In order to investigate the effect of planting orientation and arrangement on yield and yield components of Sunray green bean (the Netherlands), an experiment was conducted as factorial based on RCBD with three replications in the Farm Research of Gonbad Kavous University in 2013. Levels of planting arrangement were 20×20, 30×13.3 and 40×10 cm (fixed density of 25 plants m-²) and the levels of planting orientation were northern- southern, eastern-western, north eastern –south western and north western –south eastern. The results showed that the effect of planting orientation on the number of pod/plant, number of seed/plant, 100-seed weight, seed yield, plant dry weight and harvest index were significant. The Effect of planting arrangement on plant height, number of branch/plant, number of seed/pod, 100-seed weight and plant dry weight was significant. The effects of planting orientation × planting arrangement on the number of pod/plant and seed yield were significant. Maximum plant height, branch/plant, number of seed/ pod, 100-seed weight and plant dry weight were belonged to planting arrangement of 40×10, 20×20, 40×10 and 40×10 cm. plant dry weight in northern- southern direction with 11.22 gr were greater than other directions. Seed yield in planting arrangement of 40×10 cm and planting orientation north western –south eastern with 1444 kg was greater than other treatments

In this Research, the effects of different nitrogen fertilizer rates in wheat parents (Azar-2 cultivar) on seed vigour, seedlings establishment and grain yield were evaluated. Laboratory tests based on CRD with 5 treatments and 4 replications along with a field experiment based on completely randomized block design with five treatments and four replications were carried out in Dryland Agricultural Research Institute (DARI), Maragheh in 2011-2012. In this research the seeds of wheat that they were produced with various rates of nitrogen fertilizer (0, 30, 60, 90 and 120 kg/ha) were used. The nitrogen contents of seeds on the basis of percentage in the parent plants in the different rates of nitrogen fertilizer were measured. In addition, the measurement of nitrogen indicated that the seeds which were produced in the different rates of nitrogen had a significant difference among themselves. Laboratory results showed that electrical conductivity (EC) of seeds leakages, dry weight of root and shoot of seedling, seedling dry weight, germination percentage and the mean of germination time were significantly affected by nitrogen. Means comparison data showed that the highest electrical conductivity (EC) of seeds leakages, germination rate, radicle, plumule and seedling dry weight, seed nitrogen percentage, were related to 90 and 120 kg.ha of nitrogen use in parent plants. The field results showed that protein percentage, emergence rate, mean time of emergence, percentage of seedlings establishment, green cover percentage of flowering, number of spik per m² and number of fertile tillers and biologic yield were significantly affected by nitrogen use on the parent plants. These results indicated that the use of 90 kg.ha nitrogen fertilizer in the parent plants for Azar-2 had positive and significant effect on seed vigour, seedlings establishment and grain yield. 

In order to evaluate the effect of Trichoderma harzianum on cadmium (Cd) absorption in wheat (Triticum aestivum L.) a pot experiment was conducted in factorial arrangement based on completely randomized design with three replications. Treatments consisted of two levels of fungi inoculation (inoculated and non-inoculated) and four levels of cadmium nitrates (0, 50, 100 and 150 mg/L). Results showed that at the level of 150 mg/L cadmium nitrate, the presence of Trichoderma reduced the transfer coefficient and the accumulation of Cd in shoot (30 and 23%, respectively) compared to the control treatment. In the control treatment, increasing cd in soil up to 100 mg/L decreased translocation factor from 1.29 to 0.52 and increased the transfer factor. However in the presence of Trichoderma with increases of Cd concentration, the transfer factor showed decreasing trend. In conclusion, it seems that Trichoderma inoculation in medium and high concentration of cd can accumulate Cd in roots. Therefore, it decreases its transportation to areal parts of wheat.

This study was performed in order to evaluate the effect of different sowing dates on yield and yield components. Treatments were three sowing dates such as (Nov11, Nov22 and Dec1) and four chickpea cultivars (Hashem, Azad, Arman and ILC482). Results showed that the interaction effect of cultivar×sowing date was significant on all traits. The results indicated that the highest height of plant was related to Azad cultivar in the first and third sowing dates. Moreover, in the second sowing date, the highest height of the plant was related to Arman cultivar. in Nov11and Dec1 planting date Azad cultivar and in Nov22 sowing date Arman cultivar had the highest plant height. Maximum plant height (54.1 cm) was recorded for Arman cultivar at the second sowing date and minimum plant height (25.7 cm) was recorded for Hashem cultivar at the first planting date. Hashem cultivar had the highest biomass and number of main branch per plant at second sowing date. Also, the maximum number of seeds per plant (44) was recorded in ILC482 at second sowing date and maximum 100 seed weight (29.2 g) was recorded for Azad cultivar at the second and third sowing dates. In the first and second sowing date Hashem cultivar and in the third sowing date Azad cultivar had the highest seed yield. Maximum seed yield (2490 kg.ha^-1) was Hashem at second sowing date and maximum seed yield (1260 kg.ha^-1) was observed for this cultivar at third sowing date and was 49.3% less than second sowing date. In ILC482 maximum seed yield was obtained for the second sowing date.  Based on the results of the present study to achieve the highest seed yield in Kermanshah condition Hashem cultivar could be cultivated at the second sowing date.

In order to study the effect of foliar application of salicylic acid and lime sulfur on indices of tomato seedling, on three replicated, factorial arranged RCB design experiment was conducted in the green house of Gorgan University of Agricultural Sciences and Natural Resources during 2015. In this study, the first factor was foliar application of salicylic acid (SA) at four levels [zero (SA1), 10^-6 (SA2), 10^-4 (SA3) and 10^-2 molar (SA4)] and the second factor was the lime sulfur (LS) at two levels [zero (LS1) and five percent (LS2)]. The first foliar application was treated after the appearance of third real leaf (20 days after planting) and was repeated every 10 days (five times foliar application). Finally, the most important characteristics of transplants in nursery such as, number of leaves, fresh and dry weight of stem and root, number of days until the appearance of the first inflorescence, anthocyanin, total chlorophyll and carotenoids of leaves were evaluated. In a general conclusion, the highest values were related to control plants traits such as number of leaves (8.1), fresh (1.17g) and dry weight of root (0.1g), fresh (4.1g) and dry weight of stem (1.53g), total chlorophyll (475.1mg/g F.W.) and carotenoid (154.65mg/g F.W.) of leaf. In addition the control plants had more suitable characteristics to produce. But control plants had the highest number of days until the appearance of the first inflorescence (67 days). However, in this study, the interaction between lime sulfur and salicylic acid on tomato transplanting quality was not remarkable, but interactions in some traits suggest the importance of further studies in this field.

A field experiment was conducted to evaluate the effect of foliar application of solo-potash on yield and yield components of chickpea on different plant density in rain-fed condition in Sabzevar University Research Farm, during 2012-2013. The experiment was laid out on the basis of randomized complete block design under factorial arrangement with three replications. Factors were: foliar application of potassium (control, vegetative phase, reproductive phase and vegetative+ reproductive) and plant density (10, 20 and 30 plant.m^-2 respectively). The results showed that foliar application of solo-potash on vegetative + reproductive had the maximum plant height (28.75cm), branch number (8.33 branch per plant), pod per plant (20.71), biological yield (994.44 kg.ha^-1) and economic yield (488.49 kg.ha^-1). Increasing plant density plant height augmented (5.12%), lateral branch number (16.55%), pod per plant (32.06%) compared to 10 plant. overall, foliar application of solo-potash on vegetative + reproductive stage and 20 plant.m^-2 produced the highest economic yield (480 kg.ha^-1) on rain-fed condition.

Use of saline water in agriculture is necessary because of limited fresh water resources. The study was carried out to evaluate the effect of water quality and organic and chemical fertilizers on content nutrients, ash in seed and chlorophyll index of borage. The experimental design was a split plot with two irrigation sources: irrigation with fresh and saline well-water comprising the main-plots, and four fertilization systems: application of NPK at 80:40:30 kg ha^-1, 40000 kg ha^-1 of manure, NPK at 40:20:15 kg ha^-1 plus 20000 kg ha^-1 of manure and no soil fertility as sub-plots that were applied with three replications. The experiment was conducted in 2012 growing season at the Research Farm in Zabol University, Iran. Salt irrigation water significantly increased concentration of ash, chlorine and sodium in seeds. The low quality of irrigation water reduced nitrogen, phosphorus, magnesium, potassium and calcium in seeds. Application of fertilization significantly increased all studied traits compared with the control except magnesium. Combinations of organic and inorganic fertilizer were more effective from sole application. Interaction of water quality with different systems of fertilization was significant on the concentrations of sodium, chloride, calcium and chlorophyll index; therefore the combination of organic and chemical fertilizer not only reduced. The concentration of elements that create salt damage (sodium and chloride), but also improved the absorption of macronutrients.

In order to investigate the effects of planting pattern and split application of nitrogen fertilizer on qualitative traits and grain yield of rice (var. Koohsar) in second cropping, a field experiment was conducted as split-plot in randomized complete block design with three replications in Research Farm of Amol University in 2013. The treatments included planting pattern in three levels: D1:25×25, D2: 20×20 and D3: 30×10 cm² as main plot and time of nitrogen split application in five levels (T1: 100% basal fertilizer, T2: 50% basal + 50% tillering stage, T3: 50% basal + 50% panicle initiation stage, T4: 33.33% basal + 33.33% tillering stage + 33.33% panicle initiation stage and T5: 33.33% basal + 33.33% tillering stage + 33.33% full heading stage) as sub plot were studied. Results showed that decreasing of planting density (25×25 cm) and increasing of N split, augmented the qualitative traits. But, with the increasing planting density (30×10 cm), the grain yield increased by 13.8%. Considering interaction effects, the longest grain before cooking was observed in treatment D1T4. The maximum grain yield (3874 kg.ha^-1) was observed in treatment T5 split. It could be concluded that the planting pattern of 25×25 cm and splitting of nitrogen fertilizer application in vegetative and reproductive stages, may improve the qualitative yield. However, the planting pattern of 30×10 cm and T3, T4 and T5 split cause the increase of quantitative yield of rice (var. Koohsar) in the second cropping.

In order to investigate the effects of mycorrhiza, phosphor, and salt stress on phosphor concentration in shoot and morphological traits of alfalfa (Medicago scutellata L.) a pot experiment was conducted in a factorial based on a randomized complete design with four replications at Agricultural Research Station in Gonbad Kavous University, Iran during growing season in 2012-2013. The treatments were the combination of mycorrhiza factors (lack of mycorrhiza inoculation and mycorrhiza inoculation), phosohor fertilizer factor (0, 50 and 100 mg kg^-1 soil) and water salinity factors (irrigation by water salinity zero, 2 and 4 ds m^-1). Results showed that mycorrhiza inoculation had a significant effect on the increase of root dry weight and shoot dry weight, root to shoot dry weight ratio, root length, colonized root length, the percentage of root colonization and phosphor concentration in shoot. However with the application of phosphor, shoot dry matter, root to shoot dry matter ratio and root length and phosphor content of shoots were increased significantly. Water Salinity significantly reduced root length. The highest amount of root dry weight, shoot dry weight, root to shoot dry weight ratio and phosphor concentration in shoot were obtained from mycorrhiza inoculation and 100 mg kg^-1 soil phosphorus. The results showed that application of phosphorus fertilizer and mycorrhiza through symbiosis with plant and via developing its mycelium in soil, caused better water and nutrient element absorption, thereby improving the growth and development of the plant. 

In order to study the effect of bio-fertilizers in the form of seed inoculation on the seedling growth of five wheat (Triticum aestivum L.) cultivars, greenhouse experiment was conducted as a factorial based on a randomized complete design with three replications at the Agricultural Institute in the Zabol University, Iran during 2014. The first factor consisted of five cultivars of wheat (Sistan, Kavir, Aflak, Hirmand and Arg) and the second was bio-fertilizer types (phosphate solubilizing bacteria, bio-phosphore, nitroxin, nitrokara, mixed (phosphate solubilizing bacteria+bio-phosphore+nitroxin+nitrokara) and control). Properties of length of shoot and root, fresh weight and dry weight of shoot and root, leaf number per plant and ratio of root dry weight to shoot dry weight were measured. Results showed that the effects of cultivars were significant on length of shoot and root, dry weight of shoot and root, fresh weight of shoot and root, leaf number per plant, the ratio of root dry weight to shoot dry weight of wheat cultivars. In addition, the effects of bio-fertilizers were significant on root length, root dry and fresh weigh, and shoot dry weight. The highest root length (28.7 cm) was observed in nitroxin application. The effects of interaction between wheat cultivars and bio-fertilizers were significant for the dry and fresh weight of the root. The results also demonstrated that the highest fresh weigh of the root (2.8 mg) was observed in bio-phosphore application and Arg cultivar. Based on the results of this experiment the use of the bio-fertilizers in the recommended amount can have a significant effect on the growth characteristics of wheat.

In order to study the effects of environment and silicon spray on the growth of the vegetative of different rice (Oryza sativa L.) cultivars, a pot experiment was conducted as a randomized complete design with three replications in the greenhouse of deputy of Rice Research Institute of Mazadaran (Amol), Iran. Treatments included the five cultivars of Tarom Mahali, Shiroodi, Fajer, Keshvari and Khousar in two environments (greenhouse and open space) with silicon spray (5% silicon ligules fertilizer) at a mid-tillering stage on one plant per pot. During the maximum tillering stage, plant height, leaf area, leaf, stem, root and total dry weight were measured. The highest dry weight of stem and leaf Tarom Mahali and Fajer cultivars in the greenhouse with the silicon spray were 1.92, 1.81, 1.87 and 1.89 gram per hill, respectively. The greenhouse environment in comparison to open place environment increased 30-70 percent of vegetative growth of rice cultivars in tillering stage. The silicon spray in the open space environment compared to greenhouse did not have a positive effect on the vegetative growth of rice cultivars. The silicon spray was not effective in decreasing low temperature on the rice growth in the autumn. In the open space, Khousar and Tarom Mahali cultivars had better vegetative growth than the other rice cultivars

In order to evaluate the effects of living mulch of common vetch (Vicia sativa L.) on yield and yield components of maize (SC.704 cultivar), experiment was conducted as a split-split plot based on randomized complete block design with four replications in Meteorology Station of Fars province, city of Firoozabad, Iran during 2015. Time of suppression of living mulch of common vetch (4, 6 and 8 leaf stages of corn using 2,4-D herbicide with the amount of 750 ml ha^-1) was arranged in main a plot and common vetch density in three levels (10, 20 and 40 plants m^-2) with two levels of no weeding and weeding were implemented in sub-plots. Results indicated that suppression time and living mulch density had a significant effect on seed yield, but their interactions were not significant. The results showed that suppression of living mulch at stages of 6 and 8 corn leaves led to minimum (9.5 ton ha^-1) and maximum (11.8 ton ha^-1) seed yield, respectively. Among the used treatments, weeding at the whole season and weedy check in the season showed the highest seed yield (13.141 ton ha^-1) while non-weeding showed the lowest seed yield (8.942 ton ha^-1). Suppression time and density of vetch living mulch had significant effect on ear number per plant, ear length, ear diameter, number of rows per ear and number of grains per row. Overall, the results demonstrated that living mulch application at density of 10 plant m^-2 and its suppression at the 6 leaf stage of corn were increased yield.

The heavy metal (Ni, As, and Al) is one of the most important cause of stress in the environment. The aim of this study was the investigation the effect of nickel nitrate on some of morphological and biochemical properties in coriander (Coriandrum sativum L.). The experiment was conducted as a randomized complete block design with four replications in Damghan University, Iran. Treatments included 0, 100, 200, 500 µM nickel in hogland dietary solution. After two weeks of treatment, the plants were harvested for necessary tests. Results of variance analysis showed that increasing nickel concentration reduced the dry weight root and shoot as well as root and shoot lengths. The results of biochemical parameters demonstrated significant reduction in chlorophyll (a and b) and protein content, but the amount of soluble sugars, anthocyanins, proline and carotenoid increased significantly. Also, with the increasing of nickel levels, nickel accumulation increased both in shoot and root; as a result, a large amount of nickel was accumulated in the roots to shoots. The results indicated that the accumulation of nickel was more in the root than aerial parts (transmission ratio less than 1), and therefore cannot be regarded as a storing plant.

In order to evaluate the effects of initial seed phosphorus content (through different phosphorus use on parent plants) and planting density on growth properties and yield of three barley (Hordeum vulgare L.) cultivars, experiment was conducted as a factorial split plot based on randomized complete block design with three replications during 2011-2013 in the Dryland Agricultural Research Institute, Maragheh, Iran. The first factor was cultivar (A₁= Sahand, A₂= Abidar and A₃= Dayton), second factor was primitive seed phosphorous content that was applied previous year on parent plants (C₁= 0, C₂= 15, C₃= 30 and C₄= 45 kg ha^-1), and third factor was seed rate (B₁= 300, B₂= 400 and B₃= 500 seed m^-2). Also the content of seed phosphorous percentage after its application in different amounts in the parent plants last year was measured. Results indicated that due to using different amount of phosphorous fertilizers, the amount of phosphorous in the produced seeds had a significant difference. In addition, the results showed that cultivar, seed rate and seed phosphorous content were significantly effective on some measured traits. Interaction of cultivar×seed rate×initial seed phosphorous content showed that treatment of A₃×B₃×C₃ (Dayton with the seed rate of 500 seed m^-2 and 30 kg ha^-1 P applied for parent plants), had the highest 1000-seed weight (40.2 gr), productivity degree (92.6), biological yield (3868 kg ha^-1) and seed yield (2463 kg ha^-1). The effect of seed phosphorous indicated that Dayton had the highest initial phosphorous in the seed. The seed phosphorous was also effective in enhancing dry matter as well as seed yield ultimately, it was also essential in improving the early establishment, growth and yield. ‏This research showed that the amount of seed phosphorous, cultivar and seed density contributed to yield increase.

In order to study the drought stress of post-anthesis stage effect on agronomic characters and some of physiological traits in flag leaf and spike of different wheat genotypes, an experiment was carried out in factorial randomized complete block design with three replications. Two levels of irrigation: control (irrigation in all growth steps base on irrigated conditions) and drought stress (irrigation cut after anthesis stage until the end of growth period) as the first factor and different wheat genotypes (TEVEE'S'//CROW/VEE'S and Shark: sensitive, Manning/Sdv1/Dogu8 and Sabalan: semi tolerant, Sardari HR-86 and Dogu88/Ghafghaz7: tolerant) as the second factor were considered. Results showed the drought stress led to grain yield decrease through reducing thousand grain weights. Maximum grain yield was observed in the semi tolerant genotype Manning/Sdv1/Dogu8 and Shark genotype showed the minimum grain yield. Soluble protein content increased under stress condition. Maximum and minimum soluble protein content in flag leaf were observed in Sardari HR-86 and Shark genotypes, respectively and in spikes, the highest soluble protein content was observed in Manning/Sdv1/Dogu8 while the lowest observed in Shark. Catalase, peroxidase, ascorbate peroxidase and superoxide dismutase enzymes activity increased under the drought stress condition. The highest enzyme activity was observed in flag leaf of Sardari HR-86 the tolerant genotype and in spikes was observed in Manning/Sdv1/Dogu8 the semi tolerant genotype in the last step of sampling. In addition sensitive genotypes showed the lowest enzyme activity. It seemed that in Manning/Sdv1/Dogu8 genotype, defense system activating of catalase, peroxidase and superoxide dismutase enzymes had a key role in tolerance increase under the drought stress.

Using simulation models with long term meteorological data application is one of the ways of determining the best crop planting pattern. This research was performed in order to determine the best density and sowing date in rainfed wheat (Sardari cultivar) under Urmia environmental condition by using SSM-Wheat model. Selective scenarios were: eleven sowing date (July 28, August 13, August 28, September 12, September 27, October 12, October 27, November 11, November 26, December 11 and  December 26) and seven plant density (375, 400, 425, 450, 575, 500, 525 plant/m²) for 3 years (2009-2011) in Urmia environmental condition. Results showed that density did not have any significant effect on phenological traits; but sowing date caused main changes in them. In the other words, the number of days to maturity decreased about 141 day by switching sowing date from July 28 to December 26. Maximum leaf area and leaf area index significantly decreased at the beginning of seed growth because of plant density increase. Besides, the node number in main stem, crop mass in grain filling period and portioning coefficient were affected by the sawing date. Results showed maximum grain yield and harvest index were obtained in September 12 sowing date and 425 plant/m² planting density. Therefore, in order to obtain higher yield achievement in the abovementioned region, planting in the last one third of September and 425 seed rate per square meter should be considered in future researches

In order to evaluate planting date effect on yield and yield components of safflower cultivars, an experiment was conducted in factorial based on randomized complete blocks design with four replications at research farm of Vali-e-Asr University of Rafsanjan in 2012. Factors were included three planting date (4 April, 25 April and 16 May) and four cultivars (411, Local Esfahan, Sina and Sofeh). Results demonstrated that the yield components affected by planting date and cultivar, so that, earlier planting was led to more head number per plant, grain number per head and 1000 grain weight. Local Esfahan and Sofeh cultivars had the maximum number of grain per head and Sina and 411 cultivars had the highest 1000 grain weight. In the first planting date, the highest grain yield was obtained in 411 cultivar (5044 kg/ha) that did not have any significant difference with Local Esfahan grain yield. Cultivars had no significant difference in grain yields in second and third planting dates. The grain yield ranged from 1575 to 1716.7 kg/ha in second planting date and varied from 823 to 1176 kg/ha in third planting date. Harvest index just responded to cultivar. The maximum harvest index was obtained from Sina cultivar (43%) and it was not significant with 411 cultivar harvest index only. In general, it was concluded that 411 and Local Esfahan cultivars were suitable for cultivation in first planting date.

In order to investigate different irrigation regimes effects, water productivity and proper yield achievement in rice rotation, a research was conducted in factorial based on randomized complete blocks design with three replications at the experimental field of Rice Research Institute (Amol), in 2011. Treatments were four irrigation levels including alternative wetness and dryness (AWD), semi-dry cultivation (SDC), low depth with wetness and dryness combination (SWD), traditional irrigation method (TI) and two rice cultivars of Tarom (Local cultivar) and Fajr (improved cultivar). Results of variance analysis showed that cultivars and irrigation regimes differed significantly in water productivity and paddy yield. However, cultivar×irrigation regimes interaction was not significant. AWD irrigation regime by 4481.70 cubic meter per hectare water productivity (about 39.5 percent more conserved water), gross income to production cost ratio of 1.89 with only 7.6 percent reduction in net profit per area unit (from 44957916 to 41559671 Riyal per hectares) showed the best efficiency in comparison with other irrigation regimes (especially traditional irrigation). Following that, SDC irrigation regimes with gross income to production cost ratio of 1.86 and with about 45.5 percent more water productivity than Ti and 11.5 percent reduction in net profit per area unit (from 44957916 to 39803690 Riyal per hectares). Overall, according to economic analysis, SDC and AWD irrigation regimes should be presented as the superior treatments.

Understanding the ecology of weed seed germination helps to predict the potential distribution and development that might be effective for making strategic practical management decisions. Emerging response of three-weed including wild mustard, jungle rice and milk thistle was evaluated with regard to soil depths (0, 2, 4, 6, 8, 10, 12 and 14 cm) in the greenhouse condition. Using logistic function to quantify the response of emergence to planting depth showed that the emergence percentage declined with increasing the depth of planting. So that, the maximum emergence of milk thistle, wild mustard and jungle rice at 0 centimeter depth was (93.34%), (37.38%) and (30.28%) and the minimum emergence was estimated at 6. 8, 10, 12 and 14 centimeter (zero percent) for wild mustard and jungle rice, respectively. Also, it has been estimated the burial depth of 6.71, 5.79 and 3.15 centimeter was able for 50% inhibition of the maximum seedling emergence of milk thistle, jungle rice and wild mustard. All parameter modeled by Hill function showed that, by increasing depth, time for achieving 50% of germination, time to first seedling emergence (Dlag) and germination uniformity, increased and declined respectively. As, the D50 and Dlag values were at least at depth of 0 cm.

In order to assess the effects of different nitrogen fertilizer rates and planting date on yield and yield components of spring canola cultivars, an experiment was conducted in factorial split plot based on randomized complete blocks design with four replications at the experimental field of Gonbad-e-Kavous University during the growing season 2013-2014. Treatments experiment were included four canola cultivars (Hayola 401, Zarfam, Hayola 308 and RGS003), two planting date (Nov 11 and Dec 21) and three levels of nitrogen fertilizer (0, 75 kg/ha and 150 kg/ha). The results of variance analysis showed that planting date and nitrogen fertilizer had significant effect on yield and yield components. The means comparison demonstrated that with the increase in nitrogen fertilizer application in both planting date, number of grain per pod, number of pods per plant, 1000 grain weight and grain yield increased. Interactions effects showed that with nitrogen fertilizer rates increase, yield and yield components were improved significantly in each planting date. Canola cultivars showed significant difference with  respect to grain yield, and this  occurred in the highest fertilizer rate (100% fertilizer recommendation), appropriate planting date (Nov 11) and in three groups, high (RGS003), middle (Hayola 401 and Zarfam) and low yield production (Hayola 308).