جستجوی مقالات مرتبط با کلیدواژه "محتوای اسانس" در نشریات گروه "باغبانی"

To observe the effect of plant growth-promoting rhizobacteria (PGPR) and salicylic acid under drought stress conditions on yarrow, an experiment was arranged as split-plot factorial based on a randomized complete block design with three replications in a research farm in Basht, Kohgiluyeh and Boyer-ahmad provice, during two years (2018 and 2019). Drought stress as the main factor in two levels (drought and non-drought stress), and secondary factors include foliar spraying with salicylic acid in two levels: control (no foliar spraying) and foliar spraying with salicylic acid (400 mg/L), and PGPR at four levels: control (no inoculation with bacteria), inoculation with Pseudomonas, inoculation with Azotobacterial and inoculation with both bacteria were assigned to the main and sub-plots, respectively. The results of a two-year combined variance analysis showed that effects of year, drought stress, bacteria, salicylic acid and drought stress × salicylic acid × bacteria on plant height, thousand seed weight, flower yield, biological yield, essential oil content, and essential oil yield were significant. The average flower yield in the first year was 731.45 kg/ha, which had a significant difference compared to the second year. The highest plant height (65.94 cm) was obtained from azotobacterial and salicylic acid treatment under non-drought stress conditions. Meanwhile, in both conditions (non-drought stress and drought stress), the maximum thousand seed weight (0.29 and 0.23 g), flower yield (1389 and 492 kg/ha), biological yield (8634 and 4106 kg/ha), harvest index (16.09 and 11.99 %), essential oil content (1.41 and 0.80 %) and essential oil yield (1.77 and 19.54 kg/ha) were obtained for bacteria and salicylic acid treatment. Although drought stress caused a significant decrease in all traits, especially flower yield, essential oil content and yield, the use of growth-promoting bacteria or salicylic acid, especially in the treatment of simultaneous application of two bacteria and salicylic acid, significantly reduced the damage of drought stress on flower yield, essential oil content and yield compared to the control.

In order to evaluate the effects of foliar application of osmolytes on the quantitative and qualitative yield of German chamomile (Chamomilla recutita L.) in drought stress conditions, a split-plot experiment was conducted based on randomized complete block design with three replications at Research Center of Medicinal Plants, Shahed University. The treatments included irrigation as the main factor in three levels [(irrigation after 50 (without stress), 100 (moderate stress) and 150 mm evaporation from the class A pan (severe stress)] and foliar application of osmolytes as sub-plots in seven levels [(without Spraying (NS), distilled water (W), methyl jasmonate (MJ= 75mM), salicylic acid (SA= 2mM), humic acid (HA= 2.5lit/1000), glycine betaine (GB= 5mM), and g- aminobutyric acid (GABA= 50mM). The electrical conductivity of the irrigation water was 4.8 dS/m. Mean comparisons showed that GABA combined with severe stress had the highest essential oil yield (3.7 kg ha-1). In plants treated with GABA under severe stress, essential oil harvest index was increased by 60 and 58%, respectively, compared to W and NS treatments. The highest and lowest capitol harvest index with 70.81% and 23.28% were respectively obtained from GB combined without stress and W with severe stress. SA, GB, and GABA increased the capitol yield in severe stress compared with the moderate stress. Severe stress caused a significant increase in essential oil content from 0.66 to 1.13%, a 35% reduction in seed harvest index compared to control treatment, and a significant reduction in biomass yield rather than moderate stress. MJ and SA increased seed yield compared with NS in moderate stress.

Foliar application of micronutrients is a useful technique for rapid absorption of minerals in the plants and avoids soil contamination. To evaluate the effect of foliar application of micronutrients (iron and zinc) on yield, yield components, and essential oil of fennel (Foeniculum vulgare Mill.), an experiment was conducted as factorial based on randomized complete blocks design with three replications at the Faculty of Agriculture, University of Zanjan during the growing season of 2012. In this experiment, the effect of foliar application of Fe (using ferrous sulphate) at four concentrations (0, 1, 2 and 3 gr.L-1) and foliar application of Zn (using zinc sulphate) at three concentrations (0, 2 and 4 gr.L-1) were investigated. Results showed that the majority of measured traits including number of umbels per plant, 1000-seed weight, grain yield, essential oil content and essential oil yield were significantly affected (p≤ 0.01) by combined application of iron and zinc. Therefore, the highest grain yield (2637.96 kg ha-1) was obtained in foliar application of Fe + Zn at a concentration of 0.2%. In addition, the highest essential oil content (2.88%) and essential oil yield (75.71 kg ha-1) were obtained in combined application of Fe 0.3% and Zn 0.2% and the lowest content of mentioned traits was obtained in control.

Sweet majoram (Majorana hortensis L.) is one of the native Iranian medicinal plants، which due to its aromatic secondary metabolites is used in traditional medicine. In production of medicinal plants، application of organic inputs has especial role in sustainable agriculture. Organic inputs، such as manures and compost، other than providing the necessary elements for plant growth، could improve the physiochemical structure of soil. This research was conducted to evaluate the growth traits، quantitative and qualitative yield، and constituents of essential oil of sweet majoram under the application of compost extract and inoculation of biofertilizers. The experiment was performed as split plot in time with three replications at Research Greenhouse of Ferdowsi University، Mashhad، Iran، in 2012. Main plots were 16 fertilizer combinations (Azotobacter (Azotobacter paspali)، (B1)، Azospirillum (Azospirillum brasilense) (B2)، mycorrhiza (Glomus intraradaices) (B3)، 10% compost extract (C1)، 20% compost extract (C2)، 30% compost extract (C3)، B1C1، B1C2، B1C3، B2C1، B2C2، B2C3، B3C1، B3C2، B3C3 and control) and sub- plots were three cutting stages during the growing season. Results showed that height of main stem، dry and fresh weight of sweet majoram was significantly affected by single and combined application of biofertilizer inoculation and compost extract at the first cutting and were higher than the second and third cuttings. Also، the most significant increase in height of main stem، fresh and dry weight and essential oil content of sweet majoram (43. 3 cm، 46. 07 g/m2، 27. 11 g/m2 and 0. 89%، respectively) was observed in C1B3 treatmeent. Constituents of essential oil were significantly affected by single and combined applications of biofertilizer inoculation and compost extract. Among the constituents، terpinen-4-ol (18. 01%) and cis-sabinene hydrate (15. 4%) allocated the highest and ledene (15. 4%) and camphene (0. 01%) the lowest amount.