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- W2008791043 abstract "Abstract The absorption of an ion is balanced, electrically, by either an uptake of an equivalent amount of counter ions or an exchange for ions of the same charge. An ion such as phosphate can be removed from a many-component solution in different ways, e.g., together with potassium, calcium, or magnesium, or in exchange for hydroxyl ions. In each individual case the status of the nutrient in the soil is expressed by a different chemical potential, and without further knowledge it is not possible to say which potential best expresses the availability. Schofield's phosphate potential implies phosphate uptake associated with calcium. This potential, like Woodruff's potassium potential, has been chosen arbitrarily and does not apply to the general process of phosphate uptake. A physiologically meaningful nutrient potential must be selected relative to the uptake process. Thus, if nutrient A is taken up with counter ion B, then AB's chemical potential is of interest. The fact that uptake processes are not sufficiently understood and proposed mechanisms are not generally accepted puts serious limitations on the usefulness of the potential concept. A few possibilities for selecting nutrient potentials are discussed. Since the nutrient capacity is the differential between nutrient content and potential, the above problem of selection is also inherent in the capacity." @default.
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- W2008791043 date "1973-06-01" @default.
- W2008791043 modified "2023-09-26" @default.
- W2008791043 title "The use of chemical potentials to express nutrient availabilities" @default.
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- W2008791043 doi "https://doi.org/10.1016/0016-7061(73)90044-x" @default.
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