Define and state one organism responsible for these process: ammonification,
nitrification, denitrification, nitrogen fixation, decomposition
Ammonification; is the process of conversion of organic nitrogen (nitrogen contained in living organisms) into inorganic ammonia (NH3) or ammonia ions (NH4) by ammonifying bacteria such as Bacillus vulgaris.
Nitrification; it's the of conversion of Ammonia (NH3)to nitrates (NO2-) and nitrites (NO3-) by soil living bacteria (nitrifying bacteria) such as Nitrosomonas sp.
Denitrification; it's part of nitrogen cycle where nitrates are reduced in the soil to molecular nitrogen (N2) which is then released into the atmosphere by organisms such as Pseudomonas and Paracoccus.
Nitrogen fixation; it is where the atmospheric nitrogen (N2) is converted into nitrogen compounds for plants and animals use. One organism responsible for nitrogen fixation is Rhizobium.
Decomposition; this refers to the breakdown of complex molecules composing of dead organisms into simple nutrients that are re-utilized by living organisms. Organism such as bacteria or fungi are responsible for decomposition.