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Analysis of Irrigated Salt-Affected Soils in the Central Fergana Valley, Uzbekistan, Using Landsat 8 and Sentinel-2 Satellite Images, Laboratory Studies, and Spectral Index-Based Approaches

  • DEGRADATION, REHABILITATION, AND CONSERVATION OF SOILS
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Abstract

Soil salinity is a fundamental barrier to soil fertility, particularly in dry climates, and is a limiting factor for agricultural output and subterranean water utilization. Soil salinity significantly restricts agricultural soils in Uzbekistan. Remote sensing and satellite images were used to evaluate soil salinity in the Mingbulak District of Uzbekistan. In October 2019, soil samples were taken from various locations and analyzed, and soil salinity indices were calculated. The region’s soil salinity was then mapped and modeled. The results revealed that SI 12 and the NDSI from Landsat 8 were superior to the others. The accuracy of the single band B2 and that of salinity indices SI1 and SI8 of Landsat 8 and Sentinel-2A were higher in the deeper layers than in the upper. NDSI was used to model the relationship between soil salinity (electrical conductivity) and the prominent salt ion \({\text{SO}}_{4}^{{2 - }}.\) The model was validated successfully, and a soil salinity map was created. According to the findings, the NDSI provided more accurate information on soil salinity than the other salinity indices, and the blue band was successful in depicting sublayers and the overall salinity of the region.

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ACKNOWLEDGMENTS

The author’s team wishes to thank the USAID Regional Water and Environment Project for technical and financial assistance in the framework of the Young Scientists Competition. Author Lakshmi Gopakumar, Tomoaki Yamaguchi, Megumi Yamashita, and Keisuke Katsura declare they have no financial interests.

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Authors and Affiliations

  1. Graduate School of Agriculture, Tokyo University of Agriculture and Technology, 183-8538, Tokyo, Japan

    Sh. Kholdorov, M. Yamashita & K. Katsura

  2. Department of Soil science, National University of Uzbekistan named after Mirzo Ulugbek, 100174, Tashkent, Uzbekistan

    Sh. Kholdorov & Z. Jabbarov

  3. School of Environmental Studies, Cochin University of Science and Technology, 682022, Kochi, India

    G. Lakshmi

  4. Sacred Heart College, 682013, Kochi, India

    G. Lakshmi

  5. United Graduate School of Agricultural Science, Tokyo University of Agriculture and Technology, 183-8538, Tokyo, Japan

    T. Yamaguchi

  6. “Soil composition and repository, quality analysis center” SUE, under the Ministry of Agriculture of the Republic of Uzbekistan, 100097, Tashkent, Uzbekistan

    N. Samatov

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  1. Sh. Kholdorov
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  2. G. Lakshmi
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Correspondence to K. Katsura.

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Kholdorov, S., Lakshmi, G., Jabbarov, Z. et al. Analysis of Irrigated Salt-Affected Soils in the Central Fergana Valley, Uzbekistan, Using Landsat 8 and Sentinel-2 Satellite Images, Laboratory Studies, and Spectral Index-Based Approaches. Eurasian Soil Sc. 56, 1178–1189 (2023). https://doi.org/10.1134/S1064229323600185

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