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- W2048452011 abstract "Natrium - (Calcium + Magnesium) - Austauschgleichgewichte in Böden. Beckett's approach has been used to describe the Na-(Ca + Mg) exchange isotherm in twenty soil samples that differed in texture and salinity. The data obtained from the isotherms were compared with the values of exchangeable sodium obtained by ammonium acetate and the concentration ratios (Na/ °Ca+Mg) calculated from the saturation paste extract. The Na-Q/I relation was always linear for each of the studied soils with no curvature at the lower values of concentration ratio. Values of - Δ Na0 obtained from the isotherms were highly correlated with exchangeable Na (r2 + 0.89). The equilibrium concentration ratios of the isotherms were similar to those obtained from the saturated paste extract in the non-saline soils, and were much lower in the case of the salt affected soils. The slope of the Na-Q/I relation appeared to be a soil characteristic not affected by either Na depletion from the soil or Na addition up to 5 me./100 g. soil. The PBCNa values were highly correlated with the C.E.C. values of the soil (r2 + 0.97). Nach Beckett's Methode wurden von 20 Bodenproben, die sich in Textur und Salzgehalt unterschieden, Na-(Ca+Mg)-Austauschisothermen erstellt. Die für die Isothermen charakteristischen Werte wurden verglichen mit dem Gehalt an austauschbarem Na (Ammoniumacetat) und dem Ionenverhältnis documentclass{article}pagestyle{empty}begin{document}$ ({rm Na)/}sqrt {{rm (Ca + Mg) }} = 0) $end{document} des Sättigungsextraktes. Die Na-Q/I-Beziehung war bei jedem der untersuchten Böden im Bereich niedriger Ionenverhältnisse linear. Die Werte für - ΔNao (Extrapolation der Isothermen auf documentclass{article}pagestyle{empty}begin{document}$ ({rm Na)/}sqrt {{rm (Ca + Mg) }} = 0) $end{document} waren sehr hoch korreliert (r2 + 0.89) mit dem austauschbaren Na. Das Aktivitätenverhältnis der Gleichgewichtslösung war ähnlich dem im Sättigungsextrakt bei den nicht salzhaltigen Böden, jedoch wesentlich niedriger bei den Salzböden. Die Steigung der Na-Q/I-Beziehung schien ein Bodencharakteristikum zu sein, das weder durch Na-Entzug noch Na-Zugabe (bis 5 mval/100 g) beeinflußt wurde. Die PBCNa-Werte waren hoch korreliert mit der Austauschkapazität der Böden (r2 + 0,97)." @default.
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- W2048452011 date "1975-01-01" @default.
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- W2048452011 title "Sodium‐calcium and magnesium exchange equilibria in soils" @default.
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- W2048452011 doi "https://doi.org/10.1002/jpln.19751380603" @default.
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