Abstract Geo-referenced soil samples were collected from 15 sites in the Sharda Sahayak Canal Command of Uttar Pradesh falling in the Indo-Gangetic plain region and were analysed in laboratory for assessment of the nature and extent of sodicity. It was observed that in surface soil, the pH ranged from 7.58 to 10.73 and the pH generally decreased with soil depth. Soil EC varied from 0.48 to 12.89 dS/m with more than 50% samples having EC > 4 dS/m indicating the occurrence of salinity along with sodicity in the area. Soil organic C content was between 0.11% and 0.80% in surface soil that decreases with soil depth. Sodium content ranged from 7.304 to 716.52 meq/l in saturation extract and generally decreased with an increase in soil depth at all the sites indicating flushing of salts with canal water seepage. Potassium content also behaved similar to sodium having higher content in surface soil (0.25–18.37 meq/l) and decreased with depth at all the locations. Sentinel-2B remote sensing data was downloaded for May 2022 and May 2023 and pre-processed, analysed using an open source software Quantum GIS. Remote sensing images were classified mainly into five land uses and land covers (LULC): vegetation/plantation, fallow/bare land, water/water bodies, built-ups/sandy areas and sodic soils. Both supervised (MLC, SAM) and unsupervised (ISODATA) methods of classification were applied and the accuracy assessment of classified LULC image was done with the help of ground check points. The ISODATA method was found to be better than other methods for the assessment of waterlogged sodic soils, according to which area under sodic soils was 11,298.54 ha (3.05%) in Pratapgarh district, Uttar Pradesh, India, in May 2023. This approach for assessment of waterlogged sodic soils paves the way for strategizing the ameliorative interventions for ecological restoration of waterlogged sodic soils in canal commands. Research highlights <UnorderedList Mark="Bullet"> <ItemContent> Spectral signatures differentiate sodic soils from other land uses resulting in accurate mapping of these soils. </ItemContent> <ItemContent> Suitability of Sentinel-2 MSI data for identification of waterlogged sodic soils in canal command of Uttar Pradesh. </ItemContent> <ItemContent> Planning and management of sodic soils based on sodicity level and suggesting adoptable interventions. </ItemContent> </UnorderedList>

Assessment of waterlogged sodic soils using Sentinel-2 imageries for ecological restoration planning in Pratapgarh district, Uttar Pradesh, India

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发表日期：

2026年2月9日

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R H Rizvi,
Sanjay Arora,
C L Verma,
Maneesh Pandey

摘要

Abstract

Geo-referenced soil samples were collected from 15 sites in the Sharda Sahayak Canal Command of Uttar Pradesh falling in the Indo-Gangetic plain region and were analysed in laboratory for assessment of the nature and extent of sodicity. It was observed that in surface soil, the pH ranged from 7.58 to 10.73 and the pH generally decreased with soil depth. Soil EC varied from 0.48 to 12.89 dS/m with more than 50% samples having EC > 4 dS/m indicating the occurrence of salinity along with sodicity in the area. Soil organic C content was between 0.11% and 0.80% in surface soil that decreases with soil depth. Sodium content ranged from 7.304 to 716.52 meq/l in saturation extract and generally decreased with an increase in soil depth at all the sites indicating flushing of salts with canal water seepage. Potassium content also behaved similar to sodium having higher content in surface soil (0.25–18.37 meq/l) and decreased with depth at all the locations. Sentinel-2B remote sensing data was downloaded for May 2022 and May 2023 and pre-processed, analysed using an open source software Quantum GIS. Remote sensing images were classified mainly into five land uses and land covers (LULC): vegetation/plantation, fallow/bare land, water/water bodies, built-ups/sandy areas and sodic soils. Both supervised (MLC, SAM) and unsupervised (ISODATA) methods of classification were applied and the accuracy assessment of classified LULC image was done with the help of ground check points. The ISODATA method was found to be better than other methods for the assessment of waterlogged sodic soils, according to which area under sodic soils was 11,298.54 ha (3.05%) in Pratapgarh district, Uttar Pradesh, India, in May 2023. This approach for assessment of waterlogged sodic soils paves the way for strategizing the ameliorative interventions for ecological restoration of waterlogged sodic soils in canal commands.

Research highlights

Spectral signatures differentiate sodic soils from other land uses resulting in accurate mapping of these soils.

Suitability of Sentinel-2 MSI data for identification of waterlogged sodic soils in canal command of Uttar Pradesh.

Planning and management of sodic soils based on sodicity level and suggesting adoptable interventions.