Journal of Food, Agriculture and Environment
Vol 12,
Issue 2,2014
Online ISSN: 1459-0263
Print ISSN: 1459-0255
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Estimating osmotic potential from electrical conductivity for solutions/extracts in salt-affected soils using an universal equation
Author(s):
Xu Liu,
Chunming Chi *Recieved Date: 2014-02-26, Accepted Date: 2014-03-30
Abstract:Crops in saline soils are stressed by osmotic potential (OP) of soil solutions. The relationship between OP and electrical conductivity (EC) in soil solutions (ECs) is useful because the measurement of EC is in general use and can be more readily measured than OP in soil solutions or extracts. The EC measured is roughly related to the total electrolyte concentration (TEC) for solutions or extracts by the following equation: TEC (mmolc·L–1) ≈ 10×EC (dS·m–1). Combining this equation and the Van’t Hoff Equation of OP (kPa) = -R×T×i×TEC (mol L–1) gives an universal equation of OP (kPa) ≈ –R×T×i×10×EC×10–3. Substitution of R = 0.0083 kPa·L·K-1·mol–1, i = 2 and T = 298K (25°C) into this equation to make the approximation provides a simple representative and universal form of OP as OP (kPa) ≈ –50×EC (dS·m–1). An independent validation set of 50 soils showed that predicted OP equivalents were not significantly different than direct OP measurements suggesting that the equation of OP (kPa) ≈ –50×EC (dS·m–1) can be regarded as an universal equation to estimate OP from EC for solutions or extracts of salt-affected soils.
Keywords:OP,
EC, an universal equationJournal: Journal of Food, Agriculture and Environment
Year: 2014
Volume: 12
Issue: 2
Category: Environment
Pages: 1033-1035
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