Indirect Measurement of Electrical Conductivity and Exchangeable Cations on Soil Water Extracts: Assessing the Precision of the Estimates. Issue 9 (September 2016)

• Record Type: Journal Article
• Authors: Monteleone, Massimo; Lacolla, Giovanni; Caranfa, Gianraffaele; Cucci, Giovanna
• Is Part Of: Soil science. Volume 181:Issue 9/10(2016)
• Publication Date: 2016-09
• Subjects: soil particle size -- electrical conductivity -- saturation extract -- soil/water dilution ratios -- sodium hazard; Soil science -- Periodicals; 631.405
• DOI: 10.1097/SS.0000000000000181
• Languages: English
• ISSNs: 0038-075X

Abstract

Abstract : Abstract: The electrical conductivity of saturated soil paste extracts with respect to the electrical conductivity of extracts obtained applying different soil-water dilution ratios (from 1:1 to 1:5) was estimated considering 194 soil samples of different texture, salinity, and pH. A smaller data set composed by 50 samples was used to estimate exchangeable sodium percentage (ESP) values from the concentration of soluble cations determined on 1:2 water extracts. Both estimation procedures were carried out applying a linear multivariate model, according to a "stepwise" approach. The dilution ratio 1:2 provided the best estimates, although all the dilution ratios gave reasonable results. The ESP prediction model included the concentration of soluble sodium; the addition of electrical conductivity and pH values of the 1:2 soil-water extracts improved precision.