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The effect of salinity (NaClCaCl2) on the evolution of mineral ions (Na , K and Ca) and the variation of (Na/K and Na/Ca ratios) in the roots of a Rio grande (Rg) tomato variety (Lycopersicon esculentum Mill., Solanales Solanaceae) at the 5-leaf stage was investigated. After germination of the seeds, the seedlings obtained are transferred to their environment to receive the nutritive solution. At 5 leaf stage, salt stress was applied with four concentrations (0, 100, 200 and 300 meq L-1 NaClCaCl2) for 15 days. The results shows that salt stress increased Na + and decreased K+ content significantly in both cultivars. Increase of salinity resulted in an increase of ions Na and Ca in the tomato root cultivated on the two substrates but a decrease of K+. The Na/K and Na/Ca ratio in roots of both cultivars cultivated on the two substrates increased significantly when concentration of NaClCaCl2 increased in the medium. The presence of calcium in the medium (irrigation solution and bentonite) favored an increase in the average amount of calcium ions in the roots of tomato grown in sand substrate mixed with bentonite compared to those cultivated in the sand substrate alone.

Influence of salinity soil on the sodium, potassium and calcium content of tomato Lycopersicum esculentum Mill. (Solanales Solanaceae) at 5-leaf stage