Redistribution of Exchangeable Cations in a Saline-Sodic Soil Due to the Application of Different Amendments

Document Type : Research Paper

Authors

1 Assistant Professor, Department of Water Engineering, Islamic Azad University, Kerman Branch

2 Professor, Department of Soil Sciences, Islamic Azad University, Science and Research Branch, Tehran

3 Assistant Professor, Department of Soil Sciences, Agriculture Faculty, Shahid Bahonar University of Kerman

4 Assistant Professor, Agriculture and Natural Resources Research Centre, Kerman

Abstract

Soil salinity and sodicity are important aspects of land degradation, especially in arid and semi-arid regions. This study focused on the effect of different organic and inorganic amendments on saline-sodic soil amelioration with emphasis on the redistribution of exchangeable cations. The experiment was performed as factorial based on complete randomized design using 6 soil treatments including: control, cattle manure, pistachio residue, gypsum, cattle manure+ gypsum, and pistachio residue+ gypsum. Besides, there were two irrigation water treatments: with and without sulfuric acid. All treatments were applied in 3 replicates and the study was conducted in laboratory conditions using soil column. Four intermittent irrigations events with one month intervals and one pore volume per event were applied. The results showed that application of the soil amendments had significant effect on the concentration of exchangeable cations as well as Exchangeable Sodium Percentage (ESP), while addition of sulfuric acid showed no significant influence on bivalent cations. At the end of amelioration process, the lowest amounts of monovalent cations and the ESP were found in the surface layer increasing with soil depth, whereas no significant changes were observed for the bivalent cations. The exchangeable sodium increased in all the applied treatments, except pistachio residue (with and without sulfuric acid) and pistachio residue+ gypsum, which resulted in some decreases. All treatments, especially pistachio residue, increased exchangeable potassium. Cattle manure was the only amendment that decreased exchangeable calcium compared to the control. The application of gypsum in comparison to the control showed the highest effect on increasing exchangeable calcium and magnesium, however, in the presence of sulfuric acid, it decreased in some treatments. The results indicated that, in the presence of sulfuric acid, pistachio residue and gypsum treatments had the highest influence on decreasing ESP, but in the absence of sulfuric acid, pistachio residue alone or in combination with gypsum was the most effective treatment in decreasing ESP. Also, since the soil was calcareous, sulfuric acid exhibited more efficiency than gypsum in decreasing ESP. Finally, the findings of this research highlight the importance of pistachio residue in ameliorating calcareous saline-sodic soils.

Keywords

References

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Iranian Journal of Soil Research
Volume 27, Issue 2
September 2013
Pages 179-193

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