The genus Azotobacter comprises large, free living, Gram negative, obiigately aerobic, rod shaped bacteria which are capable for fixation of nitrogen non-symbiotically. Rhizobium is a symbiotic nitrogen fixing bacteria, Nitrosomonas is a nitrifying bacteria, while Pseudomonas sp. is denitrifying bacteria.
The naturally occurring inorganic nutrient found in the soil and food that is necessary for the proper functioning of animal and plant bodies is defined as nutrition. Minerals are vital elements essential for the body.