Empirical equations for prediction of major cation concentrations in soil solution using concentrations in water extracts

Shin-Ichiro Wada, Koji Odahara, Noriaki Gunjikake, Shiro Takada

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Soil solution composition is one of the most important factors governing the uptake of nutrients by plants. However, sampling soil solution is usually time and labor consuming. We analyzed soil solutions and water extracts from 126 soil samples including 41 allophanic Andisols for major cations and anions. The multiplication of the concentration of a cation in the water extract by the dilution ratio (i.e. the ratio of the water content at water extraction to that at soil solution separation) always overestimated its concentration in soil solution. For soils in which the soil solutions were unsaturated with respect to gypsum, there were highly significant linear correlations between the concentration in soil solution and the concentration in water extract multiplied by the dilution ratio for Ca, Mg, K and Na. The linear regression analyses gave the following equations for predicting cation concentration in soil solution: [Ca]ss = 0.8553 rd [Ca]wex - 0.9282, [Mg] ss = 0.9346 rd [Mg]wex - 0.6645, [K] ss = 0.4978 rd [K]wex - 0.8984, [Na] ss = 0.7092 rd [Na]wex - 0.5283, where [ ] refers to the concentration in mmol L-1, the subscripts ss and wex are soil solution and water extract, respectively, and rd is the dilution ratio. We also proposed a practical criterion to evaluate the saturation status of soil solution with respect to gypsum.

Original languageEnglish
Pages (from-to)257-263
Number of pages7
JournalSoil Science and Plant Nutrition
Volume52
Issue number3
DOIs
Publication statusPublished - Jun 1 2006

Fingerprint

soil solution
cations
cation
prediction
extracts
soil
water
gypsum
dilution
soil water
Andisols
Andisol
anions
nutrient uptake
labor
soil sampling
anion
water content
saturation

All Science Journal Classification (ASJC) codes

  • Soil Science
  • Plant Science

Cite this

Empirical equations for prediction of major cation concentrations in soil solution using concentrations in water extracts. / Wada, Shin-Ichiro; Odahara, Koji; Gunjikake, Noriaki; Takada, Shiro.

In: Soil Science and Plant Nutrition, Vol. 52, No. 3, 01.06.2006, p. 257-263.

Research output: Contribution to journalArticle

Wada, Shin-Ichiro ; Odahara, Koji ; Gunjikake, Noriaki ; Takada, Shiro. / Empirical equations for prediction of major cation concentrations in soil solution using concentrations in water extracts. In: Soil Science and Plant Nutrition. 2006 ; Vol. 52, No. 3. pp. 257-263.
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