Effect of Azotobacter chroococcum on sugar beet and microbial activity of rhizosphere
Kuzevski, J.P., Institute for Application of the Science in Agriculture, Belgrade (Serbia) | Milosevic, N.A., Institute of Field and Vegetable Crops, Novi Sad (Serbia) | Krstanovic, S.B., MK Vommerce doo, Novi Sad (Serbia) | Jelicic, Z.S., Institute for Application of the Science in Agriculture, Belgrade (Serbia)
The aim of this research was to determine the effect of genotype, azotobacter and the amount of mineral fertilizers on the root yield of sugar beet and on the microbiological activity of the sugar beet rhizospheric soil. Three hybrids of sugar beet were used during the two years of the research. The seed of the hybrids was inoculated with three strains of azotobacter. Various amounts of NPK were used (0;30;60;90 kg/ha). At the end of the vegetation period, the following were determined: root yield, total number of bacteria, number of azotobacter, oligotrophic bacteria, ammonifiers, fungi, and actinomycetes in soil. Dehydrogenase activity was measured. The results were processed statistically and the effect of the factors was determined upon the expected mean square values. The yield was mainly affected by the amount of mineral fertilizers. However, the effect of examined factors was dependant upon genotype, amount of mineral fertlizers, inoculation and the year of trials. The interaction between genotype, mineral fertilizers, inoculation and the year of trials was the factor that had the greatest effect on the number of almost all the examined soil microorganisms.
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