Nitrosomonas

These bacteria are a key link in the soil nitrification process. They specialize in the oxidation of ammonia (NH₃) to nitrites (NO₂⁻), which is the first stage of transforming nitrogen into a plant-accessible form.

In the natural environment, Nitrosomonas function in close symbiotic connection with nitrobacteria (Nitrobacter), which subsequently oxidize nitrites into nitrates.

The biological activity of these bacteria directly determines the availability of nitrogen fertilizers for the root system of agricultural crops.

These microorganisms live in aerobic conditions, residing on the surface of soil particles near the rhizosphere, where ammonia concentration is optimal for their metabolic processes.

For active reproduction, Nitrosomonas require specific conditions, including a sufficient supply of oxygen within the soil profile.

The optimal acidity range for these bacteria is slightly alkaline to neutral (pH 7.0–8.0).

Temperature is also critical: peak activity is observed at soil temperatures between +20 and +30 degrees Celsius.

Soil moisture must be maintained at approximately 60% of field capacity to ensure intense metabolic exchange.

The presence of sufficient ammonium nitrogen (resulting from fertilizers or organic matter decomposition) is the primary factor stimulating the population density of these bacteria.

It is important to understand that Nitrosomonas do not cause plant diseases. However, excessive intensity of their activity under certain conditions can lead to agronomic challenges.

Rapid nitrification can lead to the accumulation of nitrates in the soil, which are easily leached from the root zone during heavy rainfall or over-irrigation.

Nitrate leaching into groundwater is not only a loss of valuable fertilizer but also an environmental concern contributing to water resource pollution.

Under anaerobic conditions or excessive nitrogen application, processes involving these bacteria may indirectly contribute to the emission of greenhouse gases.

Therefore, the risk is not related to bacterial pathogenicity but to the uncontrolled nitrogen transformation processes that reduce the efficiency of agricultural technologies.

Since Nitrosomonas are beneficial soil inhabitants, "control" measures are aimed at regulating their activity to improve the efficiency of nitrogen uptake by crops.

The use of nitrification inhibitors helps slow down the conversion of ammonium nitrogen into nitrates, preventing nitrogen losses and extending its availability period for plants.

Regular monitoring of soil pH (liming acidic soils) creates a favorable environment for beneficial microbiota, enhancing the overall productivity of the field.

Optimization of soil aeration through cultivation and proper irrigation management helps maintain a balance of nitrogen processes within the rhizosphere.

• Utilization of slow-release nitrogen fertilizers.
• Adherence to organic matter application rates to maintain humus levels.
• Drainage control to prevent waterlogging and the formation of anaerobic zones.