A.R. Sedaghati; M. Kafi; Sh. Rezvan Bidokhti; Sh. Akbari
Abstract
To study the effect of planting date and density on the yield, yield components and allicin content of two garlic ecotypes (Allium sativum L.), an experiment was conducted in a farmland in Damghan, Iran during the 2011-2012 growing season. The experiment was arranged as a split-split-plot in a randomized ...
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To study the effect of planting date and density on the yield, yield components and allicin content of two garlic ecotypes (Allium sativum L.), an experiment was conducted in a farmland in Damghan, Iran during the 2011-2012 growing season. The experiment was arranged as a split-split-plot in a randomized complete block design with three replications. Three planting dates (17-Oct, 11-Nov, 6-Mar) were main plots. Two ecotypes (Kavire Damghan and Hamedan) were subplots, and three planting densities (35, 45 and 55 plants per m2) were sub-sub-plots. The effect of planting date on plant height, fresh and dry weight of bulbs, yield, diameter and dry weight of cloves was significant, and delay in planting date decreased these traits. The values of dry and fresh weight of bulbs, plant yield, dry weight and diameter of cloves and allicin content were significantly higher in Hamedan ecotype in comparison with Kavire Damghan ecotype. The planting density had significant effect on fresh and dry weight of bulb and dry weight and diameter of cloves, as these traits were reduced by increasing the density. Furthermore, the effect of planting density on height and yield of plant and number of cloves in bulb was significant. To achieve the highest fresh yield (1.7kg.m-2) and dry yield (0.27 kg.m-2), 17-Oct was identified as the best planting date. Hamedan ecotype was more favorable as it had higher bulb fresh and dry weight, diameter and dry weight of cloves, allicin contents and yield. The most desirable planting density was 55 plants per m2 due to having higher values of plant height, number of cloves in bulb and yield.
M. Dashti; M. Mirza; M. Kafi; H. Tavakkoli
Abstract
The effects of water deficit on yield, essential oil contents and composition of Noroozak (Salvia leriifolia Benth.) were investigated at Khorasan-e-Razavi Agricultural and Natural Resources Research Center, Mashhad-Iran. The treatments were deficit irrigation based on actual evapotranspiration (ETc) ...
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The effects of water deficit on yield, essential oil contents and composition of Noroozak (Salvia leriifolia Benth.) were investigated at Khorasan-e-Razavi Agricultural and Natural Resources Research Center, Mashhad-Iran. The treatments were deficit irrigation based on actual evapotranspiration (ETc) at the rate of 100% (fully irrigated), 66.6% (moderate stress), 33.3% (severe stress) and non-irrigated (control). The experiment was analyzed in a randomized complete block design with three replications. Results indicated that the essential oil percentage of green leaves and flowering stem in severe stress and control was significantly (P≤0.05) higher than that of fully irrigated treatment. The highest and lowest dry matter yields were obtained in fully irrigated and control treatments, respectively. Severe deficit (P≤0.05) decreased the essential oil yield significantly but it was not affected in moderate stress. Results also showed that 1, 8-cineol, β-pinene and borneol were the main essential oil constituents in all water deficit treatments, included nearly 50% of total essential oil contents. The above essential oil constituents in control treatment increased by 21.1%, 7% and 15.3% in green leaves and 39%, 12% and 55% in flowering stems in comparison with fully irrigated treatment. However cedren-13-ol and δ-cadinene decreased by 58.5% and 46% in green leaves and 52% and 14% in flowering stems, respectively.
Z. Rahimi; M. Kafi; A. Nezami; H.R. Khozaie
Abstract
Purslane (Portulaca oleracea L.) is an annual salt-tolerant species, which could be considered as vegetable, fodder or medicinal plant in saline conditions. Silicon is the second mineral element in the earth's crust after oxygen. Although its role is not so clear in plant nutrition, silicon has positive ...
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Purslane (Portulaca oleracea L.) is an annual salt-tolerant species, which could be considered as vegetable, fodder or medicinal plant in saline conditions. Silicon is the second mineral element in the earth's crust after oxygen. Although its role is not so clear in plant nutrition, silicon has positive effects on plant's yield and resistance to biotic and abiotic stresses. In order to study the effects of salinity and silicon application on some morphophysiologic parameters of purslane (Portulaca oleracea L.), a greenhouse experiment was conducted at Ferdowsi University of Mashhad in a split-plot arrangement based on completely randomized block design with 3 replications during summer 2008. Four salinity levels of NaCl (0.6, 7, 14, 21dS/m) were in main plots and two silicon levels (application of one mMol sodium silicate and not application) allocated to the subplots. The results showed that salinity up to 14 dS/m did not impose any significant differences in fresh and dry weight of leaves and stem, number of leaves, branches, leaf area index, specific leaf area and height of main stem compared with control but at 21 dS/m salinity all the above mentioned parameters decreased significantly, while specific leaf weight increased with increasing salinity. Application of silicon had a positive effect on number of leaves per plant, leaf area index and height of main stem. The results indicated that purslane (Portulaca oleraceae L.) could sufficiently tolerate saline conditions and can be considered as a medicinal plant in saline soils and arid regions. Also silicon application may improve plant's yield and tolerance to environmental stresses.
