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A rapid electrometric method for measuring “lime requirements” of soils

Published online by Cambridge University Press:  27 March 2009

F. Hardy  and
A. H. Lewis
F. Hardy
Affiliation:
(Imperial College of Tropical Agriculture, Trinidad, B.W.I.)
A. H. Lewis
Affiliation:
(Imperial College of Tropical Agriculture, Trinidad, B.W.I.)
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Extract

1. A method for the rapid determination of lime requirements in laboratories equipped with the quinhydrone electrode is described. (10 gm. of soil are mixed in a small wide-mouthed bottle with 40 c.c. of neutral 0·2 M CaCl2 solution. The mixture is then titrated with 0·03 N lime-water in successive portions of 5 c.c, with three minutes' shaking between each addition. The pH value of the mixture is determined after each addition, and the titration continued until the reaction has passed pH 7·0. The results are plotted, and the exact volume of limewater needed to give a final reaction of pH 7·0 is estimated from the graph.)

2. The method is compared with the Hutchinson-MacLennan method for a series of soils of different textures and different initial exchange reactions. It appears to yield more reliable results; it is less tedious; it is very rapid, and results obtained thereby can readily be reproduced.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 19 , Issue 1 , January 1929 , pp. 17 - 25
Copyright
Copyright © Cambridge University Press 1929

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References

REFERENCES

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