Determination of the Number of Ammonification Bacteria and Activity of the Ammonification Process in Soils and their Relevance for the Development of the of Soil Health Parameter
Journal Title: Current Investigations in Agriculture and Current Research - Year 2019, Vol 6, Issue 2
Abstract
The results of daily counting of the colony forming units (CFU) number of bacteria capable of the ammonification (AMM) and activity of the AMM process using ammonium concentrations after induction of the AMM by peptone in soil samples from fallow and intensively cropped plots of gray forest soil are presented. Statistical analysis of visually observed wave-like dynamics of CFU revealed statistically significant harmonics in CFU of these soils. The harmonics of the dynamic of CFU of different soils were fairly close by their quantitative characteristics. This indicates not only the dynamic similarity, but also a comparable orderliness in the functioning of the ammonifying component in the differently used soils. The daily dynamics of the ammonium concentration in the soil samples was manifested in the form of curve accumulation of NH4+ in time. The presentation of the results of the dynamics of NH4+ in the form of subtraction differences between the subsequent concentration of NH4+ and the previous one showed that the dynamics of daily production of NH4+ just like the dynamics of CFU, has an oscillating nature. The observed differences in the dynamics of NH4+ in the compared soil ecosystems (SE) - the fallow and intensively cropped plots are very minor. Thus, even detailed monitoring the dynamic of AMM in SE do not allow to reveal significant differences in AMM of genetically identical but differently used soils. Therefore, the process of ammonification cannot be used to identify differences in the “nitrogen” parameters of the soil healthThe main natural processes of nitrogen inputs into the soil ecosystem (SE) are nitrogen fixation and ammonification. The latter process is often called mineralization [1]. The nitrogen fixation by bacteria is a unique biological process that has been thoroughly studied and still continues to be investigated. According to the calculation, the total annual potential nitrogen inputs into the soil ecosystem by free-living nitrogen fixers can range from tens to hundreds of kilograms per hectare. Associative nitrogen fixation is estimated to be about 10-25 kg/ha a year for soils of central Europe and up to 50-100 kg/ha in the subtropical and tropical zones of the planet. At the same time, due to nitrogen-fixing symbionts of leguminous plants, soil enrichment with nitrogen is estimated from 60 to 300 kg/ha per year [2,3].
Authors and Affiliations
Semenov AM, Khvatov IL, Olenin AV
Keywords
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- EP ID EP584590
- DOI 10.32474/CIACR.2019.06.000231
- Views 60
- Downloads 0
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