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 Microbiology, soil habitat, soil solution chemistry, bacteria, archaea, Phylogeny, Biodegradation Capacity, soil fungi, Fungal Communities, Soil Fauna, Microfauna, Mesofauna, Macrofauna, Macroarthropods, protozoa, rotifera, nematoda, Microarthropods, Enchytraeids, DNA Reassociation Kinetics, soil biota, Microbial Metabolism, Plant-Soil Biota Interactions, carbo cycling, Rhizosphere, Geological Carbon Cycle, biological Carbon Cycle, Light Microscopy, Scanning Electron Microscopy, Transmission Electron Microscopy, Atomic Force Microscopy, X-Ray Spectro-Microscopy, X-Ray Computed Microtomography, Reaction Kinetics

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 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: 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

Topics: Chemistry, matter, atomic structure, periodicity, chemical bonding, descriptive chemistry, stochiometry, kinetic theory, energetics, chemical kinetics, chemical equilibrium, acid, base, salt, electrochemistry, nuclear chemistry, organic chemistry, IUPAC Nomenclature, hydrocarbons, organic families, organic giant molecules, industrial chemistry, environmental chemistry, experimental chemistry, Lamlad

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 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, soil water, soil plant water relationship, irrigation, drainage

Topics: Soil Fertility, water management, Mineral fertilizer, Phosphate fertilizers, Organic manures, Farmyard manures, compost, sewage, soil sampling, Soil water conservation techniques, erosion control methods