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sur le développement des zones arides et semi-arides

Titre : TAXONOMIC STUDIES ON SOILS OF THOTAPALLI AYACUT AREA OF NORTH COASTAL REGION OF ANDHRA PRADESH

Auteur : HIMABINDU, KOSTU

Université de soutenance : Acharya N G Ranga Agricultural University, Guntur

Grade : Master of Science in Agriculture 2018

Résumé partiel
Six soil profiles from Devarapalli, Gujjangivalasa, Cheepurupalli, Gangada, Aamity and Maddivalasa villages belonging to Srikakulam and Vizianagaram districts of north coastal Andhra Pradesh were selected and described for their site and morphological features. Horizonwise soil samples were collected from each profile and subjected to laboratory analysis. Surface soil samples were also collected from one hundred locations throughout the study area for fertility evaluation. Based on the morphology, physical, physico-chemical, electro-chemical and chemical properties of the soils, the soil profiles were classified as per USDA soil taxonomy (Soil Survey Staff, 2014). The study area was characterized as semi-arid to sub-humid climate with distinct wet and dry seasons. The profiles were derived from granite-gneiss and mixture of granite-gneiss with calcareous murram. Topography was gently sloping cultivated lands to nearly level cultivated plains. The soils were moderately deep to very deep. Surface cracks of deep and wide and intersecting slickensides were observed in Gangada and Maddivalasa profiles, while argillans and iron nodules were found in profiles of Devarapalli, Gujjangivalasa and Aamiti. Profile 1 and 2 developed argillic horizon and profile 3, 4 and 5 had cambic horizon and calcic horizon was noticed in deeper layers of profile 4. The colour of the soils varied from yellowish brown to dark grayish brown. In general the textural classes were sandy loam to sandy clay loam in red soils while, it was clay loam / clay in black and associated soils. The structure varied from granular to sub-angular blocky in surface horizon and subangular blocky to angular blocky in subsurface

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