The Nitrogen-Fixing Capacity of Ceanothus velutinus

Authors: Russell, Sterling A.; Evans, Harold J.

Source: Forest Science, Volume 12, Number 2, 1 June 1966 , pp. 164-169(6)

Publisher: Society of American Foresters

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A quantitative study has been conducted of the capacity of Ceanothus velutinus var. laevigatus to fix atmospheric nitrogen. This species grows vigorously in a medium devoid of any form of combined nitrogen. During an 18-week experiment in which plants were grown in a nitrogen-free medium, fresh weight increased from an initial value of 20 g per plant to over 140 g at harvest. Nitrogen content increased from an intial 45 mg to 331 mg per plant at harvest. The efficiency of nitrogen fixation by C. velutinus expressed as mg N fixed per day per g of dry nodule ranged from 2.6 to 25.8. The efficiency of N fixation and the amount of N fixed per growth season is of the same order of magnitude as that reported for several legumes and non-leguminous symbionts.

Document Type: Journal Article

Affiliations: Professor of Plant Physiology, Oregon State University

Publication date: June 1, 1966

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  • Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
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