There is 78% nitrogen in atmosphere. But this cannot be taken in by the organisms. It needs to be fixed as nitrates and then utilised. This cycle is divided into four phases - nitrogen fixation, ammonification, nitrification, and denitrification (Fig. 12). Phase # 1. Nitrogen Fixation: Fixation of nitrogen takes place by atmospheric and biological agents. Other than this it [...]
The following points highlight the six main steps involved in nitrogen cycle. The steps are: 1. Nitrogen Fixation 2. Nitrogen Assimilation 3. Ammonification 4. Nitrification 5. Denitriflcation 6. Sedimentation. Nitrogen Cycle: Step # 1. Nitrogen Fixation: Conversion of free nitrogen of atmosphere into the biologically acceptable form or nitrogenous compounds is referred to as nitrogen flxation. This process is of [...]
Here is an essay on the nitrogen cycle. Nitrogen is one of the important elements in biological compounds, mainly of nucleic acid and protein and, therefore, it is essential for life. Atmosphere contains about 78% nitrogen, but free nitrogen cannot be utilised by most of the organisms, except a few blue green algae and some bacteria. The fixation of nitrogen [...]