Soils of Thotapalli Major Irrigation Project of North-Coastal Andhra Pradesh: Characterization and Classification
2022
Himabindu, K. | Gurumurthy, P. | Prasad, P. R. K.
Six representative pedons from Devarapalli (P ), Gujjangivalasa (P ), Patikivalasa (P ), Gangada (P ), Aamiti (P ) and Maddivalasa (P ) villages belonging to ayacut of Thotapalli major irrigation project of North-Coastal Andhra Pradesh were studied. Pedons 1, 2 and 5 were developed from granite-gneiss, while pedons 3, 4 and 6 had their parent legacy with granite-gneiss mixed with calcareous murrum. The soils of P and P were moderately deep to very deep having argillic horizon while cambic sub-surface diagnostic horizon was noticed in P , P and P . Deep and wide surface cracks and slickensides close enough to intersect were observed in P4and P . The pedons P P P and P had sandy loam to sandy clay loam texure and it was clay loam to clay in cultivated plains (P and P ). The soils were low to medium in organic carbon content. The CEC ranged from 6.4 to 32.5 cmol -1(p+) kg and the soilexchange complex was dominated by calcium followed by magnesium, sodium and potassium. The ratio of CEC/ clay was low in P medium in P , P and P and high in P . Devararapalli pedon was classified as Typic Haplustalfs, Gujjangivalasa as Typic 4Haplustults, Patikivalasa and Amiti as Typic Haplustepts, Gangada as Vertic Haplustepts and Maddivalas as Chromic Haplusterts.
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