Nitrogen Cycle There are 4 main stages – Fixation, Nitrification, Denitrification and Ammonification 1.Fixation is when Atmospheric Nitrogen is converted to Ammonia Free living cyanobacteria in the soil fix nitrogen Free living cyanobacteria in the soil fix nitrogen Rhizobium bacteria in the root nodules of legumes fix nitrogen Rhizobium bacteria in the root nodules of legumes fix nitrogen Cyanobacteria & Rhizobium bacteria have an enzyme complex called nitrogenise which converts atmospheric nitrogen to ammonia with the use of ATP Cyanobacteria & Rhizobium bacteria have an enzyme complex called nitrogenise which converts atmospheric nitrogen to ammonia with the use of ATP The plant (legume) and the Rhizobium bacteria produce a molecule called Legheamoglobin.
{"Image DocumentName": "2. Circulation of Nutrients", "Image ImageDescription": "Decomposition is the breakdown of organic matter with the release of inorganic nutrients into the surrounding soil. Inorganic ions are released from decomposing matter in a process called mineralisation. Decomposers and Detritivores are involved in decomposing organic matter. Undecomposed material is called litter. Completely decomposed matter is called humus. Invertebrate detritivores (e.g. worms) increase the decomposition rate as they reduce the particle size of the detritus, making it easier for the decomposers (bacteria & fungi) to break down detritus to form humus. Decomposers are the ultimate releasers of energy and carbon dioxide fixed in photosynthesis. Nutrients must be recycled for the primary producers to use. Detritivores (e.g. worms) Decomposers (e.g. wood fungi)", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}