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The ‘easily reducible’ manganese of soils

Published online by Cambridge University Press:  27 March 2009

H. G. Dion ,
P. J. G. Mann  and
S. G. Heintze
H. G. Dion
Affiliation:
A.R.C. Unit of Soil Metabolism and Chemistry Department, Rothamsted Experimental Station, Harpenden, Herts
P. J. G. Mann
Affiliation:
A.R.C. Unit of Soil Metabolism and Chemistry Department, Rothamsted Experimental Station, Harpenden, Herts
S. G. Heintze
Affiliation:
A.R.C. Unit of Soil Metabolism and Chemistry Department, Rothamsted Experimental Station, Harpenden, Herts
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Extract

1. In studying the factors influencing the ‘easily reducible’ manganese in soils, results were obtained to indicate that the estimation is dependent on the pH of the system, the nature of the salt solution, the nature of the reducing agent and the time of contact, in addition to the amount and nature of the higher oxides of manganese present.

2. Pyrolusite (MnO2) and a synthetic preparation of manganite hydroxide are ‘easily reducible’ oxides, while manganite (MnO(OH)) and naturally occurring hausmannite (Mn Mn2O4) are apparently ‘difficultly reducible’ forms.

3. Since pyrolusite occurs in the easily reducible fraction, those deficient soils which contain only a small proportion of their manganese in the easily reducible form must contain the larger part in a form less reactive than pyrolusite.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 37 , Issue 1 , January 1947 , pp. 17 - 22
Copyright
Copyright © Cambridge University Press 1947

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References

REFERENCES

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