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The nitrogen status of soils Part II. The effect of levels of application on the nitrification of some nitrogenous fertilizers

Published online by Cambridge University Press:  27 March 2009

O. Owen  and
G. W. Winsor
O. Owen
Affiliation:
Experimental and Research Station, Cheshunt, Herts
G. W. Winsor
Affiliation:
Experimental and Research Station, Cheshunt, Herts
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Extract

1. Laboratory experiments in five soils to which hoof and horn materials were added at different concentrations have shown that the percentages nitrified throughout the transformation were largely independent of the level of application. The ranges of concentration used were 90–360 p.p.m., 150–350 p.p.m. and 100–300 p.p.m. nitrogen.

Similar results were obtained with dried blood in two soils.

2. Experiments in two soils with ammonium sulphate and in one soil with glycine, urea and guano showed a different response to level of application, the percentages nitrified at the different concentrations being widely different throughout the period of active transformation.

3. An explanation of the results is given on the basis of the relative rates of formation of ammonia and of its transformation to nitrate.

4. The importance of ammonia determinations in the interpretation of nitrification studies is emphasized.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 40 , Issue 1-2 , January 1950 , pp. 191 - 197
Copyright
Copyright © Cambridge University Press 1950

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References

REFERENCES

Fraps, G. S. (1906). J. Amer. Chem. Soc. 28, 213.CrossRefGoogle Scholar
Owen, O., Rogers, D. W. & Winsor, G. W. (1950). J. Agric. Sci. 40, 185.CrossRefGoogle Scholar
Waksman, S. A. (1923). Soil Sci. 15, 241.CrossRefGoogle Scholar