What bacteria chemosynthetics are especially important for agriculture?

Nitrifying bacteria are most important for agriculture. Nitrifying bacteria oxidize ammonia formed during the decay of organic residues to nitrite, and then to nitrate.
Nitrifying bacteria belong to the most common group of chemolithotrophic microorganisms in nature, which is associated with the presence of reduced forms of nitrogen in various ecosystems. The most common are ammonium oxidizing bacteria. Nitrifying bacteria develop in soils, loose rocks, thermal springs, in sea and fresh water, in silts.
Nitrifying bacteria served as a factor in the formation of saltpeter deposits. They participate in the weathering of rocks and stone structures. A huge role is played in the process of soil formation. The nitrification process takes place in the soil on a large scale and serves as a source of nitrates for plants. Vital activity of bacteria is one of the most important factors in soil fertility.

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