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...Acharya n g ranga agricultural university college bapatla contents preface soil science agriculture agronomy genetics and plant breeding bio technology economics engineering horticulture chemistry microbiology physiology practice papers i introduction the term is derived from latin word solum means floor or ground interphase between atmosphere mantle of rocks making up earth s crust called lithosphere regolith all loose material above bedrock unconsolidated weathered rock survey systematic examination description classification soils pedology dealing with genesis laws geographic distribution as a body in nature edaphology it study stand point higher plants are defined aggregates one more minerals eg limestone aggregation calcite mineral have no definite chemical morphological composition symmetrical form like based on origin classified igneous sedimentory metamorphic these most abundant makeup oldest also known crystalline massive fire mainly consist primary than half containing feldsp...