Abstract
AbstractCation‐exchange capacities with KCl or NaNO3 in volcanic ash soils varied from 6 to 18 meq/100 g whereas CEC with KH2PO4 or NaH2PO4 varied from 78 to 188. Cation‐exchange capacities with NaH2PO4 and NaNO3 were 28 and 6, respectively, for an alfisol and 12 and 2, respectively, for an oxisol. The ratios of CEC with H2PO4‐ as compared to Cl‐ or NO3‐ varied from about 4 to 30. The effect of the H2PO4‐ is explained as a result of neutralization of positive charge in the soil with a simultaneous release of negative charge.
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