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Agricultural Chemistry
Ion Uptake Mechanism (2 Theories)
Agricultural Chemistry

Ion Uptake Mechanism (2 Theories)

Agriculturist Musa June 7, 2018

Contents

  • 1 Ion Uptake Mechanism (Contact exchange theory, CO2 exchange theory)
    • 1.1 Ion Uptake Theory
      • 1.1.1 1. Contact exchange theory
      • 1.1.2 2. CO2 exchange theory

Ion Uptake Mechanism (Contact exchange theory, CO2 exchange theory)

Ion Uptake Theory

Scientists have postulated many theories about adsorption of ions, among them following 2 are most important
1.  Contact exchange theory.
2.  CO2 exchange theory.
 

1. Contact exchange theory

 
Contact exchange theory
 
In 1951 aenni and his associates develop this theory. This is a process of direct ion exchange between root cells and soil colloids. They observe that cations of soil colloids are generally moving around their own shell and similarly H+ ions of root surface are also moving around their own shell. In this process, once upon a time when two shells are come in contact closely they overlap each other. Then the ions of these two shells, exchange each other. Result by, H+ ions are replaced by other cations.
H+ [Root] + K+ [Clay] → K+ [Root] + H+ [Clay].
 

2. CO2 exchange theory

Walker 1960 differed with Gennis contact exchange theory. According to his theory, he says, plant roots uptake cation and anion in the exchange of H+ and OH-ions from soil solution respectively. The following steps are associated with CO2 exchange theory.
 
 
Step1: After respiration of plant roots and soil micro organism CO2 is produced. By the reaction of CO2 with H2O, H2CO3 acid is produced.
 
Step2:By the dissociation of H2CO3 acid ions pairs of H+ and HCO3­ are produced and these ion  pairs transfer/ locate into a clay surface area of long distance.
 
Step3:Cations like K+ is replaced by H+ from clay surface and produce the ion pairs HCO3­ and K+  and the clay particles become acidic.
 
Step- 4 :These new ion pairs return to the surface of root which is easily available for plants.
 
Step-5 :K+ or HCO3­ both enter into the plant roots with the exchange of H+ of root surface area.

You can read more articles about Agricultural Chemistry

Important Agricultural Websites

Online Agricultural Study

Food and Agricultural Organization

United States Department of Agriculture

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Agriculturist Musa

Agriculture is the key development in the rise of sedentary human civilization. As an agriculture student, I want to make a positive footprint in the young agriculturist community through this blog.

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