ali ashori; Manoochehr Gholipoor; Ahmad Gholami; Hamid Abbasdokht
Abstract
Objective: The effect of magnetic and superabsorbent water was investigated on some morphophysiological traits and performance of cumin under a low irrigation regime.Methods: An experiment was conducted in the agricultural year of 1399-1400 in the research fields of the Faculty of Agriculture of Shahrood ...
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Objective: The effect of magnetic and superabsorbent water was investigated on some morphophysiological traits and performance of cumin under a low irrigation regime.Methods: An experiment was conducted in the agricultural year of 1399-1400 in the research fields of the Faculty of Agriculture of Shahrood University of Technology in two districts of Rahnjan and Garman of Shahrood city in a factorial format in the form of a randomized complete block design with three repetitions. Irrigation water type treatment at two levels (normal and magnetic) and locations (Rahanjan, Garman) with different climatic conditions and altitude above sea level as the main factor and superabsorbent treatment at three levels (zero, 100 and 200 kg/ha) as a secondary factor. Was considered. In all treatments, irrigation was applied based on 100% of plant water needs.Results: The results showed location, type of irrigation and different concentrations of superabsorbent had a positive and significant effect on the growth characteristics. In the Rahnjan region, due to the climatic conditions and higher average annual temperature and the treatment of 100 and 200 kg/ha of superabsorbent and the use of magnetic water, the highest amount of plant height, percentage and yield of essential oil and protein, soluble carbohydrates were observed.Conclusion: According to the results, most of the traits in the Rahnjan region had higher values than in the German region, and plant cultivation in the Rahnjan region is economical.
tayebe rostami; hamid abbasdokht; hassan makarian; Manoochehr Gholipoor; khalil karimzadehasl
Abstract
Objective: This study aimed at assessing the effects of mycorrhiza and phosphorus fertilizer on morphophysiological traits and yield of quinoa (Chenopodium quinoa Willd.) and maize (Zea mays L.) in an intercropping system by using of replacement method.Methods: A complete randomized block design (CRBD), ...
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Objective: This study aimed at assessing the effects of mycorrhiza and phosphorus fertilizer on morphophysiological traits and yield of quinoa (Chenopodium quinoa Willd.) and maize (Zea mays L.) in an intercropping system by using of replacement method.Methods: A complete randomized block design (CRBD), with three replications was implemented at two research farms affiliated with Shahrood University of Technology, located in Shahrood and Miami cities. The intercropping systems consisted of five cropping ratios: pure quinoa and maize cultivation, 75% quinoa + 25% maize, 50% quinoa + 50% maize, 25% quinoa + 75% maize. The first factor and phosphorus at three levels (zero, 50 and 100 kgha-1) and mycorrhiza at two levels (use and unuse) were considered as the second and third factors.Results: The results demonstrated that most of studied traits were significantly influenced by the intercropping systems, mycorrhiza application, and phosphorus concentrations. The highest plant height in maize (202.8 cm) and quinoa (81.3 cm) was obtained by use of mycorrhiza and phosphorus fertilizer 50 kgha-1. Similarly, the highest leaf area index in quinoa (86.2) and maize (6.57) amount of chlorophyll in quinoa and maize respectively (2.88 and 12.39 mg/ml) were obtained in Shahrood region by using mycorrhiza and 50 kgha-1 phosphorus fertilizer in cropping ratio 50 %.Conclusion: According to the results, the effects of different intercropping ratio, use of mycorrhiza, and phosphorus fertilizers had a significant impact on the morphophysiological characteristics of quinoa and maize.
Mojdeh Sadat Khayat Moghadam; Ahmad Gholami; Amir Hossein Shirani rad; Mahdi BaradaranFiroozabadi; Hamid Abbasdokht
Abstract
In order to study the effects of late-season drought stress and foliar application of potassium silicate on yield and yield components of spring genotypes of canola, a factorial split-plot experiment is conducted in Karaj, Iran in a randomized complete block configuration with three replications for ...
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In order to study the effects of late-season drought stress and foliar application of potassium silicate on yield and yield components of spring genotypes of canola, a factorial split-plot experiment is conducted in Karaj, Iran in a randomized complete block configuration with three replications for two years of cultivation (2016-2018). The irrigation is performed at two levels in this study, including routine irrigation (control) and interruption of irrigation from the pod formation stage. Potassium silicate foliar application at two levels is comprised of 0 and 4 g liter-1 in factorial status in main plots and five Brassica napus L. genotypes including OG×AL, RGS×SLM, DALGAN, RGS003 and RGS×Okapi in subplots. The results show that the measured properties are affected by the applied treatments. Full irrigation with foliar application in OG×AL genotype results in highest seed yield (5620 Kg/ha) and total chlorophyll content (1.71 mg/g.FW) increase stomatal resistance, leaf proline, leaf soluble and carbohydrates, decreasing total chlorophyll content and relative leaf water content. Under drought stress conditions, DALGAN and RGS× SLM genotypes have higher yield, which indicates its better performance under stress conditions. Finally, our research demonstrates Potassium Silicate's beneficial effects in improving the drought tolerance of canola plants, particularly at the end of the season. Our study will act as a foundation for any attempt in new approaches to mitigate drought damage, establishing a functional connection between the position of potassium silicate, physiological response, and drought stress tolerance in canola plants.
sahar keramati; Ahmad Gholami; Mehdi Baradaran; Hamid Abbasdokht
Abstract
In order to investigate the role of foliar application of yeast extract on physiological and Biochemical properties of cowpea (Vigna sinensis L.) under drought stress conditions, a factorial experiment has been conducted as a randomized complete block design with three replications in Agriculture Campus ...
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In order to investigate the role of foliar application of yeast extract on physiological and Biochemical properties of cowpea (Vigna sinensis L.) under drought stress conditions, a factorial experiment has been conducted as a randomized complete block design with three replications in Agriculture Campus of Shahrood University of Technology (located in Bastam) during 2017 under drought stress and foliar application of yeast extract. Drought stress involves two stages of 50 present flowering and 50 present pod formation with control treatment (without irrigation interruption). Foliar application of yeast extract (two, four, six g/L, and control) are repeated twice with a seven-day interval, with the first one being 30 days after planting. Results show that drought stress has decreased relative water content of leaves. In contrast, relative water content (5.82%), proline content (30.74%), leaf flavonoid (83%), nitrogen (3.82%), phosphorus (22.22%), and potassium (43%) are among the traits that have increased with the use of yeast extract, compared to the control. Six g / L of the yeast extract has increased grain yield (1.02 t ha-1), leaf anthocyanin (0.072 mg /g fresh weight), and proline (31.62 mg /g fresh weight). It can be said that a concentration of six g/L of yeast extract can be useful to reduce the severity of drought stress. The yeast extract can act as an ecological strategy to improve the defensive response against environmental stresses.
Ali Ehsani pour; Hamid Abbasdokht; Manoochehr Gholipoor; Alireza Abdali Mashhadi
Abstract
In order to evaluate the water productivity, stem height and diameter, root dry weight, brix percentage of sugarcane, an experiment was conducted in a randomized complete block design with 14 treatments and four replications during 2016-17 at two locations in Ahwaz. The treatments were: sole sugarcane, ...
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In order to evaluate the water productivity, stem height and diameter, root dry weight, brix percentage of sugarcane, an experiment was conducted in a randomized complete block design with 14 treatments and four replications during 2016-17 at two locations in Ahwaz. The treatments were: sole sugarcane, sole soybean, sole cowpea, sole soybean+ rhizobium, sole cowpea+rhizobium, sole sugarcane+mycorrhizal, intercropping sugarcane with cowpea, intercropping sugarcane with soybean, intercropping sugarcane with cowpea+rhizobium, intercropping sugarcane with soybean + rhizobium, intercropping sugarcane+mycorrhizal and cowpea, intercropping sugarcane+mycorrhizal and soybean, intercropping sugarcane+mycorrhizal and soybean+rhizobium and intercropping sugarcane + mycorrhizal and cowpea +rhizobium. The results showed that the highest water productivity, the highest sugarcane stem height, the largest diameter in the middle of the stem and at the bottom of the stem, the highest dry weight roots and the highest brix percentage of sugarcane stem extract were related to intercropped sugarcane + mycorrhizal and cowpea+ rhizobium treatment. which was 31.61, 16.14, 32.42, 28.35, 8.89, and 8.31% higher than sole sugarcane. Mycorrhizal symbiosis was positive in sugarcane, and when mycorrhizal fungi and cowpea were present simultaneously in a treatment, their synergistic effect on the evaluated traits were positive.
Shahram Taheri; Ahmad Gholami; Hamid Abbasdokht; Hassan Makarian
Abstract
In order to evaluate the effects of seed priming to reduce water deficit stress in safflower cultivars, an experiment was conducted as a split plot factorial based on randomized complete block design with three replications at Shahrood Agricultural Research Center in 2015. The main plot consisted of ...
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In order to evaluate the effects of seed priming to reduce water deficit stress in safflower cultivars, an experiment was conducted as a split plot factorial based on randomized complete block design with three replications at Shahrood Agricultural Research Center in 2015. The main plot consisted of irrigation at three levels based on the evaporation from class A evaporation pan: non water deficit stress (60 mm evaporation), mild water deficit stress (120 mm evaporation) and severe water deficit stress (180 mm evaporation) and subplots consisted of two factors include safflower cultivars (Goldasht, Sina and Soffeh) and seed priming (Primed seeds with salicylic acid and non-primed). The results showed that severe water stress reduced the grain yield by about 29 percent compared to non stress conditions. In these conditions activity of superoxide dismutase, peroxidase, ascorbate peroxidase and catalase enzymes was increased by about 33, 25, 29 and 40 percent respectively. In severe water deficit conditions, content of malondialdehyde, proline and carotenoid significantly increased but the amount of chlorophyll was reduced. Priming of seeds with salicylic acid caused the antioxidant defense system activity to be increased by about 7-9 percent, therefore increased resistance of safflower plants to water stress and resulted in greater seed yield under water stress conditions. Interaction of irrigation and cultivar appeared to be significant on seed yield and activity of catalase, peroxidase and ascorbate peroxidase enzymes.
Hojjat Salehzadeh; Manouchehr Gholi pour; Hamid Abbasdokht; Mehdi Baradaran
Abstract
Nitrogen (N) affects adversely the tobacco yield quantity and quality as it increases yield, Chlorine and nicotine contents, but decrease potassium content. This experiment was aimed at optimization of (the balance between) N concentration in leaf, stem and root to increase both yield quantity and quality ...
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Nitrogen (N) affects adversely the tobacco yield quantity and quality as it increases yield, Chlorine and nicotine contents, but decrease potassium content. This experiment was aimed at optimization of (the balance between) N concentration in leaf, stem and root to increase both yield quantity and quality (high potassium, low Chlorine and medium nicotine contents) using artificial neural network. Two field experiments based on complete block design with three replications were conducted in Tirtash and Urmia tobacco research centers. Treatments were factorial arrangement of two N sources (urea and nitrate ammonium) and four application patterns (basal, 2/3 basal and 1/3 after initiation of rapid growth (AIRG), 1/2 basal and 1/2 at AIRG, 1/3 basal and 2/3 at AIRG). The N concentration of leaf, stem and root (model inputs) was measured in 30, 50, 70, 85 and 100 days after transplanting. After harvesting, the quantity of cured leaf and its Cl, K and nicotine content (model outputs) were also determined. The results indicated that a model with one hidden layer and configuration of 15-15-4 is appropriate and there were no significant different between two N sources. The best pattern was use of nitrate ammonium in 2/3 basal and urea 1/3 basal. The average value of optimized N concentration was 3.06, 2.42 and 1.5 percent for leaf, stem and root, respectively. These optimized concentrations can lead to potential increase in quality and quantity of tobacco which should be taken into consideration by breeders and agronomists.