Hadi asadpour; Saeid Hazrati; Amir reza Sadeghi-Bakhtvari; Bahman Pasban Eslam
Abstract
Arbuscular mycorrhiza fungi (AMF) reduce the effects of drought stress by altering some root properties and absorbing nutrients and water in plants. In order to evaluate the effect of AMF on some characteristics of spring safflower (Carthamus tinctorius L.-cv. Sofeh) under water-deficit condition, this ...
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Arbuscular mycorrhiza fungi (AMF) reduce the effects of drought stress by altering some root properties and absorbing nutrients and water in plants. In order to evaluate the effect of AMF on some characteristics of spring safflower (Carthamus tinctorius L.-cv. Sofeh) under water-deficit condition, this experiment has been carried out at research farm of the Azarbaijan Shahid Madani University, Tabriz in 2018. The experiment is done as a split plot in a completely randomized blocks design with three replications. The results show that the highest petal yield under non-water stress is 281.6 kg/ha and the lowest stress from flowering stage to 197.3 kg/ha. In the control, the highest content of seed oil is 30.65% related to the seed inoculated with AMF. The highest oil yield is obtained from the condition without stress with 1098.9 kg/ha, also in seed inoculated with fungus of 1107.8 kg/ha. The highest seed yield (4884.4 kg/ha) is obtained in the condition without water stress and inoculation of seeds and soil with AMF. In general, water stress leads to reduced yield and inoculation with AMF, especially inoculation of seeds and soil, yield of plants under water stress due to the positive effect on growth improve nutrition and water uptake. Plants inoculated with AMF display improved growth, yield and oil content under water stress conditions than non-inoculated plants.
Mojtaba Khazaie; Alireza Taab
Abstract
A field experiment was carried out to investigate the effect of Persian clover (Trifolium resupinatum L.) as an undersown cover crop on weed control in winter oilseed rape. The experiment was conducted in a randomized complete block design with four replications in Nahavand region (km: 35) of Iran during ...
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A field experiment was carried out to investigate the effect of Persian clover (Trifolium resupinatum L.) as an undersown cover crop on weed control in winter oilseed rape. The experiment was conducted in a randomized complete block design with four replications in Nahavand region (km: 35) of Iran during 2017-2018. The treatments were included oilseed rape with four levels of Persian clover density (25, 50, 75 and 100 percentages of the optimum sowing rate) and two levels of weed management (weedy and weed-free). The results showed that the undresown Persian clover has a significant effect on reducing the density and aboveground dry weight of the weeds compared to the control. Oilseed rape + 25, 50, 75 and 100 percentages of Persian clover sowing rate, respectively, caused 63, 66, 80 and 91 percent reduction in weed density. The same treatments also caused 35, 51, 58 and 75 percent reduction in weed aboveground dry weight, respectively. Oilseed rape yield undersown with Persian clover was lower than oilseed rape in weed free treatment. However, oilseed rape yield in oilseed rape +75 and 100 percentages of Persian clover sowing rate was higher than oilseed rape weed infested treatment. The percentages of oil seed content in oilseed rape in all treatments undersown with Persian clover was equal to oilseed rape weed free treatment and higher than oilseed rape weed infested treatment. The land equivalent ratio in oilseed rape +75 and 100 percentages of Persian clover sowing rate was 0.92 and 1.09, respectively.
Esmaeil Karimi; Ali Tadayyon; Mahmour Reza Tadayyon
Abstract
In order to investigate the effect of different irrigation regimes on yield and leaf proline content of a spring Isfahan local variety of safflower, a field experiment was conducted as split plot in Randomized Complete Block Design with three replications at the Research Station of Shahrekord University ...
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In order to investigate the effect of different irrigation regimes on yield and leaf proline content of a spring Isfahan local variety of safflower, a field experiment was conducted as split plot in Randomized Complete Block Design with three replications at the Research Station of Shahrekord University in 2013-2014. The main factor consisted of four different irrigation regimes (irrigation after 50, 80, 130 and 180 mm evaporation of water from evaporation pan class A) and subplots were spraying humic acid (at a rate of zero, one, three and six liters per hectare). Evaluated traits in this experiment included, the number of heads per plant, 1000 seeds weight, oil content, grain yield, oil yield and leaf proline content. Irrigation treatments and foliar application of humic acid significantly contributed to the above characteristics. Based on means comparisons, less irrigation caused a significant decrease and spraying humic acid also increased significantly number of heads per plant, 1000 seeds weight, grain yield and oil yield. Also, with increased Irrigation and increase application of humic acid, oil content and proline compared to the control group showed a significant increase. In addition, increased irrigation, increase seed oil content from 22.22 percent to 25.43 percent (in irrigation treatment after 180 mm evaporation and application of six lit/ha) has been upgraded. Oil yield also decreased as a result of irrigation after 50 mm evaporation from 394 to 289 kg per hectare after 180 mm evaporation.
Kamyar Kazemi; Mohammad Khajehosseini; Ahmad Nezami; Hamdollah Eskandari
Abstract
Effect of seed priming on germination and seedling growth of sesame investigated under controlled conditions. The primed seeds with ZnSO4 had the maximum germination percentage whereas the highest germination rate was observed in hydro-primed seeds. The treated seeds with PEG showed the best growth of ...
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Effect of seed priming on germination and seedling growth of sesame investigated under controlled conditions. The primed seeds with ZnSO4 had the maximum germination percentage whereas the highest germination rate was observed in hydro-primed seeds. The treated seeds with PEG showed the best growth of the seedlings and rootlet. The complementary field experiment was conducted to evaluate the effect of seed priming and irrigation intervals on the growth and the yield of sesame. A split plot experiment was carried out based on the RCBD with four replications in a field in Northwest of Shadegan during 2013-14 growing season. Main plots were irrigation intervals (irrigation after 150 and 250 mm evaporation from class-A evaporation pan) and sub plots were eight seed priming levels (as the laboratory test). The maximum plant height was observed in plants from the treated seeds with CaCl2 (5 percent) and irrigated after 150 mm evaporation from pan and the minimum plant height was observed from the no-primed seeds and irrigated after 250 mm evaporation from the pan. The highest and the lowest of 1000-seed weight achieved in plants from the treated seeds with hydro-priming and irrigated after 150 mm evaporation from the pan, and in plants from the non-primed seeds and irrigated after 250 mm evaporation from the pan, respectively. The maximum amounts of biological yield, seed yield, water use efficiency, oil yield, oil percentage and the minimum protein content were achieved in plants from the treated seeds with hydro-priming. Irrigation after 250 mm evaporation from the pan decreased the yield and yield components.
Mona Soroori; Seyed MohammadReza Ehteshami; Mohammad Rebiyi; Kazem Khavazi
Abstract
In order to evaluate effect of Azotobacter chroococcum strains on yield, yield components and qualitative indices of winter rapeseed (Brassica napus L.), an experiment was conducted during 2009-2010 growing season at Research Institute of Rice in Rasht. The experimental design was completely randomized ...
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In order to evaluate effect of Azotobacter chroococcum strains on yield, yield components and qualitative indices of winter rapeseed (Brassica napus L.), an experiment was conducted during 2009-2010 growing season at Research Institute of Rice in Rasht. The experimental design was completely randomized block, with three replications. Investigated treatments were including control (without seed inoculation), seed inoculation with Azotobacter chroococcum strains 6, 9, 11, 12, 13, 14, 15, 16, 19, 21, 23, 25, 28, 35 and 38. Results showed that Azotobacter chroococcum significantly affected on all traits. The highest of seed oil yield and K, P, Mg content caused by A. chroococcum strain 14. A. chroococcum strain 12 caused the highest of seed yield with average of 3532.43 kg/ha that hadn’t significant difference with strains 9 and 14. As A. chroococcum strain 12 caused the highest of seed yield components and N, Ca, oil seed content. Growth promoting hormones production, N2 fixation, mineral nutrients dissolubility such as phosphorus, siderophore production and kinds of antibiotics are the effect of Azotobacter chroococcum mechanisms that seems to be using at least one of these mechanisms is increased plant yield. Generally, A. chroococcum strain 12, A. chroococcum strain 14 and A. chroococcum strain 9 had more positive effect on traits compared with other strains. Results of this experiment showed the use of A. chroococcum increases yield and qualitative characteristics of rapeseed and therefore can be used as supplementary of chemical fertilizers.