Improving quantity and quality of canola oil yield through cobalt nutrition

Field experiment had been done Research and Production Station, National Research Centre, Nubaria location, to study the effect of cobalt on growth, seeds yield, oil yield and oil fatty acids constituents. The experiment containing 13 plots area were 15 m (5 X 3) containing 3 rows each, planted with 10 plants. The seedlings (at the third truly leaf) were irrigated with cobalt sulphate once with the different cobalt concentration: 0.0, 2.5, 5.0, 7.5, 10.0, 12.5, 15.0, 17.5, 20.0, 22.5, 25.0, 27.5 and 30 ppm. All the plants received natural practices whenever they needed.The obtained results could be summarized in the following: Applying cobalt in suitable concentration gave a significant increase in the yield compared the control. Cobalt addition of 12.5 ppm gave a synergistic effect on canola growth, seed yield, oil yield and oil quality compared to untreated plants. Cobalt treatments increased all the tested growth parameters, contents of macronutrients (N, P and K), micronutrients (Mg, Zn, Fe and Cu) and chemical contents in canola seeds as compared to control plants. Cobalt content in the canola seeds was in a sub range for human safety health.