Spatial and Temporal Analysis of Sodic Soils in Sharda Sahayak Canal Command of Amethi District using Sentinel-2A/2B MSI Data: Spatial and temporal analysis of sodic soils
2024
Rizvi, Raza Haider | Arora, SANJAY | Verma, CHHEDI LAL | Dubey, ANIL KUMAR | Yadav, RAJENDER KUMAR
In Sharda Canal Command of Uttar Pradesh, about 2,60,000 ha area is waterlogged and 2,53,300 ha area is salt affected. Therefore, this command area having problems of waterlogging and salinity needs to be properly and regularly monitored for site-specific reclamation and managment. Geospatial technologies have potential to analyse spatially and temporally a geographical area say district for desired feature. 48 soil samples at 12 locations and four depths with their GPS locations were collected from Sharda Canal Command in Amethi district. These samples were analyzed in laboratory for different soil parameters like pH2, EC2, OC, Na, K, pHe, ECe, etc. Most of the soil samples have pH more than 10 indicating that soils in the Sharda Command is highly sodic. Soil EC varied from 1.55 to 13.32 dS/m at 0-15 cm depth and ESP of the samples ranged from 81-93%. Soil pH2 and EC2 varied from 10.13 to 10.67 and dS/m, respectively at 15-30 cm depth. Organic carbon varied from 0.20 to 0.43% at 0-15 cm depth and from 0.11 to 0.40% at 15-30 cm depth. Sentinel-2A/2B MSI remote sensing images (spatial resolution 10-20m) for pre-monsoon period (May 2022 & May 2023) were downloaded and pre-processed. Land use land cover (LULC) analysis for Amethi district was done using an open source software QGIS (v. 3.24.0). Unsupervised classification method (ISODATA) was applied on district’s images and the output image was reclassified for five LULC classes mainly water/water bodies, built-ups/sandy areas, vegetation/plantation, bare/fallow land and sodic soils. Area under plantation/vegetation and bare/fallow land accounted for more than 27 percent in both the years. Estimated area under sodic soils increased from 5.50 percent in May 2022 to 6.39 percent in May 2023 in Amethi district.
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