Abstract
In this study, the reclamation of a calcareous sodic soil with the exchangeable sodium percentage (ESP) value of 26.6 % was investigated using the cheap and readily available chemical and organic materials including natural bentonite and zeolite saturated with calcium (Ca2+), waste calcite, three metal oxide nanoparticles functionalized with an acidic extract of potato residues, and potato residues. Chemical amendments were added to the soil at a rate of 2 %, while potato residues were applied at the rates of 2 and 4 % by weight. The ESP in the amended soils was reduced in the range of 0.9–4.9 % compared to the control soil, and the smallest and the largest decline was respectively observed in treatments containing waste calcite and 4 % of potato residues. Despite the reduction in ESP, the values of this parameter were not below 15 % at the end of a 40-day incubation period. So, the effect of solutions of varying sodium adsorption ratio (SAR) values of 0, 5, 10, 20, 30, 40, and 50 on sodium (Na+) exchange equilibria was evaluated in batch systems. The empirical models (simple linear, Temkin, and Dubinin-Radushkevich) fitted well to experimental data. The relations of quantity to intensity (Q/I) revealed that the potential buffering capacity for Na+ (PBCNa) varied from 0.275 to 0.337 ((cmolc kg−1) (mmol L−1)−1/2) in the control soil and amended soils. The relationship between exchangeable sodium ratio (ESR) and SAR was individually determined for the control soil and amended soils. The values of Gapon selectivity coefficient (K G) of Na+ differed from the value suggested by U.S. Salinity Laboratory (USSL). The PHREEQC, a geochemical computer program, was applied to simulate Na+ exchange isotherms by using the mechanistic cation exchange model (CEM) along with Gaines-Thomas selectivity coefficients. The simulation results indicated that Na+ exchange isotherms and Q/I and ESR-SAR relations were influenced by the type of counter anions. The values of K G increased in the presence of bicarbonate, sulfate, and phosphate in comparison with the presence of chloride, and the largest value was obtained in the presence of phosphate. So, it can be concluded that the presence of chloride anion is more favorable to reduce ESP compared to other anions, while the presence of phosphate anion makes the reclamation process more difficult. Furthermore, it is possible to reclaim sodic soils using inexpensive and readily available compounds such as potato residues and water management.
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Ranjbar, F., Jalali, M. The effect of chemical and organic amendments on sodium exchange equilibria in a calcareous sodic soil. Environ Monit Assess 187, 683 (2015). https://doi.org/10.1007/s10661-015-4894-7
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DOI: https://doi.org/10.1007/s10661-015-4894-7