Effect of Combined Amendments on Improving Salinity, Sodicity, and Biological Indices of A Saline-Sodic Soil

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Piri Neda; Rezapour Salar; Barin Mohsen; Asadzadeh Farrokh; Asgarzadeh Hossein

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Journal Paper

Paper Information

Journal: APPLIED SOIL RESEARCH Year:2024 | Volume:12 | Issue:1 Page(s): 96-107

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Title

Effect of Combined Amendments on Improving Salinity, Sodicity, and Biological Indices of A Saline-Sodic Soil

Author(s)

Keywords

Soil ecosystem

Organic improvement

Biological indicators

Saline-sodic soil

Soil carbon

Abstract

The present study was conducted to investigate the impact of organic (vermicompost and biochar) and chemical (gypsum and elemental sulfur) amendments and combination of vermicompost and chemical treatments on salinity, sodicity, and biological characteristics of a saline-sodic soil. This study was performed as factorial with two factors (with and without microbial inoculation) based on a completely randomized design with three replications in greenhouse conditions. After mixing with different treatments, soil samples were kept in the field capacity for 120 days, and wheat was cultured for 150 days following leaching soil samples. The most important chemical and biological properties of all soils were determined after harvesting the wheat plants. The results showed that the effect of each of the main factors of chemical and organic treatments including microbial inoculation and without microbial inoculation significantly (at the level of 5, and 1%, respectively) decreased the pH, EC, and ESP, the interactions of the factors did not have a significant impact on reducing them. For both factors, the role of combined treatments in improving the above indices was significantly greater than individual treatments. The main effect of experimental factors significantly affected (p <0.01) most biological indicators including basal respiration, substrate induced respiration, and soil microbial biomass carbon. However, the interactions of the factors significantly affected only microbial biomass carbon (p <0.05). Among all the treatments of both factors, the combined treatment of vermicompost and gypsum had the greatest effect on all three soil biological indices. This suggests that this treatment may have improved the soil ecosystem to increase and improve the activities of microorganisms by better improving soil chemical conditions than other treatments (such as reducing soil salinity and pH), and providing a substrate with more degradable carbon storage.

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