The effect of sodium chloride salinity on plant growth and mineral constituents was studied in 3 cultivars of corn or maize (Zea mays L.) during May-June 1999 at Ordu - Turkey. Corn plants were grown under 5 levels of salinity conditions, 0 mM, 35 mM, 70 mM, 105 mM and 140 mM NaCl. High levels of NaCl caused a considerable reduction in plant height and dry weights of shoot and root. With increasing salinity, uptake of Cl by the roots and shoots of the corn plants markedly increased up to 105 mM of NaCl and then slightly decreased. Salinity favoured accumulation of Na in the roots, whereas Cl accumulation was more pronounce in the shoots. Increasing NaCl salinity resulted in a progressive absorption of Na in detriment of K, thereby increasing Na : K ratio and causing an ionic disequilibrium, which possibly suppressed plant growth.