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The Protective Action, against MgCO3, of CaCO3 for A. chroococcum

Published online by Cambridge University Press:  27 March 2009

Chas. B. Lipman  and
Paul S. Burgess
Chas. B. Lipman
Affiliation:
(Agricultural Experiment Station. Berkeley, California.)
Paul S. Burgess
Affiliation:
(Agricultural Experiment Station. Berkeley, California.)
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Extract

In investigations on the effects of calcium carbonate and magnesium carbonate on nitrogen fixation by A. chroococcum in soils and in solutions, the following results have been obtained:

1. Calcium carbonate in mannite solution cultures acts only as a stimulant, never as a toxic agent at least up to and including a concentration of 2%.

2. Magnesium carbonate is sharply toxic in solution cultures in concentrations in excess of ·1% to ·2%.

3. Calcium carbonate in soil cultures is without effect up to 1·4% of the dry weight of the soil when it becomes slightly toxic in the Anaheim sandy soil.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 6 , Issue 4 , December 1914 , pp. 484 - 498
Copyright
Copyright © Cambridge University Press 1914

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References

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