Soil microflora

Soil dwelling organisms belong to the group of unicellular (bacteria, fungi, actinomyces, viruses, protozoa). They participate in the cycle of substances in nature. The main criterion of group membership is the ability to multiply in the soil. Specific features of certain groups defined (nitrogen-fixing, nitrifying, cellulose and other). The number of microorganisms in the soil is hundreds of millions and billions in 1 g of soil, and the total mass of bacteria on 1 Ha amounts to 7 so the Greatest number of pathogens is at a depth up to 50 cm (in the root systems of higher plants - mihrisah). Germs live on the surface and partially within the soil lumps colonies, receiving nutritional substances from liquid phase of the soil. Quantitative and qualitative composition (for example, proteases and ammonification, optional and obligate anaerobes) depends on relations soil biocenosis, including between soil microbes and higher plants, as well as the nature of the available soil organic matter. Participating in the transformation of these substances (nitrogen cycle and carbon) consecutively changing physiological groups of microorganisms use them as sources of energy and plastic resources.
Among soil microorganisms meet pathogenic for humans and animals (Bac. anthracis, pathogenic clostridia etc). The soil has the ability of self-purification. Pathogenic microbes that are not related to the soil (e.g., pathogens of enteric infections, tuberculosis, brucellosis), getting into the soil from humans and animals die because of inadequate protection and genotype and antibiotic effects of the products of metabolism of microbes in the soil. The timing of the deaths of these pathogens different (usually from a few days up to 4-5 weeks, and sometimes up to a year) and depend on the degree of soil contamination and microbial activity.