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Showing 4 results for Rahemi
Investigating the effect of physical education teachers' experience and the use of collaborative learning techniques in increasing students' skills and active role in the classroom

Volume 1, Issue 2 (Summer 2020)
Abstract
Emphasis on providing students with authentic and comprehensive educational experiences has been recommended in many educational systems as a necessity for motor, social and psychological growth. Despite the focus of recent studies on preparing physical education teachers to enter the profession, little attention has been paid to beginning teachers and how these teachers can promote rich physical education experiences. Therefore, this study seeks to understand how a beginning physical education teacher can implement the collaborative learning model and share responsibility for teaching-learning processes with students. The participants included 77 physical education teachers with little experience and novices of the first secondary school in Razavi Khorasan (Qochan, Taibad, Mashhad), whose opinions were obtained using a researcher-made questionnaire. One-sample t-test and regression were used to analyze the findings. The results showed that the indicators of cooperative learning, being active in the class, teachers' experience, recognized talent, interaction with other students and following the manager's and teacher's decisions have a significant effect on students' skills.
 
Agroecological zoning of agricultural lands in Golestan province for Faba bean (Vicia faba L.) cultivation by ordered weighted average (OWA)

Volume 24, Issue 1 (Spring 2020)
Abstract
Introduction:
Faba bean is one of the main winter crops in Golestan province (northeast Iran), with an estimated production of about 106,284 tons of green pods and 7256 tons of dry grain while the harvesting land area  is about 1838 ha. Topographic characteristics, climatic conditions and the soil quality of an area are the most important parameters to evaluate land suitability. To develop successful cropping systems, it is necessary to understand how a crop such as faba bean responds to biological, chemical, physical, and climatic variables, and how this response can be influenced by management. Accordingly, farmers can improve their production in this district, and at the end of the study, the distribution and areas of land suitable for faba bean cultivation in Aq Qala were determined. In addition, this research provides information at a local level that could be used by farmers to select cropping patterns in accordance with suitability results.
Materials and methods:
The study areas of the research include agricultural lands and rangelands of Golestan province  Using 1: 50,000 maps of the national cartographic center of Iran, we created a 20 m digital elevation model (DEM) with a topo-to-raster function. In this study, the first agro-ecological requirements of faba bean were determined according to scientific resources. Several parameters were considered in this study, including the annual average, minimum and maximum temperatures, annual precipitation, slope, elevation, and some soil properties such as organic matter, pH, EC, texture, phosphorus, potassium and calcium. The last 12-year climatic data were gathered from 4 meteorological stations and 21 rain gauge stations in the Golestan province. The mean temperatures were calculated from daily mean minimum and maximum temperature data. The rainfall and temperature data of the whole province were used to interpolate and draw map of annual rainfall, and annual average, maximum and minimum temperature by geostatistical and interpolation methods. The slope and elevation information was obtained from the Digital Elevation Model (DEM) using GIS software. The standardization of data was used from fuzzy method and Analytic Hierarchy Process (AHP) was used for weighting the criteria. Finally, using ordered weighted average (OWA) in the  IDRISI software, faba bean cultivation potential map was prepared.
Results and Discussion
The results indicated that the most important variables, according to their specific weighting, were annual precipitation during the growing season (0.2876), slope (0.5396) and EC (0.3913). The digital environmental layers overlaid and integration in GIS media, then zoning of lands were carried out in 4 classes (highly suitable, suitable, less suitable and non-suitable). The study area includes different classes with diverse capacities for faba been cultivation comprising: a highly suitable potential, which constitutes 55.78% of the total area; a suitable class, 27.82%; a less suitable, 12.23%; and non-suitable, 4.17%. The final maps showed that more than 80% of agricultural lands of township are suitable for faba bean production. This research provides information at a local level that could be used by farmers and decision makers to select cropping patterns in accordance with their suitability. The topography, soil characteristics and climatic conditions were the most important determinant parameters of this evaluation. Our results revealed that 86.60% of the land area is suitable for faba bean cultivation. From the land suitability analysis, it was concluded that, in general, some nutrient contents of the soil are low or high for the study region. In addition, the research results indicated that the main limiting factors are high EC and low rainfall.
Conclusion
In conclusion, a combination of GIS, AHP and OWA is a practical and applicable method for determining land suitability for faba bean crops. In this study, the time-saving during the development of the land suitability map for faba bean was considerable. This method is almost a new application in Iran for land suitability analysis. However, decision makers should consider the side effects of applying these methods in the determination of suitable areas for crop growing. The result in of this study indicated that the OWA is a valuable approach in land suitability assessment, therefore, we suggest that the OWA should be used with AHP in future land suitability evaluation. We recommend that similar studies should use other parameters such as relative humidity, wind speed, solar radiation and heavy soil metals.

Effects of growth regulators ethephon and 2,4-D isopropyl ester on fruit ripening and quality of fig (Ficus carica L. cv. Sabz) under rain-fed conditions
S. Sedaghat, B. Gaaliche, M. Rahemi,
Volume 25, Issue 4 (5-2023)
Abstract
Fig (Ficus carica L. cv. Sabz) fruit growth and development under rain-fed conditions differs from fig grown under irrigated conditions and responds differently to the growth regulators application. This study aimed to reveal how ethephon (0, 50, 100, 150, 200 mg L-1) and 2,4-D isopropyl ester (0, 5, 10, 15, 20 mg L-1) can accelerate fruit ripening in fig cv. ‘Sabz’. Fruits were sprayed three times by foliar application at 15-days intervals for two consecutive years. The highest fruit ripening percentage occurred with the second time that ethephon (200 mg L-1) was sprayed. Application of 100 mg L-1 ethephon increased the total soluble solids with the second and third foliar spraying. Ostiole cracking in dry fig fruits became most prevalent when applying 50 mg L-1 ethephon by the third foliar spraying. The highest carotenoid content was caused by 100 mg L-1 ethephon by the second foliar application. Furthermore, the highest sugar content occurred in response to the second foliar spraying of 50 mg L-1 ethephon. The second 2,4-D isopropyl ester (10 mg L-1) foliar spraying significantly increased fruit diameter. Since the crop has asynchronous nature of ripening, harvesting continued for several weeks. Ethephon (200 mg L-1) accelerated fig harvesting and made it occur about 7 days sooner under rain-fed conditions. Therefore, accelerating fig fruits ripening can reduce the likelihood that fruits will be exposed to drought near the end of the season. Also, ethephon treatment can help prevent loss of fruit quality.
 
Role of Seed and Gibberellic Acid on Return Bloom in Olive (Olea europaea L. c.v. ʻTokhme Kabkiʼ)
M. Zare, M. Rahemi, S. Eshghi,
Volume 25, Issue 5 (9-2023)
Abstract
Alternate bearing is one of the most important problems in olive production around the world. This experiment was performed on 25-year-old olive trees of Tokhme Kabki cultivar in an olive orchard located in Shiraz, in 2018-2019. In this experiment, the role of normal fruits, shot berries, fruit removal, and Gibberellic Acid (GA3) application on the amount and type of return flower were determined. We demonstrated that seed has a significant role in flower induction in olive. Shot berry fruits actually induced return bloom and removing the fruit before pit hardening stimulates induction of flower bud in ʻTokhme Kabkiʼ olive cultivar. GA3 application before pit hardening significantly inhibited flower formation. Endogenous GA3-like substances was also determined in fruit flesh and seed tissues support the idea that, high concentration of GA3-like during pit hardening is responsible for the inhibition of flowering. According to the rapid increase in GA3-like substances in the fruit tissues, it appears that this compound may be transferred to the buds and then directed toward vegetative growth. Data suggest that GA3-like level in the fruit flesh and seed tissues is one of the main factors in alternate bearing of olive tree. Therefore, thinning the seeded fruit till 6 weeks after full bloom or before pit hardening would be effective in reducing the concentration of GA3 in the olive tree and reducing the severity of alternate bearing.
 
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