CONSERVING OF THE RESOURCES
Soil microbiology is highly linked with the microorganisms and their particular activities regarding the growth of plants and yield while taking a part of the nitrogen cycle which is an important component in the providing of nutrients for the growth of plants. In the case of atmospheric nitrogen fixation, organic matter decomposition and releasing of some bio-chemical enzymes are the important factors regarding the growth of plants and roots. In generally, the microorganisms are categorized into a few of specific groups while considering their biological features and behaviors such as bacteria, viruses, fungus and algae. When considering the main role of microorganisms can do in the soil is the increasing of soil fertility while improving the soil structure, increasing the plant tolerance and providing of a self protection against the diseases of plants. According to the agricultural practices, the great diversity of microorganisms plays a few of important roles in the maintaining of the equilibrium of the soil and plant including the top soil which provides habitations for a large number of microbial communities.