Wheeler, Chris T. Institute of Biomedical and Life Sciences, Department of Biochemistry and Molecular Biology, University of Glasgow, Glasgow, United Kingdom.
- Additional Readings
Trees that can convert (fix) atmospheric nitrogen into a form that can be utilized for growth. The ability to fix atmospheric nitrogen into a form that can be used for plant growth is confined to bacteria and cyanobacteria. Plants fix nitrogen only by virtue of associations with these simple organisms. The best-known associations are the symbioses of Rhizobium bacteria with agricultural legumes, such as clovers, peas, and beans. Rhizobia stimulate the formation of root nodules, which provide a specialized environment within which high rates of nitrogen fixation can occur. Nitrogen fixation not only supports plant growth independent of mineral nitrogen in the soil but also can improve soil nitrogen status as plant residues, notably leaves and fine roots, decay and are mineralized. Accurate estimates of amounts of nitrogen fixed are difficult to obtain, but a well-nodulated, young, densely planted stand of nitrogen-fixing trees may fix 80–200 kg of nitrogen per hectare per year, similar to rates reported for some leguminous crops. See also: Bacteria; Cyanobacteria
The content above is only an excerpt.
for your institution. Subscribe
To learn more about subscribing to AccessScience, or to request a no-risk trial of this award-winning scientific reference for your institution, fill in your information and a member of our Sales Team will contact you as soon as possible.
to your librarian. Recommend
Let your librarian know about the award-winning gateway to the most trustworthy and accurate scientific information.
AccessScience provides the most accurate and trustworthy scientific information available.
Recognized as an award-winning gateway to scientific knowledge, AccessScience is an amazing online resource that contains high-quality reference material written specifically for students. Contributors include more than 9000 highly qualified scientists and 43 Nobel Prize winners.
MORE THAN 8700 articles covering all major scientific disciplines and encompassing the McGraw-Hill Encyclopedia of Science & Technology and McGraw-Hill Yearbook of Science & Technology
115,000-PLUS definitions from the McGraw-Hill Dictionary of Scientific and Technical Terms
3000 biographies of notable scientific figures
MORE THAN 19,000 downloadable images and animations illustrating key topics
ENGAGING VIDEOS highlighting the life and work of award-winning scientists
SUGGESTIONS FOR FURTHER STUDY and additional readings to guide students to deeper understanding and research
LINKS TO CITABLE LITERATURE help students expand their knowledge using primary sources of information