Microbial abundance in rhizosphere of sugarbeet in dependance of fertilization and inoculation with Azotobacter chroococcum
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The nonsymbiotic N fixing azotobacter
is an obligate aerobe living in the soil, the
rhizosphere and the plant root. The ability of
various strains to fix atmospheric N positively
affect plant growth and yields. Microbial
interactions with roots may involve either
endophytic or free living microorganisms and can
be symbiotic, assosiative or casual in nature.
Associative and free living microorganisms may
also contribute to the nutrition of plants through a
variety of mechanisms including direct effects on
nutrient awailability (N2-fixation), enhancement of
root growth (PGPR – plant growth promoting
rhizobacteria) as antagonists of root pathogenes
or as saprophytes that decompose soil detritus and
subsequently increase nutrient availability
through mineralization and microbial turnover.
Therefore, the abundance of azotobacter, fungi,
actinomycetes and the total number of
microorganisms in inoculated and non-inoculated
sugar beet rhizosphere were determine in this
stu...dy. Simultaneously we studied the effects of
application of nitrogen fertilizer, manure and
harvest residues. Samples of rhizosphere soil were
taken three times in the course of growing season
(May, July, September). The experiment included
two variants (inoculated with Azotobacter
chroococcum and non-inoculated) at four
fertilization levels (non-fertilized control, 50, 100,
150 and 200 kg N/ha), in five replication. Total
number of microorganisms was determined in soil
agar (dilution of 106
). Fungi were determined on
Chapek agar (dilution of 104
), actinomycetes on a
synthetic agar (dilution of 104
) and azotobacters
on Fiodor substrate (dilution of 102
). The results
of the study for all four fertilization types and all
four levels of added N showed that azotobacter
abundance was higher in inoculated treatments
than in the non-inoculated ones. The highest
increases of total microbial abundance and
number of free N-fixing bacteria were recorded in
the inoculated treatments with NPK fertilizer
alone and in the inoculated treatments with 100 kg
N/ha. The highest percentage increases of
azotobacter were obtained in the inoculated
treatments with manure and manure plus harvest
residues, respectively and in the variant without
N.
Ključne reči:
microorganisms / azotobacter / rhizosphere / sugarbeetIzvor:
Research Journal of Agricultural Science, 2010, 42, 3, 260-264Izdavač:
- Timisoara : Banat´s University of Agricultural Science and Veterinary Medicine "King Michael I of Romania", Faculty of Agriculture
Kolekcije
Institucija/grupa
FiVeRTY - JOUR AU - Mrkovački, Nastasija AU - Marinković, Jelena AU - Čačič, Nikola AU - Bjelić, Dragana PY - 2010 UR - http://fiver.ifvcns.rs/handle/123456789/2542 AB - The nonsymbiotic N fixing azotobacter is an obligate aerobe living in the soil, the rhizosphere and the plant root. The ability of various strains to fix atmospheric N positively affect plant growth and yields. Microbial interactions with roots may involve either endophytic or free living microorganisms and can be symbiotic, assosiative or casual in nature. Associative and free living microorganisms may also contribute to the nutrition of plants through a variety of mechanisms including direct effects on nutrient awailability (N2-fixation), enhancement of root growth (PGPR – plant growth promoting rhizobacteria) as antagonists of root pathogenes or as saprophytes that decompose soil detritus and subsequently increase nutrient availability through mineralization and microbial turnover. Therefore, the abundance of azotobacter, fungi, actinomycetes and the total number of microorganisms in inoculated and non-inoculated sugar beet rhizosphere were determine in this study. Simultaneously we studied the effects of application of nitrogen fertilizer, manure and harvest residues. Samples of rhizosphere soil were taken three times in the course of growing season (May, July, September). The experiment included two variants (inoculated with Azotobacter chroococcum and non-inoculated) at four fertilization levels (non-fertilized control, 50, 100, 150 and 200 kg N/ha), in five replication. Total number of microorganisms was determined in soil agar (dilution of 106 ). Fungi were determined on Chapek agar (dilution of 104 ), actinomycetes on a synthetic agar (dilution of 104 ) and azotobacters on Fiodor substrate (dilution of 102 ). The results of the study for all four fertilization types and all four levels of added N showed that azotobacter abundance was higher in inoculated treatments than in the non-inoculated ones. The highest increases of total microbial abundance and number of free N-fixing bacteria were recorded in the inoculated treatments with NPK fertilizer alone and in the inoculated treatments with 100 kg N/ha. The highest percentage increases of azotobacter were obtained in the inoculated treatments with manure and manure plus harvest residues, respectively and in the variant without N. PB - Timisoara : Banat´s University of Agricultural Science and Veterinary Medicine "King Michael I of Romania", Faculty of Agriculture T2 - Research Journal of Agricultural Science T1 - Microbial abundance in rhizosphere of sugarbeet in dependance of fertilization and inoculation with Azotobacter chroococcum EP - 264 IS - 3 SP - 260 VL - 42 UR - https://hdl.handle.net/21.15107/rcub_fiver_2542 ER -
@article{ author = "Mrkovački, Nastasija and Marinković, Jelena and Čačič, Nikola and Bjelić, Dragana", year = "2010", abstract = "The nonsymbiotic N fixing azotobacter is an obligate aerobe living in the soil, the rhizosphere and the plant root. The ability of various strains to fix atmospheric N positively affect plant growth and yields. Microbial interactions with roots may involve either endophytic or free living microorganisms and can be symbiotic, assosiative or casual in nature. Associative and free living microorganisms may also contribute to the nutrition of plants through a variety of mechanisms including direct effects on nutrient awailability (N2-fixation), enhancement of root growth (PGPR – plant growth promoting rhizobacteria) as antagonists of root pathogenes or as saprophytes that decompose soil detritus and subsequently increase nutrient availability through mineralization and microbial turnover. Therefore, the abundance of azotobacter, fungi, actinomycetes and the total number of microorganisms in inoculated and non-inoculated sugar beet rhizosphere were determine in this study. Simultaneously we studied the effects of application of nitrogen fertilizer, manure and harvest residues. Samples of rhizosphere soil were taken three times in the course of growing season (May, July, September). The experiment included two variants (inoculated with Azotobacter chroococcum and non-inoculated) at four fertilization levels (non-fertilized control, 50, 100, 150 and 200 kg N/ha), in five replication. Total number of microorganisms was determined in soil agar (dilution of 106 ). Fungi were determined on Chapek agar (dilution of 104 ), actinomycetes on a synthetic agar (dilution of 104 ) and azotobacters on Fiodor substrate (dilution of 102 ). The results of the study for all four fertilization types and all four levels of added N showed that azotobacter abundance was higher in inoculated treatments than in the non-inoculated ones. The highest increases of total microbial abundance and number of free N-fixing bacteria were recorded in the inoculated treatments with NPK fertilizer alone and in the inoculated treatments with 100 kg N/ha. The highest percentage increases of azotobacter were obtained in the inoculated treatments with manure and manure plus harvest residues, respectively and in the variant without N.", publisher = "Timisoara : Banat´s University of Agricultural Science and Veterinary Medicine "King Michael I of Romania", Faculty of Agriculture", journal = "Research Journal of Agricultural Science", title = "Microbial abundance in rhizosphere of sugarbeet in dependance of fertilization and inoculation with Azotobacter chroococcum", pages = "264-260", number = "3", volume = "42", url = "https://hdl.handle.net/21.15107/rcub_fiver_2542" }
Mrkovački, N., Marinković, J., Čačič, N.,& Bjelić, D.. (2010). Microbial abundance in rhizosphere of sugarbeet in dependance of fertilization and inoculation with Azotobacter chroococcum. in Research Journal of Agricultural Science Timisoara : Banat´s University of Agricultural Science and Veterinary Medicine "King Michael I of Romania", Faculty of Agriculture., 42(3), 260-264. https://hdl.handle.net/21.15107/rcub_fiver_2542
Mrkovački N, Marinković J, Čačič N, Bjelić D. Microbial abundance in rhizosphere of sugarbeet in dependance of fertilization and inoculation with Azotobacter chroococcum. in Research Journal of Agricultural Science. 2010;42(3):260-264. https://hdl.handle.net/21.15107/rcub_fiver_2542 .
Mrkovački, Nastasija, Marinković, Jelena, Čačič, Nikola, Bjelić, Dragana, "Microbial abundance in rhizosphere of sugarbeet in dependance of fertilization and inoculation with Azotobacter chroococcum" in Research Journal of Agricultural Science, 42, no. 3 (2010):260-264, https://hdl.handle.net/21.15107/rcub_fiver_2542 .