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The yields of cultivated crops, potato included, depend not only on tillage, mineral nutrition and pest and disease protection but also on other factors that they may be affected by to a greater or lesser extent. Recent findings in the field of biophysics and electromagnetic field effects indicate that these fields can significantly affect yield levels. Investigated in the present study was the effect of resonant impulse elec­tromagnetic stimulation (RIES) on the yield of potato tubers. A trial was carried out on irrigated, medium deep, calcareous chernozem soil (loess subtype). The planting materials were treated with seven different frequencies just before plan­ting. Standard crop tending measures were applied. At the end of the growing season, total tuber yield, yield of small tubers and yield of large tubers were measured. Total tuber yield was increased in all the treatments relative to the control. The increases ranged between 1.23 and 14.06 t·ha⁻¹. The highest total yield - 45.47 t·ha⁻¹- was recorded in Treatment G,. Increases of large tuber yield ranged between 0.09 and 14.19 t·ha⁻¹, while chan­ges of small tuber yield varied from - 0.73 to 1.14 t·ha⁻¹. The use of the RIES method produced significant and noteworthy results.
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.
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