In this article we will discuss about:- 1. Origin of Rhizosphere 2. Reasons of Increased Microbial Activity in Rhizosphere 3. Rhizosphere Microorganisms 4. The Rhizosphere Effect 5. Rhizosphere Engineering. Origin of Rhizosphere: In 1904, L. Hiltner for the first time coined the term 'rhizosphere' to denote the area of intense microbiological activity that extends several millimeters from the root system [...]
In this article we will discuss about the biogeochemical cycling of carbon, nitrogen, phosphorus and sulfur. 1. The Carbon Cycle: In nature carbon exists in the form of inorganic and complex organic compounds. In atmosphere the concentration of CO2 is only 0.32% which is less than what is required by plants for photosynthesis. The CO2 is the main source of [...]
The key processes of biogeochemical cycling of nitrogen are: 1. Nitrogen Fixation 2. Ammonification 3. Nitrification 4. Denitrification. 1. Nitrogen Fixation: Nitrogen fixation is a process of conversion of gaseous form of nitrogen (N2) into combined forms i.e. ammonia or organic nitrogen by some bacteria and cyanobacteria. There are free-living as well as symbiotic microorganisms which fix N2 into proteins. [...]