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Fig. 6. Effect of soil moisture content (presented as the square root of the volume of water in the soil [v, L/kg]) on the Na and Ca ratio (where Na and Ca are the number of millimoles of the ion present in the soil solution of volume v [see Khasawneh and Adams (1967) for details]) for several Vertisols (V, left) and an Oxisol (O, right); S = saline, G = gypsiferous, C = calcareous, S(1) = NaCl added at 1 g kg–1, S(2) = NaCl added at 2 g kg–1.
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