MORPHOLOGY AND TAXONOMY OF RED AND BLACK SOILS OF EDLAPADU MANDAL OF GUNTUR DISTRICT, ANDHRA PRADESH

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dc.contributor.advisorSESHAGIRI RAO, M
dc.contributor.authorRADHA KRISHNA, J
dc.date.accessioned2016-08-04T13:44:18Z
dc.date.available2016-08-04T13:44:18Z
dc.date.issued2007
dc.description.abstractEight profiles from Turlapadu, Jaggapuram, Edlapadu, Solasa, Kondaveedu, Changeej Khan Peta, Boyapalem and Timmapuram villages of Edlapadu mandal of Guntur district, Andhra Pradesh were studied. Four were red soil profiles and other four were from black soil areas. Soil samples from each horizon were described in the field and characterized in the laboratory. Surface soil samples were also collected from sixty locations throughout the madnal for fertility evaluation. Based on the morphology, physical, physicochemical, electro-chemical and chemical properties of the soils, the soil profiles were classified as per USDA soil taxonomy. The study area was confined to semi-arid cliamte with well-defined dry and wet periods. The red soils were formed and developed on weathered granite-gneiss at higher elements of topography whereas, the black soils were occurring on granitic gneiss parent material mixed with calcareous murram relatively at lower elements of topography. The red soil profiles were relatively more weathered than black soil profiles. The colour varied from gray to very dark gray in black soil profiles and reddish brown to dark reddish brown in red soil profiles. The texture was loam to clay loam and clay loam to clay in red and black soil profiles, respectively. The structure of black soil profiles was mostly granular in surface, sub-angular or angular blocky in lower layers in red and black soil profiles. Granulometric data indicated that the black soils had lower and higher percent of sand and clay content, respectively than red soils. The ratios of different fine earth fractions revealed, absence of lithological discontinuity among the adjacent horizons in red and black soil profiles. The black soils had recorded higher water holding capacity, volume expansion and sticky point than the red soils. The CEC, base saturation, saturation of bases (calcium, magnesium, sodium and potassium) and CEC/clay ratios were higher in black soil profiles compared to red soil profiles. The results of physico-chemical properties revealed that the red soils were neutral to slightly alkaline in reaction. The soils were non-saline and noncalcareous. The black soils were slightly alkaline to strongly alkaline, nonsaline and slightly to moderately calcareous in nature. The chemical composition of soil samples exhibited the siliceous nature of the soils by the broad and large silica/sesquioxides and silica/alumina ratios. These molar ratios were relatively narrower in black soils than in red soils. While the alumina/iron oxides ratios were higher in black soil profiles than in red soil profiles. The soils of the mandal were low in organic carbon, low in available nitrogen, medium in available phosphorus, high in available potassium, sufficient in available sulphur and micronutrients except zinc, which was deficient in both red and black soils. From X-RDA, it was clear that black soil clays were dominated by montmorillonite, with small quanities of illite and kaolinite, while red soil clays had illite, kaolinite and montmorillonite type of clay minerals. Small amount of quartz was also recorded in clays of certain soil profiles. Black soil profiles were having the moderate limitations of soil (restricted drainage, fine texture and vertic features) besides the influence of semi-arid climate. Red soil profiles were formed on higer elements of topography having slight to moderate limitation of erosion and semiarid climate. Hene, the black soil profiles were grouped under IIIsc land capability sub-class and red soil profiles were grouped under land capability sub-class IIIec. The taxonomic units of the eight soil profiles were as following. Black soils: Profile 1: Very - fine, montmorillonitic, isohyperthermic, Chromic Haplustert Profile 2: Fine, montmorillonitic, isohyperthermic, Typic Haplustept Profile 4: Very - fine, montmorillonitic, isohyperthermic, Typic Haplustert Profile 8: Fine, montmorillonitic, isohyperthermic, Leptic Haplustert Red soils: Profile 3: Loamy, mixed, isohyperthermic, Typic Haplustalf Profile 5: Loamy, mixed, isohyperthermic, Typic Haplustept Profile 6: Loamy, mixed, isohyperthermic, Typic Haplustept Profile 7: Loamy, illitic, isohyperthermic, Typic Haplustalfen_US
dc.identifier.urihttp://krishikosh.egranth.ac.in/handle/1/70854
dc.language.isoenen_US
dc.publisherACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY, RAJENDRANAGAR, HYDERABADen_US
dc.relation.ispartofseriesD8235;
dc.subSoil Science and Agricultural Chemistry
dc.subjectMORPHOLOGY, TAXONOMY, RED, BLACK, SOILS, EDLAPADU, MANDAL, GUNTUR DISTRICT, ANDHRA PRADESHen_US
dc.these.typeM.Sc
dc.titleMORPHOLOGY AND TAXONOMY OF RED AND BLACK SOILS OF EDLAPADU MANDAL OF GUNTUR DISTRICT, ANDHRA PRADESHen_US
dc.typeThesisen_US
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