Effects of Water Quality on Trend of Desodification of Heavy Soils by Continuous Leaching

Document Type : Research Paper


1 PhD Candidate, Department of Irrigation and drainage, Shahid Chamran University of Ahwaz

2 Professor, Department of Irrigation and drainage, Shahid Chamran University of Ahwaz, Iran

3 Associate Professor, Department of Irrigation and drainage, Shahid Chamran University of Ahwaz

4 Scientific Staff Member, Agricultural Engineering Research Institute (AERI), Karaj, Iran


Huge amounts of drainage water are disposed from operating irrigation and drainage
networks in Khuzestan, SW Iran, that need to be managed and/or reused. One of the low
risk methods of reusing drainage water is to reuse it in land reclamation. To investigate
the effects of water quality on desodification of clay soils of this area, leaching
experiments were done in 1.5×1.5 meter plots in “Salman Farsi” sugarcane agro industry,
South Khuzestan. Leaching with three different water qualities; 2.61 dS/m (fresh water
from Karun River), 6.0 and 9.0 dS/m (a mixture of agro industry drainage water and
Karun River water) in three treatments; T1, T2 and T3 respectively, and six replications
ad based on a completely randomized blocks design were experimented. Rate of
desodification was decreased with increase in leaching water salinity. Using drainwater
with salinity of 6.0 dS/m led to increasing dissolved Ca++ and Mg++ in soil following
leaching. The SAR, in 0-30 cm soil layer that was initially 84 (meq/lit)1/2, following
application of treatments T1, T2 and T3 decreased to 9, 10 and 18 (meq/lit)1/2
respectively. So the sodicity problem was partly solved through leaching by drainage
water with salinity of 6.0 dS/m, excluding the need for use of fresh water. The soil pH
was not in the basic range either before or following leaching.


Main Subjects

Abdel-Khalek, M. A., El Gamal, F., El Kady, M., and Hamdy, A. (2003). Agricultural drainage water reuse options, potential, costs and guidelines. In: Hamdy A. (ed.). Regional Action Program (RAP): Water resources management and water saving in irrigated agriculture (WASIA PROJECT). Bari: CIHEAM, 137 -162.
Abrol, I. P., Chhabra, R., and Gupta, R. K. (1980). A Fresh Look at the Diagnostic Criteria for Sodic Soils. International Symposium on Salt Affected Soils. Central Soil Salinity Research Institute, Karnal. February 18-21, 1980. 142-147.
Barzegar, A. R. (2008). Salt-affected Soils: Diagnosis and Productivity. (2nd Ed) Shahid Chamran University of Ahwaz, Iran. (In Farsi).
Barzegar, A. R., Amirian, A. R., and Naseri, A. A. (2007). Study of Leaching Limiting Factors in Sugarcane Fields (South of Ahwaz). Journal of Agricultural Sciences and Natural Recourses.14 (1). (In Farsi)
Chi, C. M., Zhao, C. W., Sun, X. J., and Wang, Z. C. (2012). Reclamation of saline-sodic soil properties and improvement of rice (Oriza sativa L.) growth and yield using desulfurized gypsum in the west of Songnen Plain, northeast China. Geoderma, 187–188 (2012) 24–30.
Foth, H. D. (1990) Fundamentals of Soil Science. John Wiley& Sons. USA.
Gharaibeh, M. A., Eltaif, N. I., and Shra’a, S. H. (2012). Desalination and Desodification Curves of Highly Saline-Sodic Soil Amended with Phosphoric Acid and by-Product Gypsum. International Journal of Environmental Science and Development, 3(1), 39-42.
Mahler, P. (1979). Manual of Land Classification for Irrigation. (3nd Ed) Soil and Water Research Institute of Iran. Pub. No. 205.
Naseri, A. A. (1998). The Hydraulic Conductivity of Aggregated Clay Soils Under Loading, Leaching and Reclamation. PhD Thesis, University of Southampton, U. K.
Rhoades, J. D., Kandidah, A. K., and Mashali, A. M. (1992). The Use of Saline Water for Crop Production. FAO. Irrigation and Drainage Paper No.46.
San Joaquin Valley Drainage Implementation Program (1999). Drainage Reuse Technical Committee Report. Sacramento, United States of America, Department of Water Resources. 81 pp.
Sarraf, A., Vahdat, F., Pazira, E., and Sedghi, H. (2010). Estimating Reclamation Water Requirement and Predicting Final Soil Salinity for Soil Desalinization. XVIIth World Congress of the International Commission of Agricultural and Biosystems Engineering. Québec City, Canada, June 13-17, 2010.
Tanji, K. K. and Kielen, N. C. (2003). Agricultural Drainage Water Management in Arid and Semi-Arid Areas. FAO Irrigation and Drainage Paper 61. Food and Agriculture Organization of the United Nations. Rome.
United Nations Development Program (2007). Human Development Report 2006 – Beyond Scarcity: Power, Poverty and the Global Water Crisis. United Nations Development Program, New York.