (only flowering but not fruiting).

The cell sap concentration in the roots is high, which forms osmotic pressure with the moisture of the external soil.

This causes water and the inorganic salts dissolved in water to flow to the root cells, and is absorbed in ionic form because it is in the form of dissolution. If the mineral salt is insoluble, it cannot be absorbed.

Such as sodium chloride. For inorganic salts. It is ionized into Na ions and Cl ions after being dissolved into water. Then, the root must absorb anions at the same time.

and cations. There is still a mutual attraction after ionization, and if the absorption process is not balanced, it will lead to an imbalance of charge, which will force the ions to flow to the corresponding desired place to reach the charge balance, so it is conceivable that the sodium ions will not necessarily combine with the original chloride ions.