Introduction Development of new canola (Brassica napus L.) varieties need effective tools to monitor characterizes association in yield and its components. Although, determination of the response of oil seeds cultivars to environmental variables is one of the principal of agriculture planning to achieve maximum qualitative and quantitative yield. Water deficit stress and sufficient nutrition are the most important factors limiting yield production by changing the physiological processes of the

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... lant. Iran is considered as the arid and semi-arid with average rainfall of 250 mm. On the other hand, 33% of agriculture land is devoted to dry cultivation. Water deficit by affecting on vegetative and reproductive growth period and balance between them will change yield and product quality. Materials and Methods In order to study the responses of three winter canola cultivars to late season drought stress and foliar application of Mn and Zinc sulfate fertilizer on physiological, morphology characteristics and yield, a split factorial experiment was carried out based on randomized complete block design with three replications in 2017-2018 at the Karaj province. Irrigation in two levels, normal and water holding at flowering stage to next, foliar application in four levels, sprayed with water (control), foliar application with zinc sulfate, foliar application with Mn sulfate, foliar application composition with zinc sulfate and Mn sulfate (each of them was with concentration of four per thousand) both in main plot and three cultivars included Nima (control) and two new lines KS7 and R15 in sob plot. Foliar application was applied during the stem elongation stage. When the 50% of pod appeared total chlorophyll and leaves carbohydrate solution content was measured as index of drought stress damage. Eight traits were measured on 10 random plants per plot. The traits were plant height, number of pods /plant, number of seeds/pod, 1000 seed weight, seed yield, biomass yield, oil percentage and oil yield. Results and Discussion T [...]