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The hydrogen-ion concentration of heavy alkaline soils

Published online by Cambridge University Press:  27 March 2009

A. F. Joseph  and
F. J. Martin
A. F. Joseph
Affiliation:
Wellcome Tropical Research Laboratories, Khartoum.
F. J. Martin
Affiliation:
Wellcome Tropical Research Laboratories, Khartoum.
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Extract

(1) The colorimetric method is unsuited to the examination of heavy, alkaline soils owing to the turbidity of the suspension.

(2) Where the nature of the suspension permits of colorimetric determinations being made, they agree with those obtained electrometrically: with the latter method practically identical results are obtained using soil-water mixtures or moderately clear extracts.

(3) No disturbing effect is likely to be introduced by amounts of nitrate up to 500 parts per million of soil.

(4) Owing to the effect on the pH of a soil suspension caused by varying the proportion of water and time of extraction, these conditions should be fixed for routine work. We have found 1 hour's extraction with 5 parts of water satisfactory.

(5) On account of the amphoteric or buffer nature of clay, soil shifts the reaction of acids and alkalis in the direction of neutrality.

(6) The effect of sodium salts on a soil is to displace aluminium and so reduce alkalinity: the residual soil after leaching is found to be more alkaline.

(7) The effect of drying alkaline soil is to cause the pH of the extract to be lower than that obtained from the undried soil. If however the time of extraction is prolonged, the differences disappear almost entirely.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 13 , Issue 3 , July 1923 , pp. 321 - 332
Copyright
Copyright © Cambridge University Press 1923

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References

REFERENCES

(1)Clarke, W. M. (1922). The Determination of hydrogenions, p. 158. Baltimore, Williams and Wilkins.Google Scholar
(2)Haass, A. R. C. (1919). “Colorimetric Determination of pH in small quantities of solution.” Journ. Biol. Chemistry, 38, 54.Google Scholar
(3)Gillespie, L. J. and Hurst, L. A. (1918). “Hydrogen-ion concentration.” Soil Science, 6, 224.CrossRefGoogle Scholar
(4)Sharp, L. T. and Hoagland, D. K. (1916). “Acidity and adsorption in soils as measured by the hydrogen electrode.” Journ. of Agric. Research, 7, 127.Google Scholar
(5)Schreiner, O. and Failyer, G. H. (1906). “Colorimetric, turbidimetric and Titration Methods used in Soil Investigations.” U.S. Dept. of Agriculture, Bureau of Soils, Bulletin, No. 31, p. 11.Google Scholar
(6)Bouyoucos, C. J. (1919). “Rate and Extent of Solubility of Soils.” Michigan Experiment Station, Technical Bulletin, No. 44.Google Scholar
(7)Bouyoucos, C. J. (1921). “Rate and Extent of solubility of Minerals and Rocks.” Michigan Experiment Station, Technical Bulletin, No. 50.Google Scholar
(8)Kelley, W. P. and Brown, S. M. (1921). “The solubility of Anions in Alkali soils.” Soil Science, 12, 263.CrossRefGoogle Scholar
(9)Parker, F. W. (1921). “Methods of studying the concentration and composition of Soil Solutions.” Soil Science, 12, 209.CrossRefGoogle Scholar
(10)Hoagland, D. R., Martin, J. C. and Stewart, G. R. (1921). “Relation of the Soil Solution to the soil extract.” Journ. of Agric. Research, 20, 381.Google Scholar
(11)Plummer, J. K. (1918). “Studies in Soil Reaction.” Journ. of Agric. Research, 12, 20.Google Scholar
(12)Prescott, J. A. (1922). “Base Exchange and Alkalinity in Egyptian Soils.” Cairo Scientific Journ., 10, 58.Google Scholar