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Use of the quantity/potential relationship to provide a scale of the ability of extractants to remove soil potassium

Published online by Cambridge University Press:  27 March 2009

T. M. Addiscott
T. M. Addiscott
Affiliation:
Rothamsted Experimental Station, Harpenden, Herts.
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Summary

Quantity/potential relationships, between gain and loss of K by the soil and K potential (RT In ακ/⊧αca+Mg) were determined on twenty-seven Rothamsted and Woburn soils. K extracted by neutral N ammonium acetate, by H-resin and 0·5 M sodium bicarbonate (pH 8·5) were also measured.

The ability of an extractant to remove soil K is equated to a K potential (derived from the quantity/potential curve) which the soil attains on removing K equal to that taken out by extractant. Mean values for all soils were – 4995 ± 97 cal/equiv for the ammonium acetate, – 6081 ± 88 cal/equiv for the H-resin and – 4336 ±117 cal/equiv for the sodium bicarbonate extractants. For the first and last extractants the ability to remove K was less in rich than in poor soils.

Varying the ammonium ion concentration from 0·1 N to 1 N in ammonium acetate/acetic acid mixtures, N in acetate ions, did not greatly affect their ability to remove K.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 74 , Issue 1 , February 1970 , pp. 119 - 121
Copyright
Copyright © Cambridge University Press 1970

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References

REFERENCES

Acquaye, D. R., MacLean, A. J., & Rice, H. M. (1967). Potential and capacity of potassium in some representative soils of Ghana. Soil Sci. 103, 79–89.Google Scholar
Addiscott, T. M. (1970). The potassium Q/I relationships of soils given different K manuring. J. agric. Sci., Camb. 74, 123–9.Google Scholar
Arnold, P. W. (1958). Potassium uptake by cation exchange resins from soils and minerals. Nature, Lond. 182, 1594–5.CrossRefGoogle Scholar
Arnold, P. W. (1962). The potassium status of some English soils considered as a problem of energy relationships. Proc. Fertil. Soc. 72, 25–43.Google Scholar
Barrow, N. J. (1966). Nutrient potential and capacity. II. Relation between potassium potential and buffering capacity and supply of potassium to plants. Aust. J. agric. Res. 17, 849–62.CrossRefGoogle Scholar
Barrow, N. J., Ozanne, P. G. & Shaw, T. C. (1965). Nutrient potential and capacity. I. The concepts of nutrient potential and capacity and their application to soil potassium and phosphorus. Aust. J. agric. Res. 16, 61–76.Google Scholar
Beckett, P. H. T. (1965). Activity coefficients for studies on soil potassium. Agrochimica 9(2), 150–2.Google Scholar
Beckett, P. H. T., Craig, J. B., Nafady, H. M. H. & Watson, J. P. (1966). Studies on soil potassium. V. The stability of Q/l relations. Pl. Soil 25 (3), 435–55.CrossRefGoogle Scholar
Beckett, P. H. T. & Nafady, H. M. H. (1967). Studies on soil potassium. VI. The effect of K fixation and release on the form of the K:(Ca + Mg) isotherm. J. Soil Sci. 18 (2), 244–62.Google Scholar
MacConaghy, S. & Smillie, G. (1965). Soil potassium and its availability to crops. I. Uptake by ryegrass in relation to soil potassium potential. Rec. agric. Res. Min. of Ag. N. Ireland 14 (2), 79–94.Google Scholar
Schofield, R. K. (1947). A ratio law governing the equilibrium of cations in the soil solution. Proc. llth Int. Cong. Pure appl. Chem., London 3, 257–61.Google Scholar
Talibudeen, O. & Dey, S. K. (1968). Potassium reserves in British soils. I. The Rothamsted Classical Experiments. J. agric. Sci., Camb. 71, 95–104.Google Scholar
Woodruff, C. M. (1955). The energies of replacement of calcium by potassium in soils. Proc. Soil. Sci., Soc. Am. 19, 167–71.Google Scholar