The global demand for crop production is rapidly growing due to the continued rise in world population. Crop productivity varies generally with soil nutrient profile and climate. The optimal use of fertilizers might help to attain higher crop yield in canola. To circumvent nutrient imbalance issues in soil, two separate field trials were conducted to determine the best source of nitrogen (ammonium sulfate/ammonium nitrate), foliar application of gibberellic acid (GA3) and potassium (K) for the

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... anola yield and yield attributes for four consecutive years (2014 to 2018). Both experiments were carried out in randomized complete block design (RCBD) with three replicates. The nitrogen source in the form of ammonium sulfate (0, 10, 20 and 30 kg/ha) and ammonium nitrate (0, 50, 75 and 100 kg/ha) was applied in the rhizosphere. In another experiment, the canola crop was sprayed with four level of gibberellic acid (GA3; 0, 10, 15, 30g/ha) and potassium (K; 0, 2.5, 3.5, 6g/ha) separately or in combination by using hydraulic spryer. The analysis showed that fertilization with nitrogen in the form of ammonium nitrate (100 kg/ha) and ammonium sulfate (30 kg/ha) had a positive effect on the plant height, number of branches, fruiting zone, seed yield per plant, seed yield per hectare of canola except oil percentage. Moreover, canola plants displayed a significant improvement on all studied features with high dosses of GA3 (30 g/ha) and K (6 g/ha) individualy and in combined form. In a nutshell, compared to both source of nitrogen, ammonium nitrate was more efficient and readily available source of nitrogen. Gibbrellic acid being a natural growth elicitor and potassium as a micronutrient serve as potential source to improve yield and to mange nutrient profile of canola.