POSSIBILITY OF ACHIEVING ORGANIC YIELDS FOR MEDICINAL AND AROMATIC PLANTS BY BIOFERTILIZATION WITH Azotobacter chroococcum
The aim of this study was to examine the effects of management practices and biofertilization on microbial
activity in rhizosphere and yield of medicinal and aromatic plants. Field experiment was performed using
four plant species: peppermint (Mentha × piperita L.), pot marigold (Calendula officinalis L.), sweet basil
(Ocimum basilicum L.), and dill (Anethum graveolens L.). Treatments were arranged in a split-plot layout in
four replicates using basic plots under conventional and organic management, and subplots with and without
biofertilizer (Azotobacter chroococcum). Organic management positively affected the microbial number and
activity. Biofertilization increased the total microbial number (13–21%), number of ammonifiers (13–60%),
nitrogen-fixing bacteria (7–36%), actinomycetes (36–50%), fungi (60–100%), cellulolytic microorganisms
(57–217%), dehydrogenase (28–52%) and ß-glucosidase activity (15–39%). The effects of management
practices and biofertilization were highly significant for the yield of examined plants. The yields were higher
on inoculated treatments both in conventional (5–26%) and organic (7–15%) growing system.
Azotobacter chroococcum; dill; peppermint; pot marigold; sweet basil
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