S. R. BALANAGOUDARLOHIT2020-07-042020-07-042018-10-30150http://krishikosh.egranth.ac.in/handle/1/5810148552Assessment of salt affected soils of Upper Krishna Project command area under Lingasuguru taluk using Remote Sensing and Geographical Information System was carried out during April- May, 2017. The mean pHe at all depths in both the soils were in the category of mildly alkaline. The mean EC and ECe values were <4.0 dS m-1 at all the depths in both the soils were non-saline. Sodium ion (Na+) was the dominant cation followed by (Ca2++Mg2+) and K+. Sulphate (SO42-) was the dominant anion followed by HCO3- and Cl- in both black and red soils. Generally both cations and anions not showed any increasing or decreasing trend with depth. However, 7.6 % samples in black soil and 8.33 % in red soils were having pHe > 8.5 and 23.07 % samples in black soils and 8.33 % samples in red soils were having ECe > 4 dS m-1 in surface samples only, reflecting that the soils were sodic and saline to that extent in the study area. The mean Na+/ (Cl-+SO42-) ratio was >1 at all depths and varied from 2.31, 2.27 to 2.58 and 1.94 to 2.01 for both black and red soils, respectively. The per cent distribution of samples for SAR ranged from 11.11 (30-90 cm) to 15.38 (15-30 cm) for black soil samples which were >13 indicating the sodic nature of soil. In both black and red soils of study area sodium adsorption ratio (SAR) had significant and negative correlation with (CO32-+HCO3-)/ (Cl-+SO42-) (r = -0.790** and -0.749**) at both 0-15 and 15-30 cm depths of black soils, respectively but in red soils significant and positive correlation with Na+/ (Cl-+SO42-) (r = 0.910** and 0.918**) at both 0-15 and 15-30 cm depth was observed.ennullThesis