Browse > Article

Estimation of Conversion Factors for Electrical Conductivities Measured by Saturation-Paste and 1:5 Water Extraction  

Lee, Seung-Heon (Rural Research Institute, Korea Agricultural and Rural Infrastructure Corporation)
Hong, Byeong-Deok (Rural Research Institute, Korea Agricultural and Rural Infrastructure Corporation)
An, Yeul (Rural Research Institute, Korea Agricultural and Rural Infrastructure Corporation)
Ro, Hee-Myong (School of Agricultural Biotechnology, College of Agriculture and Life Sciences, Seoul National University)
Publication Information
Korean Journal of Soil Science and Fertilizer / v.36, no.4, 2003 , pp. 193-199 More about this Journal
Abstract
Electrical conductivity (EC) is a major indicator of soil salinity. Measurement of EC in saturation-paste extract of soil (ECe) is a standard way to evaluate soil salinity. However, many of the data on soil salinity have been obtained by measuring the EC of 1:5 soil-water extract (EC1:5) or salt percentage which is calculated from EC1:5 by multiplying a conversion factor. We analyzed 90 soil samples collected from 9 reclaimed tidelands in Korea, and derived relationships between ECe and dilution factors (DF1:5) which can convert EC1:5 to ECe in 2 soil textural groups at 5 salinity levels. Regression equations between ECe and DF1:5 were DF1:5 = 1.3624In(ECe) + 5.1386($r^2=0.37^{***}$) for soils of more than 50% silt content, DF1:5 = 1.9505In(ECe) + 5.3679($r^2=0.66^{***}$) for soils of less than 50% silt content. And the relationship for all soils investigated was DF1:5 = 1.4001In(ECe) + 5.4865($r^2=0.51^{***}$). From the relationships, conversion factors for calculation of ECe from EC1:5 of salt percentage data were estimated for soils of different textures and salinity levels.
Keywords
Electrical conductivity; Reclaimed tidelands; Saturation-paste extract; Soil salinity;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Jung, Y.S., J.H. Joo, S.D. Hong, I.B. Lee, and H.M. Ro. 2001. Discussion on dilution factor for electrical conductivity measured by saturation-paste extract and 1:5 soil to water extract, and CEC of Korean soils. Korean J Soil Sci.Fert. 34:71-75
2 National Institute of Agricultural Science and Technology. 2000. Methods of soil and plant analysis. Sammi Press, Suwon. Korea
3 Sumner. M.E., P. Rengasamy and R. Naidu. 1998. Sodic soils: A reappraisal, p. 3-17. In M. E. Sumner and R. Naidu (ed). Sodic soils. Oxford University Press, New York, USA
4 Jung, Y.S., S.H. Cho, J.E. Yang. J.J. Kim. and H.S. Lim. 2000. Avaliable phosphorus and Electhcal conductivity of the saturated extracts of soils from the plastic film houses. Korean J. Soil Sci. Fert. 33:1-7
5 Park, S.H. 2001. Tideland reclamation, p. 116-117. In S. K. Kwun (ed). Rice culture in asia. KCID, Ansan, Korea
6 Blakemore, L.C., P.L. Searle, and B.K. Daly. 1987. Method for chemical analysis of soils. NZ Soil Bureau Scientific Report 80. p. 77-79. NZ Soil Bureau. Department of Scientific and Industrial Research. Lowert Hutt, New Zealand
7 Lee, S.M., and S.H. Yoo, 2001. Estimating electrical conductivity of the saturation extract from 1:5 soil extract in reclaimed soil of the tideland. J. Korean Soc. Aghc. Chem. Biotechnol. 44:206-207
8 USSL Staff. 1954. Diagnosis and improvement of saline and alkali soils. USDA. Agri. Handbook No. 60. p. 1-9. Washington. D.C., USA
9 Rural Development Corporation. 1998. A study on the crop cultivation by the improvement of desalinization techniques on the reclaimed farmland, p. 6. Research Report 98-5-27. RDC, Ansan, Korea