Effects of potassium and zinc fertilizer treatments on potassium, calcium, magnesium, zinc uptake and K+/Na+ ratio and some physiological responses of two cultivars of Canola under salinity stress

Salinity with accumulating some harmful ions in plants causes negative physiological effects on plant growth. In order to investigation effects of potassium, calcium, magnesium and zinc on morpho-physiological characteristics of tow canola cultivars under salinity stress, the experiment, in 1393 in a randomized complete block design with two factors (factor cultivars and fertilizers) and 4 replications at University of Tehran, faculty of Agriculture and Natural Resources, located in Karaj, was carried out. Factor fertilizers in four levels were considering in critical levels of potassium and zinc in soil where it’s including 500 mg/kg potassium (twice optimum potassium OP), 2.4 mg/kg zinc (twice optimum zinc OZ), 500 and 2.4 mg/kg potassium and zinc (twice optimum zinc and potassium OZP) and control (optimum nutrients status O) and factor cultivars were including Sarigol and Licord cultivars. Results showed in the salinity stress conditions, OP treatment increased Sarigol’s root and shoot dry weight 21 and 26.01 percent more than that of Licord’s root and shoot dry weight. Calcium concentration in the Sarigol’s shoots was 23.66 percent more than Licord in the OP treatment. Magnesium concentration in the Sarigol’s root was 20.32 percent less than the Licord’s root. Sarigol cultivar except LOP treatment, at least 5.38 percent has a more zinc rather than the others. In the OP treatment Sarigol’s shoot Kﳖ ratio was more than that’s ratio in root. Since the vegetables in the salinity stress conditions, they transport ions such as sodium to the aerial parts and for controlling this phenomena are used from Kﳖ ratio, but this phenomena was reverse for Sarigol cultivar and this is represents Sarigol’s exclusion mechanisms to cope with salinity stress whereas Licord cultivar lack of this mechanisms and it’s potassium transport does not follow any particular trend.