The nature of soil buffer action
1931
Baver, L.D.
The following conclusions have been obtained from an analysis and discussion of the different factors affecting the nature of soil buffer action: The buffering of soils containing different amounts of the same type of colloid increases with the colloid content. Soils containing the same amount of colloid max, have different buffering properties due to variations in the nature of the colloid. Buffering due to organic matter takes place only in slightly acid, neutral, or alkaline reactions. Extraction of soluble Al2O3, Fe2O3, and SiO2 did not materially affect the buffering of soil colloids. Applications of phosphate equivalent to 3, 5, and 10 tons of superphosphate (16% P2O5) per acre did not impart buffering properties to the soil. The nature of soil buffer action is considered solely, a function of the nature of the colloidal acids in the soil and primarily dependent upon the inorganic colloidal clay acids. Organic colloidal acids are responsible for buffer action above the neutral point. Buffering is due to equilibria between these colloidal acids and their salts as affected by hydrolysis, dissociation, and solubility phenomena. The total buffer capacity of soils is determined by the equation: (...). This equation gives the buffering at various pH values as well as the total buffer capacity.
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