Assessment of Salinity Level and Some Nutrients in Different Depths of Soil at Kalapara Upazila of..

Salinity intrusion is a big environmental problem all over the world. At Kalapara Upazila in Bangladesh's Patuakhali district, the spatial variability of salt accumulation through the soil profile was investigated. Soil samples were taken from 30 locations in six villages in Kalapara Upazila, Patuakhali district: Solimpur, Umidpur, Diaramkhola, Hazipur, Monoharpur, and Puranmohipur. Soil samples were taken from two soil depths at each location (0-5cm and 5-10 cm). As a result, the analysis included 60 soil samples from 30 locations and two soil depths. The soils were acidic, with mean pH values of 4.11 and 4.83 in the 0-5, and 5-10 cm depths, respectively. The EC1:5 values were 5.80 dS/m in the 0-5 cm soil depth. In 5-10 cm soil depth, the EC1:5 values were significantly reduced to 1.86dS/m. The available P content was 21.3 and 24.1 ppm in the 0-5 and 5- 10 cm soil depths, respectively, suggesting that P is less available in the surface soil. The available sulphur content was 28.5 meq/100 g soil ppm in the 0-5 cm soil depth, but it was decreased by 63 percent in the 5-10 cm soil depth.

Surface soil had a Na+ content of 23.03 meq/100 g soils, while subsurface soil had a Na+ content of 16.7 meq/100 g soils, indicating that Na affects plant growth in the study region.The amount of exchangeable K in the soil decreased as the depth of the soil increased. Salinity was found to be severely affecting Monoharpur, Puranmohipur, and Diaramkhola villages based on electrical conductivity and different nutrients.

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