Written in English
|The Physical Object|
|Pagination||vi, 77 leaves,|
|Number of Pages||77|
adshelp[at] The ADS is operated by the Smithsonian Astrophysical Observatory under NASA Cooperative Agreement NNX16AC86ACited by: Azotobacter in soil: The presence of Azotobacter sp. in soils has beneficial effects on plants, but the abundance of these bacteria is related to many factors, soil physico-chemical (e.g. organic matter, pH, temperature, soil moisture) and microbiological properties. 10 Its abundance varies as per the depth of the soil profile. In Waste Management Series, Bacteria. It has been shown that Azotobacter chroococcum can grow in the presence of various OMWW concentrations, but optimally in 15% OMWW, while preserving its nitrogenase activity (García-Barrionuevo A. et al., ). Moreno E. et al. () and Rubia de la () have also shown that the A. chroococcum can grow on substrates containing aromatic . Azotobacter, Azospirillum, and PSB inoculants can be expected to improve plant growth if the inoculated bacteria are established and grow well in the rhizosphere. The P deficiency of the soil can be corrected by inoculating seeds with PSB along with phosphatic fertilizers (Bakhshandeh et al., ).
Role of Azotobacter in soil fertility Azotobacter in soil: The presence of Azotobacter sp. in soils has beneficial effects on plants, but the abundance of these bacteria is related to many factors, soil physico–chemical (e.g. organic matter, pH, temperature, soil moisture) and microbiological properties Its abundance varies as per the. A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Abstract. Azotobacter vinelandii cells grew well in a medium made from soil and distilled water which contained little or no carbohydrate. They utilized p-hydroxybenzoic acid and other phenolic acids, soil nitrogen, and water-soluble mineral een soils which supported excellent growth of A. vinelandii contained 11 to 18 different phenolic acids each, including p-hydroxybenzoic. Azotobacter species are Gram-negative bacteria found in neutral and alkaline soils, in water, and in association with some plants. Cysts of the genus Azotobacter are more resistant to adverse environmental factors than the vegetative cells; in particular, they are twice as resistant to UV light.
Azotobacter is a genus of usually motile, oval or spherical bacteria that form thick-walled cysts and may produce large quantities of capsular are aerobic, free-living soil microbes that play an important role in the nitrogen cycle in nature, binding atmospheric nitrogen, which is inaccessible to plants, and releasing it in the form of ammonium ions into the soil (nitrogen fixation). Azotobacter are heterotrophic and aerobic bacteria and their main property is the ability to fix nitrogen non-symbiotically, with a genomic content of G-C of 63– % (T m) (4, 32), and distributed in soils, water and sediments (35, 36). Above are soil samples containing differing amounts of top left sample displays a healthy amount of Azotobacter, which decreases to moderate level in the top right and a poor level of Azotobacter in the bottom sample. Image from N.A. Krasil'nikov.. References. Azotobacter cysts. The Microbe Zoo, Digital Learning Center for Microbial Ecology. The fourth edition of Soil Microbiology, Ecology and Biochemistry updates this widely used reference as the study and understanding of soil biota, their function, and the dynamics of soil organic matter has been revolutionized by molecular and instrumental techniques, and information technology. Knowledge of soil microbiology, ecology and biochemistry is central to our Reviews: