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- W757978913 abstract "Summary The objective of this study has been to determine tof L-tryptophan on the biological propert ies of soil. The influence of L-tryptophan, a precursor of auxins, was te sted in a pot experiment. Another aim has been to c heck whether it is possible to enhance the effect of L-tryptophan by i ncreasing the pool of soil-borne Azotobacter spp. b acteria. The experiments were performed on samples of eutrophic brown soil developed from loamy sand of the pH KCl equal to 6.9. Portions of soil weighing 3.2 kg were placed in pots. The resea rch comprised two series: with and without the vacc ine Azotobakteryna added to soil. L-tryptophan was applied in the foll owing doses: 0; 0.5; 5; 50 and mg kg -1 of soil. Onion was the tested plant. The results have demonstrated that L-tryptophan sig nificantly affected the growth and development of o nion. It had positive influence on the microbiological and biochemical pr operties of soil. L-tryptophan raised counts of the following bacteria: oligotrophic and their endospores, copiotrophic and their endospores, ammonifying, nitrogen-immobilizi ng, Azotobacter, and cellulolytic cells, as well as actinomycetes an d fungi. It also stimulated the activity of dehydro genases, urease, acid and alkaline phosphatase. In contrast, it decreased the counts of Arthrobacter and Pseudomonas. The vaccin e Azotobakteryna increased the counts of such bacteria as Azotobacte r, oligotrophs and their endospores, copiotrophs an d their endospores, nitrogen-fixing bacteria, Arthrobacter, Pseudomonas , actinomycetes and fungi. The vaccine stimulated t" @default.
- W757978913 created "2016-06-24" @default.
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- W757978913 date "2013-01-01" @default.
- W757978913 modified "2023-09-23" @default.
- W757978913 title "Biological effects of L-tryptophan and the vaccine azotobakteryna in soil." @default.
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