University Of Birjand Research Articles

Physiological and growth responses of milk thistle (Silybum marianum (L.) Gaertn.) to soil-applied herbicides

Milk thistle (Silybum marianum (L.) Gaertn.) is cultivated globally as a valuable medicinal plant. The presence of weeds poses numerous challenges to milk thistle production, making weed management the primary concern in milk thistle fields. Chemical weed management is an economical and promising approach to controlling weeds in cropping systems. Therefore, to investigate the tolerance of milk thistle to soil-applied herbicides, in the spring of 2022, we conducted a pot experiment as a completely randomized factorial design with four replications at the research greenhouse of the University of Birjand, Iran. The applied herbicides included metribuzin, pendimethalin, trifluralin, and ethalfluralin at six doses (0, 50, 75, 100, 125, and 150% of the recommended dose (ai ha−1)). Herbicide treatments had adverse effects on the root and shoot growth of milk thistle. Compared to the control, ethalfluralin at 150% (−60.1%) and metribuzin at 50% (−13.3%) had the highest and lowest herbicide negative effects on root dry weight, respectively. In contrast to the control, we found that ethalfluralin at 150% (−64.4%) and metribuzin at 50% (−9.3%) of the recommended dose had the highest and lowest impacts on shoot dry weight, respectively. Furthermore, herbicide applications decreased the membrane stability index (MSI) and relative water content (RWC). Root and leaf levels of malondialdehyde (MDA), total phenol, DPPH scavenging, soluble carbohydrates, and proline increased after all herbicide treatments, compared to the control. Metribuzin and pendimethalin had fewer negative effects on milk thistle growth. Consequently, these herbicides could be considered as potential options for weed control in milk thistle fields.

Bioactive compounds and apoptotic effects of saffron (Crocus sativus L.) in different fertilizer conditions

In this study, the qualitative traits of stigma (crocin, picrocrocin and safranal content) and the apoptotic effects of stamen and petal extracts (real-time PCR analysis for evaluating the expression of Bax, Bcl2, CAS3 and CAS6 genes) of saffron were investigated under organic and conventional conditions at the Agricultural Research Field of the University of Birjand, Iran over three years. The treatments included field age (one, two, and three-year-old farm) and also organic and conventional cultivations with different levels (low, moderate, and high levels) of cow manure and chemical fertilizers, respectively. The results indicated that the crocin, picrocrocin and safranal contents were considerably increased using organic and chemical fertilizers compared to the control. The highest crocin, picrocrocin and safranal contents were obtained under applying a high level of manure in organic farming system (OFS-H), that safranal content in this level have no significant difference with applying a moderate level of manure in organic farming system (OFS-M), and applying a high level of chemical fertilizers in conventional farming system (CFS-H). Among the field ages, the three-year-old farm resulted in the highest qualitative yield of saffron compared to the one-year-old farm and the two-year-old farm. The real-time PCR analysis also showed that petal and stamen extracts led to up-regulation of Bax, CAS3 and CAS6 (Pro-apoptotic genes) and down-regulation of Bcl2 (Anti-apoptotic gene) in both cultivation ways. The highest and the lowest bioactive compounds and the expression of Pro-apoptotic genes belonged to stamen extract at organic farming system and petal extract at conventional farming system, respectively. The findings of this study could significantly contribute to identification of the best crop management strategy for increasing the qualitative and medicinal properties of Saffron.

The Role of Social Intelligence and Resilience in Explaining Students’ Distress Tolerance: A Study during Covid-19 Pandemic

IL RUOLO DELL’INTELLIGENZA SOCIALE E DELLA RESILIENZA NELLO SPIEGARE LA TOLLERANZA AL DISAGIO DEGLI STUDENTI: UNO STUDIO DURANTE LA PANDEMIA DI COVID-19 Abstract Understanding the factors that influence or correlate with distress tolerance is very important. Therefore, the aim of this study was to investigate the role of social intelligence and resilience in explaining college students’ distress tolerance. A descriptive correlational study was carried out on 260 male college students of Farhangian University of Birjand, Iran in 2020/21. They completed Social Intelligence Scale, Resilience Scale, and Distress Tolerance Questionnaire. The results showed that there was a direct and significant relationship between social intelligence and distress tolerance (r = 0.473; p <0.001), as well as resilience and distress tolerance (r = 0.608; p = 0.008). Also, the coefficient of determination showed that the components of social intelligence and resilience up to 65% can explain the variance of students’ distress tolerance. Psychological interventions such as promoting social intelligence and effective resilience can be used to prevent and control the college students’ distress especially during Covid-19 pandemic.

Genetic variation and cluster analysis of Narcissus tazetta L. genotypes using RAPD and ISSR markers

To evaluate the genetic diversity of Iranian Narcissus genotypes (e.g., Shomal, Shastpar, Shahla, Yasuj, Shiraz-1, Shiraz-2, Kuchak-e-Atri, Dutch, Khosf-1, Khosf-2, Birjand, and Tabas), different RAPD and ISSR primers were examined at the Plant Breeding Laboratory of the Faculty of Agriculture, University of Birjand, Iran. In sum, RAPD and ISSR primers produced 189 and 80 high-resolution bands. The average values of PIC, Ht, Hs, Nm, DST, FDT, NA, Ne, H, and I indices were 0.287, 0.369, 0.089, 0.486, 0.279, 0.760, 1.952, 1.459, 0.282, 0.437 for RAPD markers and equal to 0.297, 0.380, 0.099, 0.524, 0.278, 0.732, 1.978, 1.495, 0.303, 0.467 for ISSR markers, respectively. The analysis of molecular variance based on the RAPD and ISSR markers showed 23 and 13 % variations for intra-populations and 77 % and 87 % changes for inter-population variabilities, respectively. Cluster analysis based on the RAPD and ISSR markers grouped genotypes into four clusters. Based on RAPD and ISSR markers, the PCoA analysis also showed that the first three components justified equal to 96.9 % and 97.9 % of the total variance, respectively, indicating the dispersion of the primers used. In general, it was concluded that the genetic diversity of narcissus species could be employed for breeding programs.

The effect of biochars produced from barberry and jujube on erosion, nutrient, and properties of soil in laboratory conditions

The use of biochar can improve the various soil properties and reduce erosion. Also, biochar production has caused the optimal use of agricultural and industrial waste and can convert waste into useful compounds. A large mass of leaves and pruned barberry and jujube branches are abandoned annually without planning to use in South Khorasan. Therefore, in this experiment, the impact of biochars produced from barberry and jujube pruned materials (after six months) on the rate of soil erosion, nutrient, and soil properties were studied in the laboratory conditions at the University of Birjand, Iran, in 2021. Biochar treatments were examined at three 0%, 2%, and 5% levels by weight with four replications. Physicochemical and biological properties and soil nutrients were measured before and after adding biochars and applying erosion. The amount of soil loss was calculated by a standard portable rainfall simulator (a rainfall with an intensity of 160 mm/h for 15 min). The data was investigated using variance analysis and mean comparison (by LSD test and P ≤ 0.05), based on a completely randomized design by JMP13 software. The H/C ratio in the barberry and jujube biochars was about 0.33 and 0.53, respectively. Using the biochars at the 2% and 5% application levels significantly decreased soil erosion and improved soil properties. The 5% barberry biochar treatment caused the greatest reduction in bulk density and soil loss.Moreover, this treatment greatly increased the mean weight diameter of aggregates, saturation moisture, cation exchange capacity, organic matter, microbial biomass carbon, microbial respiration, and substrate-induced respiration of the soil compared to the other treatments. It was also more efficient in increasing and retaining soil nutrients. Using the produced biochars is recommended to improve the soil properties.

The Effectiveness of Gross Emotional Regulation Training Package on Procrastination of Female Students of University of Birjand

The Effectiveness of Gross Emotional Regulation Training Package on Procrastination of Female Students of University of Birjand

First comprehensive study of W-type W UMa eclipsing binary V1036 Her

CCD photometry of the eclipsing binary system V1036 Her was performed using Johnson V filter in Dr. Mojtahedi Observatory of the University of Birjand during July-August 2017 and July 2018. Moreover, the spectroscopy of the system was carried out by TRES during April 2018. A mass ratio of 3.07(27)is obtained and an initial effective temperature of 5500 was suggested. For the first time, the relative and absolute parameters of the system are determined by analyzing the light curve and radial velocity data. The results indicate that V1036 Her is a W-subtype W UMa system with a degree of overcontact of 22%. The analysis of the period change shows that the period of the system changes with the rate of P˙=2.23(4)×10−7day/year. With the assumption of the system mass conservation, a mass transfer rate from the primary to the secondary component of m˙1=1.00(3)×10−7M⊙/year is probable. Additionally, a periodic behavior with a period of about 10 years is observed in the O-C curve, which predicts the possibility of a third body with a minimum mass of 0.14(1)M⊙.

Growth and yield of saffron (Crocus sativus L.) affected by different levels of fulvic acid and cow manure in the second growing season

Purpose: The experiment was conducted to evaluate the optimal amounts of cow manure and fulvic acid and the interaction effects of inputs on the yield of saffron in the second growing season. Research methods: In this research, a factorial experiment based on Randomized Complete Block design (RCBD) with three replications was conducted in 2015-2016 and 2016-2017 growing seasons, in the University of Birjand, Iran. Experimental factors included cow manure in four levels (0, 10, 20, and 30 t.ha-1) and fulvic acid plus some micronutrients in three levels (0, 5, and 10 kg.ha-1). Findings: The results in the second year showed that the effect of cow manure was significant on flower number per m2 and total fresh flower yield and dry stigma yield so that the highest total fresh flower yield (32.081 g.m2) and dry stigma yield (0.325 g.m2) obtained in the treatment of 20 t.ha-1 cow manure and the lowest amount of these traits observed in the control (no-fertilization). The application of 10 kg.ha-1 fulvic acid led to the highest mean flower weight (0.512 g) and stigma yield (0.035 g.plant-1). The results of interaction effects showed that simultaneous application of cow manure and fulvic acid had a significant effect on fresh flower yield and the highest amount of these traits (33.613 g.m2) obtained in the combined application of 20 t.ha-1 cow manure and 10 kg.ha-1 fulvic acid. In general, it seems that separate and simultaneous application of optimal amounts of cow manure and fulvic acid, while improving the reproductive characteristics and yield of saffron, can guarantee the healthy and sustainable production of this valuable medicinal. Research limitations:There was no significant limitation to the research. Originality/Value: This research evaluates the simultaneous application of eco-friendly inputs of cow manure and fulvic acid on reproductive characteristics and yield of saffron which has been less studied.

Response of hemp (Cannabis sativa L.) to integrated application of chemical and manure fertilizers

The investigation of various nutrition systems in hemp plays an influential role in improving its production. An experiment was conducted in University of Birjand, Iran, during 2013-2014, in which manure (0, 10, 20, and 30 t.ha-1 of cow manure) was considered as the main plot and the combination of nitrogen (0, 50, and 100 kg N ha-1 as urea) with phosphorus (0 and 80 kg P ha-1 as triple superphosphate) fertilizers was considered as factorial in subplots. The type of soil fertility management had no significant effect on the percentage of female plants. Applying 20 t.ha-1 of manure plus 100 kg N ha-1 produced the highest biological yield, seed, and leaf extract. The highest oil content was obtained by applying a maximum of 50 kg N ha-1 without the use of phosphorus. The 30 t ha-1 manure plus 100 kg N ha-1 increased the leaf harvest index and decreased seed harvest index. Nitrogen consumption also increased the seed oil content and yield. Phosphorus increased the biomass and extracts of seed and leaves, also biological, seeds and oil yield. It seems hemp responds well to the combined application of nitrogen fertilizer and animal manure, while its response to P fertilization was limited.

Responses of pepper to Alfalfa mosaic virus and manganese nutrition under greenhouse conditions: preliminary results

Purpose: The present research was conducted to evaluate interactive effects of manganese (Mn) and Alfalfa mosaic virus (AMV) on some physiological characteristics of two pepper varieties including PS301 and California Wonder under greenhouse conditions. Research Methods: Treatments included two levels of virus infection (infected and non-infected), three levels of Mn concentrations (No manganese: 0ppm, 5ppm and 10ppm) and two varieties (California Wonder and PS301). After three weeks, total chlorophyll (Chl), carbohydrate, antioxidants, phenolic compounds, dry weight and proline were measured in aerial parts. Findings: The highest antioxidant activity observed in California Wonder treated with AMV and 5ppm Mn. The highest total Chl observed in PS301 when treated with 10 ppm Mn. Interaction between Mn and AMV showed the highest dry weight in virus infected plants without Mn supplying. Simple effects of AMV did not influence on total Chl, total carbohydrate and antioxidant, but significantly dcreased dry weight. Application of Mn significantly increased proline and carotenoid contents in infected plants. Research limitations: analysis of proteins that play important roles in resistance mechanism to plant viruses has not been measured because of restriction of accessibility of western blotting at the University of Birjand. Originality/Value: It is concluded that AMV infection could be ameliorated by manganese supplying because of improvement of antioxidant system and phenol content that lead to viral tolerance in pepper.

Production systems and methods affect the quality and the quantity of saffron (Crocus sativus L.)

Aim of study: Comparison of saffron flowering between open field and controlled environment. Possibility of saffron transplanting.Area of study: University of Birjand (Iran)Material and methods: In a first experiment, saffron yield and quality produced by traditional production system (TPS) and by soilless one (SPS) were compared. In a second experiment, the effects of the production method, by direct planting (DP) or by transplanting plant (TP) in open field were studied.Main results: Percentage of flowering corms grown by SPS was 39% and 65%, while by TPS was 6% and 56% in 2018 and 2019, respectively. Flower and stigma yields were significantly higher by SPS than by TPS. Stigma obtained from SPS had higher L (lightness) and crocin. Safranal content was higher in stigma produced by TPS. Leaf and root numbers and corm weight were higher for SPS, but after transplanting there was better status for DP than for TP. At the end of the first growing season (2018-19), mean replacement corms weight (4.4 vs 3.0 g), replacement corms yield (21.3 vs 12.8 g per plant), weight of main replacement corm (11.7 vs 6.0 g) and number of large replacement corms (0.6 vs 0.1 corms per plant) for DP were significantly higher than for TP. However, during the second growing season (2019-20), the plants in TP plots improved their performances.Research highlights: Saffron production was more favorable under controlled environment. Transplanting is possible, but there is a need to improve methods to gain more favorable results.

اثر سطوح مختلف رطوبتی و سولفات آهن بر رشد و محتوی برخی از عناصر در گندم (.Triticum aestivum L) رقم روشن

بسیاری از اراضی کشاورزی در مناطق خشک و نیمه‌خشک، با کمبود آب و عناصر غذائی مخصوصا عناصر غذائی کم ­نیاز مواجه هستند. در این راستا، این تحقیق با هدف بررسی اثرات کاربرد خاکی سولفات آهن در شرایط رطوبتی مختلف بر روی خصوصیات رشدی گندم رقم روشن، به‌صورت آزمایش فاکتوریل دوعاملی در قالب طرح بلوک­های کامل تصادفی با 4 تکرار در گلخانه تحقیقاتی دانشکده کشاورزی دانشگاه بیرجند در سال 1391 انجام شد. عامل اول شامل چهار سطح سولفات آهن (صفر، 50، 100 و 150 میلی­ گرم بر کیلوگرم خاک) و عامل دوم نیز شامل دو سطح مختلف رطوبتی (50 و 100 درصد رطوبت ظرفیت زراعی خاک) بود که از طریق توزین روزانه گلدان­ها کنترل می­شد. برداشت اندام هوائی گیاه بعد از گذشت 8 هفته صورت گرفت و صفاتی چون ارتفاع بوته، تعداد برگ، سطح برگ، شاخص سبزینگی و محتوای نسبی آب برگ، درصد نیتروژن، درصد پروتئین، درصد پتاسیم و محتوای آهن برگ اندازه ­گیری شد. نتایج نشان داد که مصرف سولفات آهن روی درصد نیتروژن برگ و محتوای آهن برگ تأثیر معنی­ داری داشت. کاهش سطح تأمین رطوبت منجر به کاهش 31 درصدی ماده خشک تولیدی، 5.8 درصدی ارتفاع بوته، 37 درصدی تعداد برگ، 22 درصدی تعداد ساقه در بوته، 33 درصدی سطح برگ، 16.8 درصدی محتوی نسبی آب برگ، 5.45 درصدی شاخص سبزینگی و همچنین افزایش 18.2 درصدی نیتروژن برگ، 17.9 درصدی پتاسیم برگ و 23.7 درصدی پروتئین برگ شد. افزایش کاربرد 100 میلی­گرم سولفات آهن بر کیلوگرم خاک نیز محتوای آهن برگ را در حدود 100 درصد افزایش داد. به‌طورکلی کاربرد کود سولفات آهن منجر به بهبود رشد گندم تحت تنش خشکی شد.

Petrography, geochemistry and tectonic setting of adakitic bodies in the Tighanab area and their relationship with iron skarn mineralization (southeast of Sarbisheh-east of Iran)

Petrography, geochemistry and tectonic setting of adakitic bodies in the Tighanab area and their relationship with iron skarn mineralization (southeast of Sarbisheh-east of Iran)

The possibility of improving saffron (Crocus sativus L.) flower and corm yield through the irrigation and soil texture managements

In order to study the effect of soil texture and irrigation management on flower and corm yield of saffron (Crocus sativus L.), an experiment was conducted at research field of Agricultural Faculty of Sarayan, University of Birjand during two growing seasons (2013–2015). The study was performed as factorial based on Randomized Complete Block Design. Experimental factors were irrigation intervals (every one and two weeks equal to 3000 and 1600 m3. ha−1 as normal and deficit irrigation, respectively) and soil texture (100 % soil, 75 % soil+25 % sand, 50 % soil+50 % sand, 25 % soil+75 % sand and 100 % sand). Results of the first flowering season showed that maximum number of flowers (74.33 No. m-2) and yield of dry stigma (3.216 kg.ha-1) obtained in one week irrigation interval with 50 % sand+50 % soil. The maximum values of these traits (308.2 flower per m2 and 9.37 kg.ha-1 dry stigma) during the second year were gained in one week irrigation interval with 75 % sand+25 % soil. The highest amounts of large (≥9 g) replacement corms number (111 and 200 No.m-2) and yield (11,289 and 21,582 kg.ha-1) were obtained by one week irrigation interval and 25 % sand+75 % soil and 75 % sand+25 % soil at the end of first and second growing seasons, respectively. Furthermore, one week irrigation interval increased replacement corms yield by 20 % compared with two weeks irrigation intervals in both growing seasons. Therefore, it was concluded that selection of moderate and light soil texture and shorter irrigation intervals (equal to 3000 m3. ha-1) are important factors for improving flower and corm yield of saffron.

The role of materialism, hoarding behaviours and narcissism in shopping addiction in female students

The aim of present study was to investigate the role of materialism, hoarding behaviors and narcissism in shopping addiction among female students. This research was a descriptive-correlational study. The statistical population consisted of all female students of Islamic Azad University of Birjand, in the academic year 2017-2018. The sample consisted of 250 students were selected by multi-stage cluster random sampling. They completed the Bergen Shopping Addiction Scale, Materialistic Values Questionnaire, Hoarding Behaviors Questionnaire and narcissism subscale of measure of the Dark Triad. The data were analyzed using Pearson correlation and multiple regression analysis. The results showed that materialism, hoarding behaviors, and narcissism have significant relationship with shopping addiction in female students. Hoarding behaviors and materialism were able to predict the shopping addiction in female students, but narcissism were unable to predict the shopping addiction. According to the results of this study, hoarding behaviors and materialism play an important role in shopping addiction in female students. Thus, attention to these variables in prediction of shopping addiction by researchers, behavioral sciences specialists and therapists is necessary.

Photometric and periodic investigations of W-type W UMa eclipsing binary BB Peg

In this study, photometry was conducted for the W UMa type eclipsing binary BB Peg through V and R Johnson filters during several nights in September and October 2016. The light curves were obtained at Dr. Mojtahedi Observatory, of the University of Birjand, Iran. Data reduction was performed using IRIS software. Orbital parameters were obtained by analyzing the light curves using PHOEBE software. The radial velocity information was then used to obtain the absolute parameters of the system. Some minimum light times were obtained forthe system and variations in the orbital period of BB Peg were analyzed by adding the new minimum light times to the O-C diagram to obtain a new ephemeris for the system. The period change appeared to be due to the light-time effect. A justifiable fit was obtained using the third and fourth stars. However, this fit was not confirmed and it may need revision when further data are obtained. The variation could be attributed to other sources, such as magnetic cycles or non-conservative mass transfer from the system.

The role of leadership styles in organizational citizenship behavior through mediation of perceived organizational support and job satisfaction

This paper seeks to examine transformational and transactional leadership, employees’ organizational citizenship behavior, employees’ job satisfaction and perceived organizational sup­port; which are employees' organizational citizenship behavior associations. In addition, this study explores the mediating role of employees’ job satisfaction and perceived organizational support in the relationship between transformational and transactional leadership styles and employees’ organizational citizenship behavior. The study was conducted at the University of Birjand, Iran, on a sample of 250 employees. This research follows a descriptive and correlational approach. Our findings show that transformational leadership and employees’ job satisfaction and perceived organizational support positively and significantly influence employees’ organizational citizen-ship behavior. Additionally, results revealed that employees’ job satisfaction mediates the asso­ciation between transformational and transactional leadership and employees’ organizational citizenship behavior. Moreover, employees perceived organizational support mediates the asso­ciation between transformational and transactional leadership and employees’ organizational citi­zenship behavior. Iranian organizations, especially universities, should invest in transformational leadership and job satisfaction, as well as in the selection of managers with transformational lead­ership styles and employees who are eager to work at the university, in order to enrich the organi­zational citizenship behavior of employees.

The Mediating Role of Stress-Coping Strategies on the Relationship between Thinking Styles and Mental Health of Nursing and Midwifery Students

Background & aim: Mental health of medical students is important for working in clinical settings; therefore, it is necessary to know effective mediators in mental health. This study aimed to investigate the mediating role of coping strategies on the relationship between the thinking styles and mental health of nursing and midwifery students. Methods: In this descriptive correlational study, a total of 180 nursing and midwifery students were selected from Islamic Azad University of Birjand, Iran in 2018. Data were collected using valid and reliable questionnaires including personal and social date, general health, as well as thinking styles and coping strategies of Lazarus-Folkman. The questionnaires were completed on a self-report basis by the students. Data were analyzed by AMOS software 20 version and statistical tests, including t-test and correlation matrix. Results: Legal thinking did not have a significant effect on mental health through a problem-oriented strategy (P=0.217); however, it had a significant negative relationship with mental health through an emotional-oriented strategy (P=0/006). The executive thinking had a positive effect on mental health through a problem-oriented strategy (P<0.001), and a negative relationship with mental health through an emotional-oriented strategy (P<0.001). Furthermore, judicial thinking had a positive effect on mental health through a problem-oriented strategy (P=0.046), and a significant negative relationship with mental health through an emotional-oriented strategy (P=0.048). Conclusion: Thinking styles had a meaningful relationship with the mediation of coping strategies with mental health. Emotion-Oriented and problem-oriented strategies created negative and positive relationships between thinking styles and mental health of the students, respectively.

Evaluation of drought tolerance of triticale (xTriticosecale Wittm. ex A. Camus) genotypes along with bread wheat and barley genotypes

The effects of drought stress on morphological and yield traits of six different genotypes of triticale along with wheat and barley were studied. The experiment was conducted in agricultural college of Sarayan, University of Birjand in 2016-2017 growing season. Experiment was a split-plot experiment based on randomized complete block design with drought stress in main plots and eight mentioned genotypes in subplots in three replications. Results of analysis of variance and means comparison analysis showed significant and negative effect of drought stress on grain yield and biological yield of all investigated genotypes. There was significant difference among investigated genotypes of triticale, wheat, and barley for grain yield under drought stress at 1 % probability level. Pazh genotype of triticale was found as the most drought tolerance genotype, among all investigated genotypes, based on almost all drought tolerance indexes. The highest significant correlation with grain yield was related to biological yield, harvest index, spike/shoot ratio, height and straw yield. GGE biplot analysis of genotypes based on their Yp and Ys showed that Pazh, Jualino, and Sanabad genotypes of triticale had more trends to Ys principal component than ET-89-11 line, wheat, and barley genotypes, therefore show more tolerance to drought stress.

Evaluating the effect of sowing date and drought stress on morphological and functional characteristics of three genotypes of winter oilseed rape (Brassica napus L.)

To assess the effects of drought stress and sowing date on phenological, morphological, and yield traits of three different cultivars of winter oilseed rape (Brassica napus L.), this study was conducted in research farm of Sarayan agricultural college- University of Birjand in 2016-2017 growing season. Experiment was conducted in a split-factorial based on the randomized complete block design with drought stress in the main plots and three sowing date (September 22, October 6, and October 22) along with three cultivars of canola (‘Homolious’, ‘Hayola50’, and ‘DK7070CL’) in the subplots in three replications. The results of analysis of variance and means comparison analysis showed significant and negative effect of drought stress on seed yield and biological yield traits of investigated cultivars of canola. The interaction effect of drought stress × sowing date × cultivar was only significant on leaf twisting trait at 1 % probability level. ‘Homolious’ was assigned as the most drought tolerance cultivar, based on SI, SSI, RDI, TOL, MP, STI, GMP, YI, YSI, and HARM drought tolerance indexes, whereas ‘Hayola50’ was assigned as most drought sensitive cultivar of oilseed rape.