The effect of irrigation with water at salinity concentrations of 1.5 and 3.0 dS m-1 on the response of soybean was studied during two seasons at the Lower Valley of the Colorado River (39°23'S 62°37'W), Argentina. These saline conditions reduced leaf water potential. Salinity had a negative effect on leaf development and there was a reduction in shoot dry weight. Plant roots were less sensitive to saline conditions than plant shoots. Root growth increased in the upper part of the soil (0 – 0.20 m). Nutrient composition of plant tissues was altered by salinity. Saline stress produced a significant increase in leaf sodium and chloride concentration but reduced the accumulation of potassium, calcium and magnesium. There was also a decrease in phosphorus concentration.
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