Improvement and breeding
M. Rahghoshahi; Kh. Panahi Kord Laghari; M.M. Rahimi
Abstract
Cumin (Cuminum cyminum L.) is one of the valuable medicinal plants cultivated in arid and semi-arid regions of Iran, facing to drought stress. Accordingly, an experiment was conducted to investigate the effects of algae extract and humic acid on cumin under drought stress conditions as a factorial split ...
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Cumin (Cuminum cyminum L.) is one of the valuable medicinal plants cultivated in arid and semi-arid regions of Iran, facing to drought stress. Accordingly, an experiment was conducted to investigate the effects of algae extract and humic acid on cumin under drought stress conditions as a factorial split plot in a randomized complete blocks design with three replications in a farm located in Boyer-Ahmad city, 35 km from Yasouj, Kohgiluyeh and Boyer-Ahmad province in 2019 and 2020 years. The experimental factors included drought stress as the main factor at three levels of irrigation after consumption of 35 (control), 70, and 90% of soil moisture and humic acid at two levels of 0 and 300 mg.L-1 and algae at two levels of 0 and 2 L.ha-1 as the sub-factors. The results showed that foliar application of humic acid and algae extract had a significant effect on essential oil yield, number of branches, biological yield, grain yield, 1000-seed weight, number of seeds per umbrella, number of umbrellas per plant, plant height, and essential oil percentage and improved the negative effects of drought stress. The highest grain yield, 1000-grain weight, essential oil yield, and number of grains per umbrella were obtained by foliar application of humic acid and algae extract. The application of humic acid was more effective than algae extract on traits except yield and essential oil percentage which were more affected by algae extract. In general, the results showed that foliar application of humic acid and algae extract could moderate the adverse stress conditions and increase cumin yield by 41.4%.
A. Javanmard; P. Karimi Karamjavan; M. Amani Machiani; A. Ostadi; S. Shahbazi Doorbash
Abstract
In order to investigate the effects of combined and separate application of macro and micro nano fertilizers with chemical fertilizers on quantitative and qualitative traits of medicinal plant dragon’s head (Lallemantia iberica (MB) Fischer & Meyer), a field experiment was performed based on ...
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In order to investigate the effects of combined and separate application of macro and micro nano fertilizers with chemical fertilizers on quantitative and qualitative traits of medicinal plant dragon’s head (Lallemantia iberica (MB) Fischer & Meyer), a field experiment was performed based on the randomized complete block design (RCBD) with seven treatments and three replications on the research farm of Maragheh University in 2017. Experimental treatments included the use of 100% conventional chemical fertilizer (urea and triple superphosphate with values of 150 and 100 kg ha-1, respectively), 100% macro nano fertilizer, 100% micro nano fertilizer, 50% macro nanofertilizer+50% micro nano fertilizer, 50% chemical fertilizer+50% macro nano fertilizer, 50% chemical fertilizer+50% micro nano fertilizer, and 50% chemical fertilizer+25% macro nanofertilizer+25% micro nano fertilizer. The results showed that the highest (73.3) and lowest (59.1) chlorophyll indices were obtained by applying 50% chemical fertilizer+25% macro nano fertilizer+25% micro nano fertilizer, and separate application of 100% micro nano fertilizer, respectively. Also, the highest values of number of lateral branches, main stem length, number of flower cycles per plant, number of seeds per plant, biological yield, seed yield, 1000-seed weight and seed mucilage content were obtained in 50% chemical fertilizer+25% macro nanofertilizer+25% micro nanofertilizer treatment. Chemical analysis of the essential oils demonstrated that linalool, menthol, geraniol, geranial, menthyl acetate, β-bourbonene, geranyl acetate, (E)-caryophyllene, germacrene D, spathulenol and caryophyllene oxide were the main constituents of essential oils. The highest content of β-bourbonene, caryophyllene oxide, (E)-caryophyllene, menthol, and geraniol was obtained with the combined use of 50% chemical fertilizer+25% macro nanofertilizer+25% micro nano fertilizer. In general, based on the results of the present research, the combined use of chemical fertilizers and macro and micro nano fertilizers can be recommended due to the increased seed yield and dragon’s head qualitative traits under rainfed conditions.
F. Safikhani; H. Heydarye sharifabadi; S.A. Syadat; E. Sharifi ashorabadi; S.M. Syednedjad; B. Abbaszadeh
Volume 23, Issue 2 , August 2007, , Pages 183-194
Abstract
In order to investigate the effect of drought stress on yield and morphologic characteristics of Deracocephalum moldavica L. under field condition, this research wsa conducted in 2004-2005 at Alborz station. Experiment was carried out in a split plot with randomized complete block design with four replications. ...
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In order to investigate the effect of drought stress on yield and morphologic characteristics of Deracocephalum moldavica L. under field condition, this research wsa conducted in 2004-2005 at Alborz station. Experiment was carried out in a split plot with randomized complete block design with four replications. Main factors consisted of three plant populations of Deracocephalum moldavica L. which were collected from Tehran, Esfahan and Farse provinces. Subplots consisted of three level of drought stress (100%, 60% and 40% Fc). The results showed the effect of different plant population on morphological characteristics and yield were not significant. Effect of drought stress on length, cross and leaf surface, high plant, stem diameter, lateral shoot, length of highest internodes, weight of 1000 grain and flower shoot, leaf, stem and biological yield were significant. Mean of treatments showed that control (without drought stress treatments) at first and second years were 4126 and 4033 kg/ha of flower shoot and 4929 and 4921 kg/ha biological yield had significant differences with other drought levels. Mean of interaction effects of main and sub plots not showed significant difference for shoot flower production. Highest biological yield was related to controls of three plant population which were different to other treatments. It could be included from this investigation that mild stress could be applied in complete flower stage harvest.
