Raheleh Sadat Aletaha Maki; Ali Akbar Safari Sinegani; Doustmorad Zafari
Abstract
In highly stressed ecosystems, symbiosis between plants and has beneficial effects on plant growth. The objective of this study was the effects of two dark septate endophyt fungi against mycorrhizal (Glomus mussea and Glomus interaradices) and Piriformospora indica on Spinach growth in without and with ...
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In highly stressed ecosystems, symbiosis between plants and has beneficial effects on plant growth. The objective of this study was the effects of two dark septate endophyt fungi against mycorrhizal (Glomus mussea and Glomus interaradices) and Piriformospora indica on Spinach growth in without and with drough stress (Field Capacity (FC) and 50% FC). This study was done at Bu- Ali sina university of Hamedan greenhouse (2015-2016). The percentage of root colonization, wet and dry weights, contents of chlorophyll and some of micro- and macronutrients have been analysed in some adult treated plants after six weeks. The colonization results showed that all studied fungi can effectively enter into spinach roots. Inoculation with Glomus mussea increased the wet weight (20 g/plant) of the plants. Also, some morphophysiological and physological properties such as dry weight (4.1 g/plant), chlorophyll content (2.7 mg/gwd) and potassium to sodium ratio (8.4) were increased when plants inoculated with Curvularia specifera. However, high phosphorus content (311.2 mg/100gwd) measured in plants that was inoculated with Glomus interaradices. Generally, this study shows dark septate endophyte could be benefical in grwoth of spinach as much as mycorrhizal and Piriformospora indica symbiosis.
masoud fattahi; Abdorahman Mohammadkhani; Behroz Shiran; Bahram Baninasab; Rodabe Ravash
Abstract
The present experiment has compared the resistance of different mycorrhizal pistachio rootstocks to salinity and drought stress in a completely randomized design with three replications. It has used Funneliformis mosseae and four pistachio species, Badami-e Riz Zarand, Qazvini, Sarakhs, and UCB1. In ...
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The present experiment has compared the resistance of different mycorrhizal pistachio rootstocks to salinity and drought stress in a completely randomized design with three replications. It has used Funneliformis mosseae and four pistachio species, Badami-e Riz Zarand, Qazvini, Sarakhs, and UCB1. In addition, the experiment of water stress in 4 levels (100%, 80%, 60%, and 40% FC), and experiment of salinity stress in 4 levels (0.91, 7.57, 16.12, and 24.63 dSm-1), have been applied for 60 days. At the end of the experiment, different characteristics such as total biomass, leaf area, tissue moisture percentage, and electrolyte leakage have been measured. Also, during the experiment, total chlorophyll, carotenoids and anthocyanin pigments have been surveyed and analyzed. The results indicate that mycorrhizal symbiosis has improved total biomass and leaf moisture content under both drought and salinity stress conditions, wherein tissue moisture content and total leaf chlorophyll content have decreased and anthocyanin content and electrolyte leakage increased. As for the lowest leaf, stem and root moisture content have been observed at the highest drought and salinity levels with UCB1 having the highest biomass and moisture under salinity stress and the highest leaf and stem moisture content and lowest electrolyte leakage are observed in Sarakhs rootstock under drought stress. It seems UCB1 and Sarakhs symbiotic with mycorrhiza can be useful for salinity and drought stress, respectively.
Mehri Mashayekhi; Fariborz Habibi; Mohamad Amiri
Abstract
Mechanisms of drought stress tolerance of GF677 rootstock, peach and almond hybrid, (Prunus persica × Prunus amygdalus) were studied under in vitro conditions. Plantlets of GF677 rootstock were subcultured into the Murashige and Skoog (MS) solid proliferation medium containing 1 mg/l BA (6-Benzyladenine) ...
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Mechanisms of drought stress tolerance of GF677 rootstock, peach and almond hybrid, (Prunus persica × Prunus amygdalus) were studied under in vitro conditions. Plantlets of GF677 rootstock were subcultured into the Murashige and Skoog (MS) solid proliferation medium containing 1 mg/l BA (6-Benzyladenine) and 0.1 mg/l NAA (naphthaline acetic acid) in four drought stress levels 0 (control), 10, 20 and 30 g/l polyethylene glycol 6000 (corresponding to osmotic potentials 0, -0.2, -0.4 and -0.6 Mpa, respectively). After six weeks results showed that induced drought stress had a significant effect on measured parameters. By increasing drought levels in the culture medium, antioxidant enzymes activity (catalase and peroxidase), total protein content and proline content significantly increased; meanwhile soluble sugars had non-significant increasing in the different levels of drought. According to the results it can be concluded that, the most important mechanisms of drought tolerance of GF677 rootstock under in vitro conditions are the use of antioxidant defense system, increasing protein synthesis (enhancing genes expression) and proline accumulation and osmoregulation by soluble sugars had less important.
Fatemeh Mirzaei; Mohammad Rafieiolhossaini; Nafiseh Rangzan; Mahdi Amirusefi
Abstract
Objective: Quinoa, with its high nutritional value, is highly resistant to a wide range of non-biological stresses. Despite the limited resources and the increasing demand for food products in lands with low or limited fertility, it can be cultivated well and produces a good product.
Methods: This experiment ...
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Objective: Quinoa, with its high nutritional value, is highly resistant to a wide range of non-biological stresses. Despite the limited resources and the increasing demand for food products in lands with low or limited fertility, it can be cultivated well and produces a good product.
Methods: This experiment was conducted with the aim of investigating the simultaneous effect of drought stress and heavy metals on the quinoa plant, in a factorial format in a completely randomized design with 3 replications. The first component involved two levels of soil (contaminated and uncontaminated), and the second factor, three levels of drought stress (100% of field capacity 60% of field capacity, and 30% of field capacity).
Results: Interaction effect of soil type and drought stress was significant on all traits except the fresh weight of shoot and plant height. The lowest amount of fresh and dry weight of roots, dry weight of shoot and weight of thousand seeds was observed in contaminated soil with severe drought stress. Nevertheless, the weight of 1000 quinoa seeds under the influence of moderate drought stress was not significantly different from the condition without drought stress. Examining the simple effects showed that soil contamination with heavy metals caused a decrease of 13.7% in fresh weight of shoot and 30.5% decrease in dry weight of shoot compared to plants grown in uncontaminated soil.
Conclusion: In general, it can be stated that the increase in drought stress has significantly reduced root fresh weight and 1000 seed weight in quinoa, but the percentage and ratio of this reduction in soil contaminated with heavy metals was much higher than that of non-contaminated soil. According to the results of this research, the cultivation of quinoa can be investigated as a promising plant in soils with similar limitations.
Safoura Kazemi; Rahim Barzegar; Abd-Alrahman Mohammadkhani
Abstract
The present investigation was carried out to evaluate the effect of vermivash on yield and leaf nutrient status of strawberry "Govieta" at research greenhouse of Shahrekord University in 2013. Treatments were included control (without vermiwash foliar spray) and different concentration of vermiwash (10, ...
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The present investigation was carried out to evaluate the effect of vermivash on yield and leaf nutrient status of strawberry "Govieta" at research greenhouse of Shahrekord University in 2013. Treatments were included control (without vermiwash foliar spray) and different concentration of vermiwash (10, 15 and 25 percent) that spryed at 1, 2 and 3 weeks interval. Vermiwash was extracted from cow manure vermicompost through earthworm Eisenia foetida. The experiment was conducted in completely randomized design (CRD) with three replications. The results showed that there was significant difference between vermiwash treatments and control for the leaf elements of N, K and Fe, but was not significant for the other macro and microelements. Leaf Fe concentration increased up to excessive level in 25 percent concentration with weekly interval. Foliar spray of 25, 15 and 10 percent vermiwash with two-weeks intervals considerably enhanced the number of fruit and yield per plant, but decreaced fruit weigth average a little. Increasing the yield per plant ranged between 24 and 68g for various vermiwash treatments in comparison with control. Vermiwash treatments had no effect on inflorescence number per plant and flower number per inflorescence. Foliar spray of 15 and 10 percent vermiwash with two-weeks interval improved the yield of strawberry "Govita".
Masoumeh Ghahremani; Ali Ebadi; ghasem parmoon; Soodabeh Jahanbakhsh
Abstract
This study was carried out to evaluate the changes in some important cell parameters under water limitation in sorghum genotypes. A factorial experiment was conducted based on randomized completely design in greenhouse, in University of Mohaghegh Ardabili in 2014. Treatments were water stress at levels ...
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This study was carried out to evaluate the changes in some important cell parameters under water limitation in sorghum genotypes. A factorial experiment was conducted based on randomized completely design in greenhouse, in University of Mohaghegh Ardabili in 2014. Treatments were water stress at levels of 85, 65, 45 and 25 percent field capacity in and three genotypes of forage sorghum (KFS2, KFS6 and KFS17). The results showed that water stress reduced the osmotic potential, relative water content, cell membrane stability redecase in one percent, also the amount of potassium, calcium, phosphorus, while increased sodium content and finaly decreased biomass. Interaction between stress and genotype only proline, soluble sugars, cell membrane stability, relative water content and biomass was statistical difference. KFS2 genotype had the highest amounts of proline, soluble sugars and nutrients, higher osmotic potential, relative water content, cell membrane stability and biomass in most severe stress levels (25 percent of field capacity). The highest contribution between proline and calcium amount for osmotic potential and membrane stability prediction. These factors also play an important role in biomass production. In general we can say the genotypes used for different mechanisms to deal with stress, however, the genotypes which use faster and less expensive methods are able to have greater tolerance to stress and will a higher yield produce.
Gholamhasan Movahed; Nima Ahmadi; Ahmad Moieni
Abstract
In order to evaluate the responses of two ecotypes of Damask rose (Rosa damascena) to exogenous ethylene, an experiment was conducted based on a completely randomized design (CRD) at the laboratory of Postharvest Physiology, Tarbiat Modares University, Tehran, Iran. Damsk rose cut stems containg flower ...
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In order to evaluate the responses of two ecotypes of Damask rose (Rosa damascena) to exogenous ethylene, an experiment was conducted based on a completely randomized design (CRD) at the laboratory of Postharvest Physiology, Tarbiat Modares University, Tehran, Iran. Damsk rose cut stems containg flower buds and/or open flowers, single buds, or multiple flowers were exposed to exogenous ethylene for 24 h. Plant organs were placed into hearmatically seald glass chambers, where ethylen was injected, to achieve 0, 1, 2, 3, and 4 µl/l concentrations. Biocehmival characteristics, enzyme activities and morphological characteristics including flower life, contents of anthocyanin, flavonoide, and proline were determind in Kashan and Azaran ecotypes of Damask rose. The lowest psotharvest life was observed at 3 and 4 μl concentration of ethylene and the highest abscission was observed in Azaran ecotypes at a concentration of 4 μl/l of ethylene after four days. Anthocyanin and proline content and catalase activity reduced in both ecotypes studied. For both ecotypes, the lowest content of anthocyanin, proline and the lowest catalase activity (48/77 ΔA 240/mg protein) were observed in those treated with ethylene at 4 µl/l. The highest malondialdehyde (3.63 µmol/g petal fresh weight) was found in Azaran ecotype flowers treated with 4 µl/l ethylene concentration. Decrease of total protein in Kashan flowers (0.32 mg/g fresh petal) was much less than that in Azaran flowers (0.2 mg/g fresh petal). Based on these results, Kashan could be recommended as a tolerant ecotype to be used in breeding programs.
Raouf Seyed sharif; reza seyed sharifi; Hamed Narimani
Abstract
In order to study the effect of methanol and seed inoculation with plant growth promoting rhizobacteria on grain filling components, chlorophyll content and grain yield of safflower (Carthamus tinctorius L.) under various irrigation levels, a factorial experiment has been conducted based on randomized ...
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In order to study the effect of methanol and seed inoculation with plant growth promoting rhizobacteria on grain filling components, chlorophyll content and grain yield of safflower (Carthamus tinctorius L.) under various irrigation levels, a factorial experiment has been conducted based on randomized complete block design with three replications at the research farm of University of Mohaghegh Ardabili in 2020. The experimental factors include irrigation (full irrigation as control, irrigation withholding at 50% heading-bud, and flowering stages), biofertilizers application (no application as control, seed inoculation with Flavobacterium, Pseudomonas and both application of Flavobacterium and Pseudomonas), and methanol foliar application: (foliar application with water as control and foliar application with 10% and 20% volume of methanol). The results show that the content chlorophyll a (41.57%), b (74.59%) and total chlorophyll (49.33%), grain filling period, and effective grain filling period (27.32% and 72.89% respectively) and grain yield (69.2%) have increased under full irrigation condition, foliar application 20% volume of methanol, and both application of Flavobacterium with Pseudomonas in comparison with irrigation withholding at 50% heading-bud and no application of biofertilizers and methanol. Generally, the results show that application of plant growth-promoting bacteria and methanol can increase grain yield of safflower by improving chlorophyll content and grain filling components under water limitation condition.
mohsen zafaranieh
Abstract
In order to evaluate the effects of planting date and plant density on phenology, seed yield, and essential oil quality of Guar, an experiment has been conducted during 2018-2019 and 2019-2020 growing seasons. It is a split plot layout based on a randomized complete block design with three replications. ...
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In order to evaluate the effects of planting date and plant density on phenology, seed yield, and essential oil quality of Guar, an experiment has been conducted during 2018-2019 and 2019-2020 growing seasons. It is a split plot layout based on a randomized complete block design with three replications. Different planting dates are considered as the main factor, including September 5th to February 5th as monthly. Three plant densities are considered as sub-factor (20, 40, and 60 plants in a square meter). The required growing degree- day (GDD) from sowing to physiological maturity ranges between 1802.3 and 2347.9 °d on different planting dates. The highest GDD from sowing to physiological maturity is observed on May 5th. The highest seed yield (3780 kg / ha) and galactomannan yield (1050 kg / ha), 100- seed weight (3.5 g), and oil percentage (17.9%) belong to May 5th + 40 plants per m2. by delaying planting time, 100- seed weight causes oil percentage to drop and the seed yield (40%), galactomannan (68%) and the oil percentage (15%) are observed in September. Therefore, it seems that the best time and density for planting Alyssum is May 5th with a density of 40 plants per m2.
Samaneh Zadehparizi; Ahmad Tajabadi Pour; Isa Esfandiarpoor
Abstract
Potassium is a very important plant nutrient not only because of its large demand, but also because of its important physiological and biological functions in plant. Therefore, understanding of soil potassium status can lead to better use of potassium fertilizers. This study was done to evaluate 10 extractants ...
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Potassium is a very important plant nutrient not only because of its large demand, but also because of its important physiological and biological functions in plant. Therefore, understanding of soil potassium status can lead to better use of potassium fertilizers. This study was done to evaluate 10 extractants for estimating available potassium for pistachio in 28 calcareous soils of Rafsanjan in a completely randomized design with three replications in greenhouse conditions in Vali-e-Asr university of Rafsanjan in 2014. Potassium was extracted by 1 M NH4OAc, 0.01 M CaCl2,2 M NaCl, 0.1 M HNO3, boiling 1 M HNO3, distilled water, 1M NaOAc, Mehlich1, Mehlich3 and DTPA-NH4HcO3.The results showed that extraction of K decreased in the order: boiling 1 M HNO3> 2 M NaCl > 1M NaOAc > Mehlich3> 1 M NH4OAc > 0.1 M HNO3> DTPA-NH4HcO3> Mehlich1> 0.01 M CaCl2> distilled water. 1M NaOAc was selected as the most suitable extractant for potassium in calcareous soils of Rafsanjan on its high correlation with leaf and shoot K concentration. Multiple regression equations indicated that potassium extracted from the soil dependent to different physical and chemical properties of soil such as amount of clay and cation exchange capacity.
Vahideh Khalegh nejhad; farhad jabbari
Abstract
This experiment was carried out to evaluate the effect of Rhizobium strains and plant growth promoting Rhizobacteria(PGPR) on yield and yield components of chickpea (Cicer arientinum L.) Arman cultivar. This research was conducted as split plot based on randomized complete block design at Zanjan university ...
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This experiment was carried out to evaluate the effect of Rhizobium strains and plant growth promoting Rhizobacteria(PGPR) on yield and yield components of chickpea (Cicer arientinum L.) Arman cultivar. This research was conducted as split plot based on randomized complete block design at Zanjan university researchal farm. Irrigation levels(optimum irrigation during season growth and no irrigation during growth period) were set as main plots and fertilizer level(control or no application chemical and biological fertilizer, 50kg/ha Urea, seed inoculation with Mesorhizobium ciceri strain of SWRI-3,seed inoculation with Mesorhizobium ciceri strain SWRI-17, seed inoculation with PGPR,Co-inoculation with rhizobium strains SWRI-3+SWRI-17 and Co-inoculation with all biofertilizer , PGPR+SWRI-3+SWRI-17) were sets as subplots. The results of this study showed that drought stress reduced plant height, number of branches, number of seeds per plant, seed weight, biological yield and harvest index.Applicatin of biofertilizers because of positive effects on plant height, number of seeds per plant, seed weight, pod weight per plant and biological yield,produced more grain yield in comparison control and nitrogen urea fertilizer in both of arrigated and rainfed conditions.In addition ,seed co-inoculation with all of bio-fertilizers(PGPR+SWRI-3+SWRI-17) achieved more grain yield in comparison separate inoculation about 18-36% in irrigated and 34-50% in rainfed conditions.
Ali Mansouri rad; Ali Nakhzari Moghadam; Afshin Soltani; Ali Rahemi Karizaki; Benyamin Torabi
Abstract
One of the main problems of soybean production in the east region of Golestan, Iran is considerable difference between actual yield and attainable yield which is called yield gap. In recent years, this gap has been impressive, and therefore, identifying soybean yield-limiting factors is essentially needed. ...
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One of the main problems of soybean production in the east region of Golestan, Iran is considerable difference between actual yield and attainable yield which is called yield gap. In recent years, this gap has been impressive, and therefore, identifying soybean yield-limiting factors is essentially needed. The present study was conducted based on CPA method in 73 fields of Kalaleh )Golestan, Iran) in 2016. In this study all information related about management practices, soil characteristics and farmer socio-economic status were measured and recorded. Then, using stepwise regression, the relationship between variables and yield was considered. The results showed that there is a 2606.4 kg/ha difference (gap) between actual yield (average farmers' yield) and attainable yield (maximum farmers' yield). It was identified that farming experience, burying plant residues in the soil, planting date, Sprinkler irrigation, the amount of used water and plant density were contributed to yield gap, 30.1, 5.1, 14.7, 13.8, 13.8 and 22.5%, respectively. It could be concluded that improving these factors will increase the yield up to 1802.9 kg/ha.
Hasan Mosapour Yahyaabadi; Mohammad Reza Asgharipour
Abstract
In this study, the effect of drought and different concentrations of silicon was examined on seed yield, essential oil percentage and physio-chemicals properties in fennel plant. The experimental design was a split plot with three irrigation regimes: irrigation at 100, 70 and 40 percent of FC comprising ...
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In this study, the effect of drought and different concentrations of silicon was examined on seed yield, essential oil percentage and physio-chemicals properties in fennel plant. The experimental design was a split plot with three irrigation regimes: irrigation at 100, 70 and 40 percent of FC comprising the main treatments, and five levels of silicon foliar sprays (0, 2.5, 5, 7.5 and 10 mM) as sub-treatments that were applied with three replications. The experiment was conducted in 2014 at the Zabol University research farm in Zabol, south Iran. Limited irrigation significantly decreased chlorophyll, carotenoids, leaf relative water content, while electrolyte leakage showed a 2 -fold increase over the control. In limited irrigation conditions 7.5 mM silicon increased relative water content, chlorophyll, antocianine, proline and soluble sugare by 38, 30, 38, 12 and 22 percent, respectively, while decreased electrolyte leakage by 28 perent over the control. These results suggested that silicon spraying by photosynthetic pigments and soluble osmolytes increasing could increase the ability of plants to drought stress, and in this way increased seed yield by 61 percent under severe stress conditions.
hamzeh mirzaie; Farid Shekari; reza fotovat; mohammad amir delavar
Abstract
Investigating the effect of various sources of sulfurous compounds along with the inoculation of Thiobacillus bacteria on corn plants under stress conditions of lead and zinc metals, Factorial experiment of randomized complete blocks design was carried out in the Agricultural Research Greenhouse of Zanjan ...
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Investigating the effect of various sources of sulfurous compounds along with the inoculation of Thiobacillus bacteria on corn plants under stress conditions of lead and zinc metals, Factorial experiment of randomized complete blocks design was carried out in the Agricultural Research Greenhouse of Zanjan University in 2021. The treatments include elemental sulfur (0.75, 1.25 and 2 g/kg soil), sulfur with thiobacillus bacteria(biosulfur) (1, 2 and 3 g/kg soil) and potassium sulfate (0.5, 1 and 1.5 g/kg soil). The results showed traits were significant in the vegetative growth stage in all applied treatments. The treatments increased the amount of chlorophyll, enzymes compared to the control. Then decreased the leaf temperature, Increasing the length of leaf cells. also, it increases the leaf area and leaf production rate in plants. This increase was higher in sulfur treatment with bacteria. But the treatments of 2 grams of elemental sulfur and 1.5 grams of potassium sulfate caused stress in the plant and reduced the amount of traits compared to the control. Also, the plants in contaminated soil were stressed and the amount of the mentioned traits also decreased. However, with the application of treatments, the amount of carotenoid, total protein and peroxidase traits increased, which reduced the stress in plants and increased the amount of traits and growth indicators compared to control in contaminated soil. Sulfur treatment with bacteria, compared to other applied treatments, by activating the enzymatic and non-enzymatic defense system of the plant, causes the plant to tolerate stress and improve plant growth.
Hosna Fayazi; Ebrahim Zeinali; Afshin Soltani; Benyamin Torabi
Abstract
Global climate change is among the most important agricultural and food security challenges. This study tries to investigate the effect of climate change on potential yield and water productivity of forage maize (Zea mays L.) in Iran. Two scenarios of RCP4.5 and RCP8.5 are used to predict the future ...
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Global climate change is among the most important agricultural and food security challenges. This study tries to investigate the effect of climate change on potential yield and water productivity of forage maize (Zea mays L.) in Iran. Two scenarios of RCP4.5 and RCP8.5 are used to predict the future climate (2050s) and climate data of 2001-2015 have been used as the base period. Potential yield is estimated using SSM-iCrop2 model according to the GYGA protocol and the climate changes for both scenarios are applied in the model. The results show that the climate change will not have a considerable effect on forage maize yield compared to the current conditions (85.6 ton ha-1) and will only lead to an increase of 0.9% and 1.6% in on both scenarios, respectively. This may be attributed to maize being a C4 plant and thus non-effectiveness of CO2 increase on its growth. Also, the temperature will remain in optimum range for maize in most of the main regions for forage maize cultivation areas in Iran. Water productivity in both scenarios will increase by 0.4% and 1.6%, compared to current conditions (10.4 kg m-3), respectively, which may be due to increased CO2 concentration and more closure of stomata. Also, improved water productivity in forage maize may be attributed to increase yield potential due to the fact that no considerable changes are observed in terms of the required water, evapotranspiration and irrigation times.
Mohammad Reza Mansouri Vajari; Ebrahim Zeinali; Afshin Soltani; Benjamin Torabi; Alireza Nehbandani
Abstract
Objective: The present study was conducted in order to estimate the yield gap of faba bean in the main production areas of this plant in Golestan province, including Gorgan, Ali Abadkatol and Aq Qola cities, and to identify the factors that cause it and determine the contribution of each of them.
Methods: ...
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Objective: The present study was conducted in order to estimate the yield gap of faba bean in the main production areas of this plant in Golestan province, including Gorgan, Ali Abadkatol and Aq Qola cities, and to identify the factors that cause it and determine the contribution of each of them.
Methods: Based on this, the information related to the production management of 445 faba bean farms in Gorgan, Aliabadkatol and Aqqola regions in 1398-1399 and 1399-1400 was collected and the yield gap was estimated using the comparative performance analysis (CPA) method.
Results: The average, maximum, and gap yield of faba bean seeds were 2742, 4000, and 1258 kg per hectare, respectively. Also, based on the results obtained, the most important reasons for the yield gap and the contribution of each of them in creating the yield gap were: planting date 21%, pests 15 percent, the amount of pure nitrogen (N) 14 percent, the number of disc times 14 percent, the amount of seed used 12 percent, diseases 12 percent, waterlogging 5 percent, weeds 3 percent, non-use of working row 2 percent and improper planting depth 1 percent.
Conclusion: In general, by optimizing the management of faba bean production and eliminating the mentioned factors of yield gap, it is possible to increase the yield of faba bean in the regions of Gorgan, Ali Abadkatol and Aq Qala of Golestan province by 46 percent (equal to 1258 kg per hectare) compared to the current amount increased.
Somaye Amraee Tabar; Ahmad Ershadi; Tahmine Robati
Abstract
This study was performed to investigate the effect of Putrescine and Spermine on some physiological and biochemical characteristics and antioxidant enzymes activity of peach (Prunus persica cv. Alberta) and almond (Prunus dulcis cv. Rabi) seedlings under water deficit. The first factor was water regime ...
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This study was performed to investigate the effect of Putrescine and Spermine on some physiological and biochemical characteristics and antioxidant enzymes activity of peach (Prunus persica cv. Alberta) and almond (Prunus dulcis cv. Rabi) seedlings under water deficit. The first factor was water regime at two levels (80% or 50% of soil available water), and the second factor was polyamine treatments (putrescine 0.1, putrescine 1, spermine 0.1, spermine 1 mM and control). Water deficit led to increased electrolyte leakage percentage in peach leaves, compared to almond. Under water deficit, polyamines reduced electrolyte leakage in both plants, Spermine was more effective than Putrescine under water deficit. Leaf contents of soluble carbohydrates, proline and soluble proteins in almond more increased as compared to peach. Spermine more effectively increased concentration of osmoregulants, compared to Putrescine. Under water deficit, the activities of catalase, guaiacol peroxidase and ascorbate peroxidase enzymes increased in both plants, higher enzyme activity was found in almond leaves in comparison with peach. The maximum antioxidant enzyme activity was found following spermine treatments. Application of spermine and putrescine increased drought tolerance in almond and peach through reducing the electrolyte leakage, increasing compatibility osmolytes and antioxidant enzyme activity.
Reza Poorsatari; Shahryar Dashti; Sirous Hasan Nejad
Abstract
Weed identification and their distribution are the most important principals to weed managements. Therefore, the weeds of chickpea fields in rain-fed areas of Maragheh, North west Iran, were systematically sampled and the traits of species distribution, life cycle, canopy, species diversity and similarity ...
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Weed identification and their distribution are the most important principals to weed managements. Therefore, the weeds of chickpea fields in rain-fed areas of Maragheh, North west Iran, were systematically sampled and the traits of species distribution, life cycle, canopy, species diversity and similarity indices were studied. Convolvulus arvensis, Cardaria draba, Sophora alopecuroides, Acroptilon repens, Tragopogon graminifolius, Euphorbia helioscopia, Geranium tuberosum and Falcaria vulgaris had a high frequency among the weeds. Also diversity, uniformity and dominance of weed population were evaluated via Shannon-Wiener index and similarities and differences between various regions based on species diversity were evaluated using Sorensen - and Jaccard indices. Among the studied areas, the highest and lowest richness index was belonged to Khodajo (44 species) and Khorma Zard (28 species), respectively, whereas, the regions had the equal Shanon-Winener diversity index. Tragopogon graminifolius, Convolvulus arvensis and Galium tricornutum with relative dominance indices of 38.82, 32.92 and 28.39 respectively, were detected as dominant weeds in Maragheh chickpea fields.
Behnam Kamkar; Ommolbanin Gorzin; nafiseh khalili; mohammadhosein ghorbani
Abstract
Almolookhiyeh (Corchorus olitorius L.) known in the world as a valuable medicinal plant that was produced for the first time in Iran in 2011. This study was aimed to quantify germination response of Almolookhiyeh to temperature. For this purpose, seeds were exposed to different constant temperatures ...
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Almolookhiyeh (Corchorus olitorius L.) known in the world as a valuable medicinal plant that was produced for the first time in Iran in 2011. This study was aimed to quantify germination response of Almolookhiyeh to temperature. For this purpose, seeds were exposed to different constant temperatures (10 ,15, 20, 25, 30, 35, 40, 45 and 50°C) in Seed Research Lab, Gorgan University of Agricultural Sciences and Natural Resources in 2011. Results showed that the effect of temperature on the maximum germination percentage (MGP), germination rate (R50), germination uniformity (GU), and time to 10, 50 and 90 percent germination as (D10), (D50) and (D90), the percentage of normal seedlings (NS%) and seedling length (LS) was highly significant. Assessment of three nonlinear regression models including segmented, dent-like and beta models based on 10, 50 and 90 percent germination revealed that beta model was superior to other models. Based on the superior model (Beta), base, optimum and ceiling temperatures were estimated as 10.18, 37.31 and 50°C, respectively. Biological hours also were calculated as 13.56 hours. Using beta model to regress seedling length against temperature and normal seedling percentage versus temperature showed that seedling emergence, the maximum seedling length and the highest normal seedling percentage were occurred at 11 to 44, 35.34 and 31°C, respectively.
Abdolhamid Zahedian; Abolhossein Aboutalebi Jahromi; Abdolrasol Zakerin; Vahid Abdoosi; Ali Mohammadi Torkashvand
Abstract
In order to study the effect of different irrigation regimes, and application of biological and chemical fertilizers on morphological characteristics, antioxidant enzyme activity, and sugar content of melon fruit cv. Ahlam, an experimental split-factorial plots has been done in a randomized complete ...
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In order to study the effect of different irrigation regimes, and application of biological and chemical fertilizers on morphological characteristics, antioxidant enzyme activity, and sugar content of melon fruit cv. Ahlam, an experimental split-factorial plots has been done in a randomized complete block design with three replications in Khuonj County in 2018-19. The main factor has been irrigation at 3 levels including 50%, 75%, and 100% of water requirement, with the sub-factor including NPK chemical fertilizer at 0, 60, 120, and 180 kg/ha as well as non-application of Nitroxin biofertilizer along with application of 100% of the recommended amount. Results show that different irrigation regimes, different fertilizer treatments, and their interaction have had a significant effect on some of the studied traits. The combined application of chemical fertilizers with biofertilizers show a significant effect on the number of sub-branches, total plant weight, length and diameter of the most branch, total soluble solids (TSS), the quantity of xylose and fructose sugars and activity of catalase, superoxide dismutase, and peroxidase enzymes. The highest number of sub-branches and plant fresh weight, branch length and diameter are obtained in the chemical fertilizer treatment of 120, and 180 kg/ha with the utilization of Nitroxin fertilizer under 100% water stress. However, it has been observed that biofertilizers has had no significant effect on sugars and enzyme activity in fruit, so that the very best levels of catalase, superoxide dismutase, and peroxidase are obtained within the treatment of 50% of field capacity with 120 and 180 kg/ha of chemical fertilizer without using Nitroxin. In general, it can be concluded that the application of biofertilizers reduce the adverse effects of water stress and the application of chemical fertilizers with biofertilizers hasa significant impact on increasing the studied traits.
Khadijeh Shahsavarpour Lendeh; Hemmatollah Pirdashti; Esmaeil Bakhshandeh
Abstract
In order to investigate the effect of a native plant growth promoting bacteria (Enterobacter sp.) on some vegetative characteristics and paddy yield of rice(cv. ‘Tarom Hashemi’), a field experiment was carried out in Babol (Aghamalek village) at 2016. This experiment was arranged in split ...
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In order to investigate the effect of a native plant growth promoting bacteria (Enterobacter sp.) on some vegetative characteristics and paddy yield of rice(cv. ‘Tarom Hashemi’), a field experiment was carried out in Babol (Aghamalek village) at 2016. This experiment was arranged in split plots based on a randomized complete block design with three replications. Six levels of potassium sulfate fertilizer (PSF: 0, 25, 50, 75, 100 and 125 kg ha-1) were used as the main plots and four levels of inoculations (non-inoculation as control, seed inoculation in the seedbed condition, seedling root inoculation before transplanting time and combined both previously methods) served as the sub-plots. The results indicated that various methods of inoculation increased plant height (1.25-2.54%), tillers number per hill (TNH; 11.7-16.5%), total leaves number per hill (TLN; 12.5-14.2%), leaf area index (LAI; 7.16-17.9%) and paddy yield (PY; 14.6-19.8%) of rice and the occurring of anthesis stage were about one day sooner as compared to the control condition. In this experiment, the studied traits significantly influenced by PSF and various methods of inoculation, but the interaction effect between them were not significant. Among inoculation methods, the combined method was better than others. In addition, the values of all studied traits such as PH, TNH, TLN, LAI and PY (18.2% more than the control) increased as PSF increased from zero to 125 kg ha-1. Consequently, the application of Enterobacter sp. and PSF through improved the vegetative characteristics, particularly in LAI, TNH and TLN, resulted to increase in the radiation interception capacity, photosynthetic efficiency and improved PY of rice.