Also check Duripan, Fragipan, Soil survey methods along with scale , Humic substances solubility (Humic acid, fulvic acid and humin), Reclamation methods for acid soils, saline soils and sodic (alkali) soils, pH, EC, ESP and SAR of saline, sodic and saline-sodic soils, Unit of thermal diffusivity, order of thermal conductivity, Unit of specific heat, specific heat of water and other materials.
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These all are most most important questions in Soil Science.
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Revised ARS Syllabus (2).pdf
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Revised ARS Syllabus (2).pdf