Summary
By means of a transport kinetic concept the uptake of a given ion by plants can be expressed as a function of the concentration of the ion in soil solution, isolated from the soilin situ in the soil-plant system at any given time during the growth period without disturbance to growing plants.
The kinetic model rests on the assumption that the rate determining step in ion absorption at concentrations of 1 mM or less, is located in the tissues between epidermis and xylem and in all probability in the plasmalemma of the cortical cells.
As the rate of ion transport through the cell membrane may be expressed by a kinetics, analogous to that proposed by Michaelis and Menten for enzymecatalyzed reactions, the rate of uptake (v) of ion M at any time may be expressed by the differential equation
The uptake by plants of M during a time interval to−tn is expressed by the integral of above equation.
One solution is submitted and experimental conditions, necessary for a verification of the proposed kinetic concept, are discussed.
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Nielsen, N.E. A transport kinetic concept of ion uptake from soil by plants. Plant Soil 37, 561–576 (1972). https://doi.org/10.1007/BF01348515
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DOI: https://doi.org/10.1007/BF01348515