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Topics: Soil, rock weathering, soil formation, soil profile, soil classification, soil taxonomy, entisols, inceptisols, andisols, gelisols, histosols, Soil Architecture, soil color, soil texture, soil textural classes, mineral soils structure, tillage, soil density, soil water, soil water energy, soil water content, soil water potential, infiltration, percolation, water vapor movement, hydrologic cycle, soil-plant-atmosphere continuum, enhancing soil drainage, septic tank drain fields, soil aeration, redox potential, wetlands, soil temperature control, soil colloids, layer silicate clay structure, cation exchange capacity, soil acidity, soil ecology, soil organism, earthworms, ants, termites, soil algae, soil fungi, soil prokaryotes, soil organic, soil organic matter management, climate change, soil phosphorus, sulfur oxidation, sulfur retention, soil fertility maintenance, phosphorus cycle, ammonia volatilization, ammonia fixation, sulfur cycle, calcium, magnesium, silicon, trace elements, Practical Nutrient Management, chemical pollution, Geographic Soils Information

Topics: soil science, soil habitat, soil mineral components, soil organisms, soil organic matter, soil structure, soil micromorphology, soil porosity, soil-forming factors, climate, hydrologic cycle, soil temperature, evaporation, cation exchange, Anion adsorption, Clay–organic matter interactions, soil aeration, soil respiration, soil profile, Hydromorphic soils, Salt-affected soils, nutrient cycling, phosphorus, sulphur, potassium, calcium, magnesium, trace elements, soil management, soil acidity, liming, soil erosion, fertilizers, pesticides, nitrogen fertilizers, phosphate fertilizers, plant protection, problem soils, soil drainage, soil information systems, soil survey methods, soil quality

Topics: soil properties, soil management, tropical environment, temperature, solar radiation, rainfall, tropical climates, vegetation, physiography, Anthropocene, biodiversity, climate change, demographics, Green Revolutions, Tropical Agroecosystems, land use, land-use change, Pedology, Physics, Chemistry, Biology, Laterite Paradigm, tropical soils, tropical soil research, Soil Taxonomy, soil classification systems, soil physical properties, soil temperature, soil structure, soil compaction, soil water, soil erosion, conservation, conservation agriculture, water, rainfed agriculture, irrigated agriculture, irrigation, mineralogy, clay minerals, mineralogy families, Anion Exchange Capacity, soil acidity capacity, Acid Soil Infertility, Liming, overliming, subsoil acidity, secondary acidity, soil biology, soil biodiversity, comminution, decomposition, nutrient elements transformation, soil structure regulation, organic carbon, carbon pools, carbon fractions, animal manures, composts, biochars, organic farming, soil fertility, nutrient cycling, nutrient uptake, determining fertilizer needs, nitrogen cycle, nitrogen pools, atmospheric deposition, biological nitrogen fixation, mineral fertilizers, organic nitrogen mineralization, soil nitrogen fertilizer reactions, Phosphorus Cycle, Phosphorus, Total Soil Phosphorus, inorganic Phosphorus, Phosphorus sorption, Phosphorus release, plant Phosphorus requirements, Phosphorus fertilization, sulfur cycle, sulfur sorption, Sulphur fertilization, Forest–Soil Nutrient Cycles, land clearing, Mechanized Land Clearing, Crop Yield Declines, Field Abandonment, Secondary Forest Fallows, puddling, flooding, rice cultivation systems, Nutrient Management, Yield Stagnation, Nitrogen Sequestration, Livestock-Based Tropical Systems, tropical pastures, Tropical Livestock Management Systems, pastoralism, Smallholder Mixed Crop–Livestock Systems, Extensive Pasture-Based Beef Production, Pasture Degradation, Crop–Pasture Integration, Tropical Tree-Based Systems, Plantation Forestry, Plantation Forestry Species, Agroforestry, Agroforestry Tree Species, Agroforestry Systems, Simultaneous Agroforestry, Sequential Agroforestry, tree crops

Topics: Soil Chemistry, analytical chemistry, geochemistry, Particle Accelerators, Synchrotrons, Stanford Linear Accelerator, Continuous Electron Beam Accelerator, Fermi National Laboratory Accelerator, Brookhaven Realistic Heavy Ion Collider, quarks, leptons, Atomic Numbers, Avogadro’s Number, atomic orbitals, Acid–Base Titrations, Precipitation, Complex Reactions, Chemical Units, Molarity, Molality, Radioactivity, isotopes, mole fractions, Soil Composition, Electrochemical Potentials, carbon dating, Electrochemical Cells, Nernst Equation, Electron Activity, chemical potential, membrane potential, Soil Gas, Oxygen Revolution, soil aeration, soil aerification, Soil Air Quality, Hydrotropism, Hypoxia, soil water chemistry, Oxygen Demand of Water, Total Soil Water Potential, Matric Potential, Pressure Potential, Osmotic Potential, Gravitational Potential, Plant–Soil–Water Energy Relation, water dissociation, Colloidal Chemistry, Colloidal System, soil humus, Carbohydrates, Amino Acids, Peptides, Proteins, Nucleic Acids, lipids, Lignins, humic matter, Electron Microscopy, Clay Minerals, Surface Potential, Electric Double Layer, Helmholtz Double-Layer Theory, Gouy–Chapman Double-Layer Theory, Adsorption Isotherms, soil adsorption, water adsorption, Cation Exchange, Cation Exchange Reactions, Cation Exchange Capacity, Langmuir–Vageler Equation, Mono-Divalent Cation Exchange Reaction, Mono-Monovalent Cation Exchange Reaction, Anion Exchange, Phosphate Retention, Phosphate fixation, Phosphate Potential, Soil Reaction, Acid–Base Chemistry, Weathering, Coordination Theory, Complex Formation, chelation, Metal–Organic Complex Reactions, Clay–Organic Compound Complexes

Topics: Soil mechanics, Soils basic characteristics, Soils nature, Particle size analysis, fine soils plasticity, Soil description, Phase relationships, Soil compaction, Seepage, Soil water, Permeability, Seepage theory, Flow nets, Anisotropic soil conditions, Non-homogenous soil conditions, Transfer condition, Grouting, Frost heave, Effective stress, effective stress principle, Partially saturated soils, Shear strength, Shear failure, Shear strength tests, Sands shear strength, Saturated clays Shear strength, Pore pressure coefficients, Stresses, displacements, Elasticity, Plasticity, Stresses from elastic theory, Displacement from elastic theory, Lateral earth pressure, Rankine's theory of earth pressure, Coulomb's theory of earth pressure, Gravity walls, Embedded walls, Braced excavations, Diaphragm walls, Reinforced soil, Slopes stability, Plane translational slip analysis, long-term stability, Embankment dams, Ground investigation, Borehole logs, Geophysical methods, Ground contamination

Topics: Soil Conservation, Water Conservation, erosion, Soil Erosion and Civilization, Geologic Erosion, Sedimentation, Landscape Development, rock types, Sedimentary Landforms, Mass Movement Deposits, Glacial Landscapes, Water Erosion, erosion damage, Vegetation, Soil Properties, Soil Erodibility, pollution, Water-Erosion Control, Wind Erosion, wind erosion process, Windbreaks, Shelterbelts, Wind-Erosion Control, Predicting Soil Loss, Tolerable Soil Loss, Universal Soil Loss Equation, Computer-Based Soil Loss Prediction Models, Wind-Erosion Prediction Equation, Wind Erosion Prediction System, Soil Map Unit Interpretations, soil survey, Land Use Planning, managing land, cropping systems, Managing Monocultures, crop rotations, Multiple Cropping, Evaluating Cropping Systems, strip cropping, tillage, Conservation Tillage, deep tillage, Contour Cultivation, Emergency Wind-Erosion Control, Gully-Control Structures, road ditches, culverts, Earthen Dams, Streambank Protection, flood control, Wind Erosion-Control Structures, Pastureland Management, Rangeland Management, Forestland Management, water cycle, drought, Soil Drainage, wetlands, Irrigation, Irrigation Methods, Land Reclamation, Conservation Irrigation, soil pollution, pollutants, industrial wastes, agricultural wastes, aerosols, polluted soil, Hazardous Sites, Soil Remediation, Water Quality, water Pollution, Water acidification, Farm Service Agency

Topics: Soil survey, land evaluation, soil survey reports, soil maps, soil mapping processes, soil mapping units, Soil Morphological investigations, soil horizons, soil boundaries, soil colour, soil texture, soil structure, Soil Consistence, Root abundance, Soil pH, Effervescence, Soil Survey Reports writing, Land Suitability Classification, land evaluation procedures

Topics: Soil Fertility, Soil Productivity, Essential Soil Nutrient Elements, Soil Acidity, soil Basicity, Liming, Liming Materials, Soil Alkalinity, salinity, sodicity, soil fertility evaluation, Soil Fertility maintenance, Soil Fertility Management Practices, crop productivity, irrigation, soil tillage, soil organic matter, crop rotation, Continuous Cropping, animal manure, green manure, cover cropping

Topics: Soil Management, Soil Erosion, water erosion, Soil Erodibility, water erosion effects, wind erosion, organic soils, soil organic carbon Sequestration, Regosol, problem soils, polluted soils, sandy soil, shallow soil, skeletal soil, Polluted Soil reclamation, Polluted Soils management, Polluted Soils bioremediation, soil nutrient dynamics, wetland soils, sheet erosion, rill erosion, gully erosion, stream banl erosion

Topics: Exploration, Production Licences, DRILLING PERSONNEL, THE DRILLING PROPOSAL, DRILLING PROGRAM, ROTARY DRILLING EQUIPMENT, DRILLING PROCESS, OFFSHORE DRILLING, DRILLING ECONOMICS

Topics: Rotary Drilling, Geomechanics, Drilling Fluids, Cementing, Drilling Hydraulics, Rotary Drilling Bits, Directional Drilling, Drillstring Design

Topics: Pedology, Soil Physics, soil formation, soil morphology, soil characteristics, soil components, soil-forming rocks, rock weathering, minerals, soil survey, soil mapping, soil classification, Nigerian Soils, Nigerian Soils properties, Nigerian Soils classification

Topics: Soil Morphology, soil Classification, soil horizons, soil boundaries, soil colour, soil texture, soil structure, Soil Consistence, Root abundance, soil formation, catena, Nigerian soil classification, Soil Moisture Regime, soil taxonomy

Topics: Soil Science, silicate chemistry, soil form rocks, minerals, soil composition, soil porosity, soil texture, soil density, soil water relationships, Evapo-Transpiration, tillage, soil properties, Soil Micro-Organisms, Shifting Cultivation, Fallow System

Topics: Drilling Fluids, Lubricity, Corrosivity, Shale Inhibition Potential, Macropolymers, Degasser Suction and Discharge, Shale Shakers, Microtunneling, Desanders, Desilters, Mud Hoppers 2, Hydrocyclones

Topics: Rotary Drilling, Drilling Fluids, cements, casing design, Directional Drilling, Deviation Control, Drilling Hydraulics, Rotary Drilling Bits

Topics: Petroleum Geology, Basic Rock Properties, Petroleum Exploration Methods, General Leasing Practices, Cable Tool Drilling, rotary drilling, rotary drilling fluids, Rotary Drilling Hydraulics, penetrarion rate, Rotary Drilling Techniques, core, core analysis, well logging, formation damage, drill stem testing, oil well cementing, casing practices, well completion

Topics: grain size, particles, water, air, stress in soil, stress in a layer, Darcy's law, permeability, groundwater flow, flotation, flow net, well, stress strain relations, tangent modulus, one-dimensional compression, analytical solution, numerical solution, consolidation coefficient, creep, sheer strength, triaxial test, shear test, pore pressure, stress path, elastic stresses, deformation, boussinesq, newmark, flamant, layered soil, lateral soil, rankine, coulomb, earth pressure, sheet pile wall, limit analysis, strip footing, prandtl, bearing capacity, infinite slope, slope stability, soil exploration, model test, pile foundations

Topics: Soil Fertility, Fertilizers, global population growth, food consumption, food production, agricultural land use, crop yields, nutrient use, Crop Yield Limiting Factors, buffering capacity, mineral solubility, soil acidity, soil alkalinity, Soil pH Buffering, Reducing Soil Acidity Effects, Calcareous Soils, Saline Soils, Sodic Soils, Saline-Sodic Soils, nitrogen, Biological Fixation, Phosphorus, Phosphorus cycle, soil Phosphorus forms, Phosphorus sources, Potassium cycle, soil Potassium forms, Potassium sources, Sulfur, Calcium, Magnesium, Micronutrients, iron, zinc, coper, Manganese, Boron, chloride, Molybdenum, Nickel, Beneficial Elements, soil fertility evaluation, plant nutrient-deficiency symptoms, plant analysis, greenhouse tests, soil testing, nutrient management, soil characteristics, nutrient placement, Nutrient Interactions, nutrient Economics, Agricultural Productivity, Environmental Quality

Topics: Soil Genesis, soil Classification, soil composition, soil morphology, soil-forming factors, soil materials, weathering, soil-forming processes, soil classification systems, soil taxonomy, alfisols, andisols, aridisols, entisols, galisols, histosols, organic soils, Inceptisols, Embryonic Soils, Mollisols, Oxisols, Low Activity Soils, Spodosols, Ultisols, Low Base Status Soils, Vertisols, Shrinking Dark Clay Soils, Swelling Dark Clay Soils