Fig. 3. Effect of soil moisture content on the composition of the soil solution of an Oxisol with no amendment (left), an Oxisol with NaCl added at 1 g kg^–1 (middle), and an Oxisol with CaSO₄·2H₂O added at 10 g kg^–1 (right). The dotted lines without data represent the expected ionic strength that would result from a decrease in moisture content without any interaction with the soil solid phase. The vertical bars represent the standard deviations from the mean of four replicates.