Ferdowsi University Of Mashhad Research Articles

Impact of some geological parameters on soil abrasiveness

A systematic estimation of the amount of tool wear is nearly impossible because there is no universally accepted test for determining soil abrasiveness. Laboratory devices that have been developed in recent years have fewer limitations than older methods, but they are unique and are under development. A new device has been developed and used at the Ferdowsi University of Mashhad, Iran, to evaluate how geological factors affect soil abrasion behavior. Samples with known geological characteristics including hardness (mineralogy), grain size, and grain roundness were prepared and tested using the new abrasion test unit. The results indicate a direct linear relationship between the relative mineral hardness (Mohs scale) and abrasion. Moreover, the results of the abrasion testing showed increasing abrasion with grain size and angularity. Furthermore, the impact of moisture content was also examined, and the amount of measured wear followed an approximately bell shaped curve relative to the water content, as has been reported in similar studies by other research groups. Additional testing of the samples for shear strength showed a good correlation between the shear strengths of the specimens and the abrasivity.

Effects of salinity stress on some yield parameters and morphological characteristics of spearmint (Mentha spicata L.) in hydroponic conditions

Mint is an important medicinal herb that is cultivated in different parts of the world. In order to investigate the effects of salinity stress on morphological characteristics of spearmint (Mentha spicata L.), an experiment was conducted in 2013, based on complete randomized design, under hydroponic conditions, at Research Greenhouse of Faculty of Agriculture, Ferdowsi University of Mashhad, Iran. Treatments were five salinity levels (0, 30, 60, 90 and 120 mM of sodium chloride) with four replications. Growth medium was 2:1 cocopeat to perlite, and complete nutrients solution was used. Supplying plants’ nutrients was twice a week along the irrigation water application. When plants’ height was 30 cm, salinity treatments were applied and were continued till full flowering. At the end of the experiment, morphologic traits including plant height, number of main stems, number of lateral branches, leaf area, specific leaf weight, stem diameter, number of nodes, fourth internode length, and spike length were measured. Results showed that salinity stress had significant effects on leaf area, fresh and dry weights of leaf, stem and root, plant height, number of lateral branches, number of nodes, fourth internode length, and spike length. The highest leaf area, leaf dry weight, plant height and number of lateral branches were observed in control treatment. The lowest leaf area and leaf dry weight were obtained in salinity level of 120 mM, and the lowest plant height and number of lateral branches were observed in salinity levels of 90 mM and 120 mM. Salinity had no significant effect on fresh weight of shoot to root ratio, fresh weight of leaf to root ratio, specific weight of leaves, number of main stems and stem diameter. According to the results, it appears that spearmint is sensitive to salinity stress and it can't tolerate salinity levels higher than 30 mM sodium chloride.

Influence of phosphorus and soil amendments on black seed (Nigella sativa L.) oil yield and nutrient uptake

In order to investigate the effects of sulfur (S) oxidation and vermicompost (V) application on black seed (Nigella sativa L.) oil yield and its nitrogen and phosphorus uptake, a two-year field experiment was conducted at Faculty of Agriculture, Ferdowsi University of Mashhad, Iran in a calcareous soil during 2013 and 2014. A randomized complete block design arranged in factorial with four replications was used to analyze 12 treatments. The calcareous soil amendments (control, V+Thiobacillus thiooxidans (T), S+T and V+S+T) and three levels of P (0, 30 and 60kgha−1) were considered as the first and the second experimental factors, respectively. All calcareous soil amendments (V+T, S+T and V+S+T) caused a significant reduction in soil pH, and a significant increase in electrical conductivity (EC). In addition, calcareous soil amendments showed a considerable effect on soil available P content. The highest grain, oil and essential oil yields were obtained from V+S+T treatment. The soil amendments significantly increased N and P concentration in plants and improved P harvest index. Although a positive correlation was observed between P and N concentration, there was a negative correlation between grain yield and P use efficiency. It seems that any approach that would allocate more P to seeds, during seed development on the mother plants, would increase final yield in black seed.

Weeds ability to phytoremediate cadmium-contaminated soil

ABSTRACTAn alternative method to other technologies to clean up the soil, air and water pollution by heavy metals is phytoremediation. Therefore, a pot culture experiment was conducted at the College of Agriculture, Ferdowsi University of Mashhad, Mashhad, Iran, in 2014 to determine the potential absorption of cadmium by Portulaca oleracea (Common purslane), Solanum nigrum (Black nightshade), Abutilon theophrasti (Velvetleaf) and Taraxacum officinale (Dandelion). The type of experiment was completely randomized design with factorial arrangement and four replications. The soil in pot was treated with different rates of CdCl2.H2O (0 (control), 10, 20, 40, 60, and 80 mg Cd/kg soil) and the plants were sown. With increasing concentration levels, fresh weight and dry weight of shoots and roots of all plant species were reduced. The reduction severity was ranked according the following order, P. oleracea > A. theophrasti > S. nigrum > T. officinale. Bioconcentration factor (BCF), Translocation factor (TF) and Translocation efficiency (TE%) was ranked according the following order, T. officinale > S. nigrum > A. theophrasti > P. oleracea. The results of this study revealed that T. officinale and S. nigrum are effective species to phytoremediate Cd-contaminated soil.

Effects of phosphorus and seed priming on seed vigor, fatty acids composition and heterotrophic seedling growth of black seed (Nigella sativa L.) grown in a calcareous soil

In order to investigate the effects of increasing soluble phosphorus (P) on seed vigor, fatty acids composition and heterotrophic seedling growth of black seed (Nigella sativa L.) in a calcareous soil, a two-year field experiment was conducted at Faculty of Agriculture, Ferdowsi University of Mashhad, Iran, in 2013 and 2014. The fertilizer resources (vermicimpost (V)+Tiobacilus thiooxidans (T), Sulfur (S)+T, V+S+T and control) and three levels of P (0, 30 and 60kgha−1) were the first and second experimental factors, respectively. In the second experiment, selection treatments (which showed emergence below 60% in the previous experiment) and seed priming (no-priming, water-priming and three levels of P-priming of 100, 300 and 500mM KH2Po4) were the first and second experimental treatments, respectively. The resources of soil amendment (V+T, S+T and V+S+T) significantly decreased the P concentration in seed coat and mean germination time. However, 1000 seed weight, seed vigor, P concentration in embryo and intact seed were significantly increased. The soluble P had significant decreasing effects on linolenic acid. There was the highest significant relationship between linolenic acid and seed vigor (R2=0.74**). In addition, seed reserve depletion percentage, seed reserve utilization efficiency and emergence percentage significantly increased by P-priming treatments. There was a positive correlation between weight of mobilized seed P and emergence percentage of black seeds (R2=0.90**).

Germination of Spotted Spurge (Chamaesyce maculata) Seeds in Response to Different Environmental Factors

Spotted spurge, a C4species, is a summer annual weed, introduced to the Golestan province of Iran in 2006. A series of laboratory experiments were conducted at the Faculty of Agriculture, Ferdowsi University of Mashhad, Iran, to evaluate the influence of environmental factors on seed germination of spotted spurge. Seeds germinated over a constant temperature range of 25 to 45 C with a 14-h photoperiod and at 30 to 50 C in continuous darkness. Seeds germinated at alternating day/night temperature regimes of 25/15 to 45/35 C, with maximum germination (> 80%) at alternating day/night temperatures of 35/25, 40/30, and 45/35C. Germination increased from 23.5 to 98% as water potential increased from −0.6 to 0 MPa (control). Germination was > 85% at sodium chloride (NaCl) concentrations up to 80 mM, with no germination at 160 mM NaCl. Germination was not affected by pH, and it was > more than 95% at pH ranging from 4 to 9. The germination of seeds submerged in water for a period less than 3 wk was > 60%, whereas no germination was observed after 9 wk of submergence in water. The results of our study could help to develop effective management strategies for this species. The results also suggest that spotted spurge could invade most tropical regions of Iran.

Study of boundaries equilibrium in a shallow solar pond

Abstract. One-dimensional mass and heat transfer models have been provided to find salinity and temperature gradients in a gradient layer of a solar pond. Using finite difference method (FDM), heat and mass transfer differential equations were discretized by Crank - Nicolson scheme. The present study is based on the experimental data of a solar pond in Ferdowsi University of Mashhad, obtained in a period of 126 days from May to September 1999. Increase in concentration and temperature gradient, cause increase and decrease in stability, respectively. Time variations of concentration and temperature gradients are affect the dynamic stability and equilibrium of upper and lower boundaries of the solar pond. The equilibrium of the upper and lower boundaries has been compared using Neilson equilibrium boundary criterion. The numerical data of the lower boundary were far from dynamic instability. Those data had good agreement with the Neilson equilibrium boundary criterion. The dynamic stability of the upper boundary was maintained with time, but the numerical data of the upper boundary were not in keeping with the Neilson equilibrium boundary criterion. Therefore the lower boundary has with time, behaved with more equilibrium towards the upper boundary.

Investigating the Influence of Social Cognitive, Affective and Evaluative Identities on Participation Intention in Online Communities and Shopping (Case Study: Students of Faculty of Economic and Administrative Science, Ferdowsi University of Mashhad)

Previous studies show that there are many researches about online communities. Increasing in participating in online tasks, which lead to E-shopping, that lead to better marketing strategy and more profit is the cause of this research. Thus, the aim of this research is to investigate the influence of social, cognitive, emotional and evaluative identity on participation intention in online communities and shopping. We have 6 hypotheses through reviewing the literature from 1995 until 2013. The results show that social, cognitive, emotional and evaluative identity has significant impact on online space. DOI: 10.5901/mjss.2015.v6n3s2p732

Relationship between nitrogen and phosphorus use efficiency in saffron (Crocus sativus L.) as affected by mother corm size and fertilization

Field experiments were conducted to determine the effects of mother corms size and type of fertilizer on acquisition and use efficiency of nitrogen (N) and phosphorus (P) in Saffron, at Faculty of Agriculture, Ferdowsi University of Mashhad, Iran. The experiment designed as factorial-split with three replicates, 12 main plots [mother corm size (4g and lower, 4.1–8g, 8.1–12 gand over 12g)×fertilization (composted cattle manure 25tha−1, chemical fertilizer (N 300kgha−1 + P 100kgha−1 and control)] and two sub-plots (first and second year). In both years, the larger mother corms (8.1–12g and more) resulted in a greater nitrogen content (gm−2) in daughter corms and the whole plant. In addition, acquisition and use efficiency of (N) and (P) were increased with increasing mother corms size. In both years, (N) and (P) use efficiency in composted cattle manure treatment was significantly higher than that of chemical fertilizer (by 21 and 61%, respectively). There was a positive and significant correlation between (N) use efficiency and (P) use efficiency (R2=0.98**) and between (N) harvest index and (P) harvest index (R2=0.99**).

Evaluation of mother corm weights and foliar fertilizer levels on saffron (Crocus sativus L.) growth and yield components

This study evaluated the influence of three corm weight grades, <5g, 5–10g and >10g, and five levels (0, 5, 10, 15 and 20%) of Dalfard 15® foliar spraying (specific fertilizer for saffron farms in Iran containing 12% N as NO3−, 8% P, 4% K, 2000mgL−1 iron chelate, 1000mgL−1 Zn, 1000mgL−1 Mg and 500mgL−1 Cu) on growth and yield criteria of saffron (Crocus sativus L.). For this purpose, an experiment as a factorial layout based on randomized complete block design with four replications was conducted in Research Greenhouse Area of College of Agriculture, Ferdowsi University of Mashhad, Iran during 2008–2010. The result showed that the mother corm weight grades, different levels of foliar fertilizer and their interactions had significant effects on saffron yield components. The highest amount of fresh weight of flower (35.44gm−2) and dry weight of stigma (0.36gm−2) were obtained by mother corms 5–10g and 15% concentration of foliar fertilizer. Daughter corm number increased significantly (241%) by using 15% concentration of foliar fertilizer and mother corm 5–10g compared with using mother corm <5g with no fertilizer spraying. The fresh weight of flowers from mother corms <5g under 20% concentration of foliar fertilizer was statistically the same as the fresh weight of flowers from mother corms 5–10g and >10g with 10% concentration of foliar fertilizer. Totaling, 15% concentration of foliar fertilizer and 5–10g mother corms were the most favorable condition for the entire vegetative and reproductive traits of saffron in this study.

Exergy variations of the gradient layer in a shallow solar pond

Abstract. A salinity gradient solar pond can act as a solar thermal energy storage source for all seasons of the year and in all weather conditions. Solar pond layers exergy can be considered as the potential for getting the maximum amount of work done. Exergy in a gradient layer was studied based on the experimental data of the years 1997 and 1998 for 229 days in a solar pond in Ferdowsi university of Mashhad. The research revealed that variations of specific exergy (exergy per unit mass) for gradient layer, is affected by temperature variations of lower and upper convective layers. The specific exergy reached its maximum in mid-August, but the exergy per pond unit area in the early period of that month reached the maximum amount, because in addition to the temperature variations of the lower and upper convective layers, the time variations of the gradient layer thickness also affect exergy variations per unit area.

Effect of Simulated Radiation on Sethoxydim Performance Used with and without Vegetable Oils

The photodecomposition of post emergence herbicides on leaf surface can be affected via adding vegetable oils to spray tank. Nine vegetable oils were compared to assess the photodecomposition of sethoxydim on wild oat leaf surface under simulated light conditions. The experiment was conducted as completely randomized factorial design with three replications at the College of Agriculture, Ferdowsi University of Mashhad, Iran, in 2013. Each herbicidal solution (with and without vegetable oil) was exposed to simulated light at 0, 5, 10, 20, 30, 60, 120 and 240 MAS (min after spray), for 30 min. The performance of sethoxydim in the presence of turnip, olive, soybean, corn, sunflower, canola, sesame, castor and cotton seed oils, compared to non-vegetable oil solution, increased up to 4.02-, 3.44-, 3.22-, 3.08-, 2.86-, 2.09-, 1.96-, 1.77- and 1.25- fold. All vegetable oils significantly improved the resistance of sethoxydim to light treatment. The effect of vegetable oils on the resistance to photodecomposition of sethoxydim was significant different at less than 60 MAS, while no significant differences were noted among vegetable oils when light treatment occurred at 120 and 240 MAS. Data from the light treatments have confirmed that when vegetable oils were added to sethoxydim, light adverse effect was lower, which is presumably due to disturbance of the cuticule and the rapid absorption of sethoxydim by wild oat leaves. Vegetable oils fatty acids composition effect the resistance to photodecomposition of sethoxydim, as with increasing the unsaturated fatty acid values, the resistance to photodecomposition was improved.

Effect of Simulated Radiation on Sethoxydim Performance Used with and without Vegetable Oils

The photodecomposition of post emergence herbicides on leaf surface can be affected via adding vegetable oils to spray tank. Nine vegetable oils were compared to assess the photodecomposition of sethoxydim on wild oat leaf surface under simulated light conditions. The experiment was conducted as completely randomized factorial design with three replications at the College of Agriculture, Ferdowsi University of Mashhad, Iran, in 2013. Each herbicidal solution (with and without vegetable oil) was exposed to simulated light at 0, 5, 10, 20, 30, 60, 120 and 240 MAS (min after spray), for 30 min. The performance of sethoxydim in the presence of turnip, olive, soybean, corn, sunflower, canola, sesame, castor and cotton seed oils, compared to non-vegetable oil solution, increased up to 4.02-, 3.44-, 3.22-, 3.08-, 2.86-, 2.09-, 1.96-, 1.77- and 1.25- fold. All vegetable oils significantly improved the resistance of sethoxydim to light treatment. The effect of vegetable oils on the resistance to photodecomposition of sethoxydim was significant different at less than 60 MAS, while no significant differences were noted among vegetable oils when light treatment occurred at 120 and 240 MAS. Data from the light treatments have confirmed that when vegetable oils were added to sethoxydim, light adverse effect was lower, which is presumably due to disturbance of the cuticule and the rapid absorption of sethoxydim by wild oat leaves. Vegetable oils fatty acids composition effect the resistance to photodecomposition of sethoxydim, as with increasing the unsaturated fatty acid values, the resistance to photodecomposition was improved.

Irrigation levels and dense planting affect flower yield and phosphorus concentration of saffron corms under semi-arid region of Mashhad, Northeast Iran

In arid and semi-arid regions of Iran, drought and water management are considered as important challenges in developing sustainable agriculture. The effects of irrigation levels and dense corm planting on flower yield, daughter corms behavior and phosphorus uptake of saffron (Crocus sativus L.) were studied as two-year field experiment based on a randomized complete blocks design arranged in split-plot with three replications at Faculty of Agriculture, Ferdowsi University of Mashhad, Iran, during 2012–2013 and 2013–2014 growing seasons. The irrigation levels including 50, 75 and 100% of saffron water requirement (SWR) and dense corm planting (50, 100, 200 and 300cormm−2) were allocated to the main and sub-plots, respectively. The lowest yield, minimum number of daughter corms and phosphorus content of saffron were observed by planting 50cormsm−2 and supplying 50% of SWR. In the first year, flower characteristics were not affected by irrigating at 50% of SWR. However, in the second year, flower number, fresh flower and dry stigma yields significantly decreased by irrigating at 50% of SWR compared with 75 or 100% of SWR. In the second year, phosphorous concentration (gkg−1) and content (gm2) in small (0.1–4g), medium (4.1–8g) and large (over 8g) daughter corms were significantly more than the first year. In general, small daughter corms contained less phosphorous compared with large (over 8g) corms.

Neural network unfolding of neutron spectrum measured by gold foil-based Bonner sphere

Bonner sphere spectrometer (BSS) based on gold foils, as thermal neutron detectors, is one of the common device for neutron spectrometry. In this paper, the response functions of the Bonner spheres were determined for neutrons with energies ranging from thermal up to 20 MeV using Monte Carlo code. To verify the simulated response functions, the spheres of BSS were irradiated with 241Am-Be neutron source at the Ferdowsi University of Mashhad and the activities of the gold foils were measured. Then the artificial neural network was applied for neutron spectrum unfolding. The results showed a good agreement between unfolded and reference spectrum of ISO 8529-1.

Influence of planting date, intercropping and plant growth promoting rhizobacteria on cumin (Cuminum cyminum L.) with particular respect to disease infestation in Iran

This study was performed to evaluate the effect of different planting dates, planting pattern and plant growth promoting rhizobacteria (PGPR) on yield, growth and also disease development in cumin (Cuminum cyminum L.) when intercropped with fenugreek (Trigonella foenum-graecum L.). For this purpose, a field experiment was conducted in a split-plot factorial arrangement based on randomized complete block design with three replications in Ferdowsi University of Mashhad, Iran in 2012 and repeated in 2013. The experimental treatments were planting dates (5 November, 5 December and 5 March) assigned to main plots, planting patterns (sole cropping and intercropping of cumin and fenugreek) and PGPR (control, Pseudomonas putida and Azotobacter chroococcum) that were randomized in subplot. Results showed that fall planting dates and intercropping system had positive effects on cumin disease control, whereas application of PGPR had no significant effect in both years. Fall planting dates produced more seed yield in both crops than spring planting. The benefit of Pseudomonas was demonstrated on seed yield of cumin and fenugreek. The values of land equivalent ratio (LER) for all treatments of planting dates and PGPR were more than one. This issue indicated that the intercropping system had positive effect on diseases control because of the physical barrier established by the fenugreek and subsequently on seed yield for 2012 and 2013 growing seasons. In essence, modifying planting date and using intercropping systems contribute to the reduction of disease infestation of cumin without using chemicals.

Phenological response of milk thistle (Silybum marianum [L.] Gaertn.) to different nutrition systems

Nowadays, growing medicinal plants in sustainable agricultural systems in which sustainable plant nutrition strategies play an important role are more focused. Seeds of milk thistle plants (Silybum marianum [L.] Gaertn.) are the main source of silymarin which is known as the biological active component helpful in treating liver and biliary diseases and also preventing liver cancer. Phenological stages, especially the reproduction time and maturity of milk thistle, might be affected by management strategies. In order to investigate the potential effects of different nourishment systems on phenological stages of milk thistle, a field experiment was conducted during 2010–2011, at Research Station, Faculty of Agriculture, Ferdowsi University of Mashhad, Iran. Twelve nutrition systems comprising single and integrated nutrition systems of vermicompost, poultry manure, chemical fertilizer, mycorrhiza (Glomus mosseae), and bio-sulfur (Thiobacillus sp.) were compared in a completely randomized block design with three replications. According to the results, growth development stages of milk thistle in Mashhad climate were found to have four discrete stages; vegetative, elongating, flowering, and seed maturation stage. Analysis of variance of heat units, expressed in growing degree-days (GDDs), showed that elongating and flowering stages were significantly affected by different nutrition systems (P<0.05). Milk thistle plants treated with mycorrhiza started the elongating stage and flowering stage with less GDDs (845 and 1001°C, respectively) compared with other treatments. The highest amount of GDDs for starting the elongating stage was recorded for chemical fertilizer treatment and plants under integrated use of mycorrhiza and vermicompost required more GDDs to start flowering stage.

ارزیابی تأثیر تراکم بوته و الگو های کشت بر خصوصیات کمی و کیفی گیاه دارویی بالنگو (Lallemantia royleana Benth.)

In order to evaluate the effects of plant density and planting pattern on quantitative and qualitative characteristics of Balangu (Lallemantia royleana Benth.) as a medicinal plant, an experiment was conducted at Research station of Faculty of Agriculture, Ferdowsi University of Mashhad, Iran, during growing season of 2011-2012. A factorial layout based on a randomized complete block design with nine treatments and three replications was used. The treatments comprised three levels of planting density (60, 70 and 80 plants.m-2) and three levels of planting pattern (row planting, mixed row planting and flat planting). Studied criteria of Balangu were quantitative characteristics (such as number of lateral stems, plant height, 1000-seed weight, biological and seed yield and harvest index) and qualitative characteristics (including mucilage content and yield; and swelling factor). Results showed that all quantitative characteristics of Balangu except 1000-seed weight were significantly increased by plant density. Qualitative characteristics were not significantly affected by plant density except mucilage yield but the maximum quantitative and qualitative characteristics were obtained by row planting. Interactions between plant density and planting pattern showed that the maximum of seed and mucilage yield were obtained by row planting and plant density of 80 plants.m-2. Non significantly affected by planting pattern and plant density showed that Balangu can tolerates the environmental effects and this is the important property for plants selection and development.

Water capture efficiency, use efficiency and productivity in sole cropping and intercropping of rapeseed, bean and corn

In order to evaluate water capture, use efficiency and productivity in sole and intercropping systems of rapeseed (Brassica napus L.), bean (Phaseolus vulgaris L.) and corn (Zea mays L.), an experiment was conducted in two growing seasons of 2007-2008 and 2008-2009 in research field of faculty of agriculture, Ferdowsi University of Mashhad, Iran. The experiment was conducted as a randomized complete block design with three replications and six treatments. Treatments included monoculture of rapeseed (sown 23 September), bean and corn (sown in 30 April) as sole cropping and also simultaneous double cropping of bean and corn (sown in 30 April), two stage relay intercropping of rapeseed (sown in 23 September) and corn (sown in 30 April) and finally three stage relay intercropping of rapeseed (sown in 23 September), bean (sown in 9 April) and corn (sown in 30 April). Intercropping combinations showed positive and significant (P≤0.01) effect on water capture efficiency compared with sole cropping treatments. Double cropping had the maximum value of this index as 0.56 mm/mm. There was superiority for double cropping in water use efficiency and productivity for species in treatments, also among treatments significantly (P≤0.01) because of its higher seed yield. The values of land equivalent ratio for intercropping combinations were more than one (LER>1). This confirmed that they used land more efficient compared to sole cropping treatments from viewpoint of resources use and yield production. Rapeseed sole cropping and double cropping showed the highest values of economic productivity of irrigation water (EP) as 3.95 and 2.53 Tooman per ha production income/Tooman per ha water expense, respectively. Totally, it seems that double cropping in most cases was superior to other treatments. Keywords: economic productivity of irrigation water (EP), fall sowing, land equivalent ratio (LER), seed yield.

Study of Personality Type and Relationship With Job Selection Between

Background: Today, continuous emergence of new jobs and elimination of old jobs have made a lot of problems for some individuals and in the meantime, developing countries transferring from traditional economy to world economy are more influenced by these changes. Objectives: Considering the importance of personality types and the role of culture in job selection, the current study was conducted aimed to examine personality types in students of Iran and America. Patients and Methods: The study method was correlation. The statistical population consisted of all students at Ferdowsi University of Mashhad, Iran and all the students at El-Camino College, America in the academic year 2012-2013. The participants were selected using convenience sampling method. Using Cochran’s sample size formula, 320 students (170 Iranian students and 150 American students) were selected from two universities and questionnaires were distributed among them. Data collection tools included Holland’s vocational personality questionnaire in six personality types of social, artistic, conventional, realistic, enterprising, and investigative that its validity and reliability have been confirmed in different countries. The obtained data were analyzed using descriptive statistical indices, Z-test and Chi-squared test. Results: The findings of the study showed that: 1) There was a significant relationship between Iranian students' personality type and their job 2) There was compatibility between American students' personality type and their job 3) There was not a significant difference between correlation rate of personality type and job in two groups of Iranian and American students. Conclusions: Considering the obtained results, job selection by students in both Iranian and American groups was not independent from their personality type.