Biomedical Engineering Reference
In-Depth Information
cotton development. Pre-sowing treatment of cotton seeds with Verbactin stimulated growth
and development of useful microbiota, which enriched root system with active metabolites
and positively affected growth and development of cotton in all phases of vegetation.
Comparative analysis of dynamics of development of microbial community digesting organic
and mineral nitrogen sources in test experiments (figure 1-3) revealed extremely positive
influence of Verbactin on community of ammonificating bacteria. Number of ammonificating
bacteria in typical serozyom soil under cotton changed from 3.8 to 9.2 x 10
6
CFU/g soil.
Their highest content was observed in phase of budding, with decrease in 2.8 times in phase
of maturation. Interesting results were obtained in regards of quantity of bacteria digesting
ammoniac forms of nitrogen and those that are responsible for disintegration of mineral
nitrogen-free compounds. The ratio between quantity of bacteria growing on mineral and
organic nitrogen reveals presence of mineralization process. Studied typical serozyom is
characterized by high coefficient of mineralization. Thus, community of oligonitrophilic
microorganisms is developed in typical serozyom soil; their highest quantity is observed in
phase 2-4 leaves (1.81 x 10
7
CFU/g soil). They play main role in nitrogen balance, and after
their action serozyom is enriched by protein compounds that later are mineralized.
Figure 1. Influence of Verbactin on quantity of microorganisms digesting organic and mineral sources
of nitrogen.
Figure 2. Influence of Verbactin on quantity of Azotobacter and nitrifying and denitrifying bacteria.
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