Abstract
The following research was conducted to study the affection of cobalt element at the two concentrations (30) and (60) mg / kg soil and the nickel element at the two concentrations (30) and (60) mg / kg soil on growth and some physiological characteristics of the mint plant. It was found that the treatment of the soil with a nickel element at the concentration of (60) mg / kg of soil led to a reduce in the weight of the shoot and root groups and the concentration of chlorophyll in leaf tissues and an increase in the infiltration of potassium , sodium ions and the evidence of damage in the leaf tissues of the mint plant, which amounted to (0.171) g and ( 0.030 g / m (0.717 mg / g in lean weight, (50) mg, (5) mg, and (96.842)%, respectively compared to the control treatment and other treatments . While it was observed that the treatment of the soil with a cobalt element at a concentration of (60) mg / kg of soil led to a decrease in the concentration of calcium and magnesium in the shoot and root groups of the mint, as it reached (21.0), (6.0), (3.2) and (18) mg respectively. Compared to the comparison and other transactions. As for the effect of the element type, we note that the nickel component was more effective in reducing the dry weight of the two shoot and root groups, the concentration of chlorophyll, and the increase in potassium infiltration compared to the effect of the cobalt element, which in turn affected more on other traits compared to the effect of the nickel element.

Key words: Effect of Ni and Co on plant growth, Infiltration of K and Na, Chlorophyll