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: 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 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 Tests analysis Laboratory Guide, Plant Analysis Laboratory Guide, soil analysis, soil testing, Sample Aliquot Determination, Soil pH, Soil Storage, Soil Buffer pH, Adams–Evans Buffer, Mehlich Buffer, Titratable Acidity, Exchangeable Acidity, Liming Materials, Extractable Phosphorus, Olsen’s Sodium Bicarbonate, Ammonium Bicarbonate–DTPA, Plasma Emission Spectrometry, UV-VIS Spectrophotometry, Cation Determination, Micronutrients, Trace Heavy Metals, Extractable Nitrate–Nitrogen, Extractable Sulfate–Sulfur, Monocalcium Phosphate, Humic Matter Content Determinations, Wet Digestion, Soluble Salt Determination, Soil Texture, plant analysis, Sample Preparation, Petioles, Decontamination, Tissue Testing, Nitrate–Nitrogen Test, Nitrate–Nitrogen Stalk Test, Instrumental Analysis, Emission Spectrophotometry, Flame Emission Spectrophotometry, Atomic Absorption Spectrophotometry, Inductively Coupled Plasma Emission Spectrometry

Topics: Soil Chemistry, water chemistry, pollution science, soil composition, nitrogen, phosphorus, boron, iron, Manganese, Molybdenum, Ion Exchange Phenomenon, Cation Exchange Capacity, Anion Exchange Capacity, Flocculation, Buffering Capacity, Soil Salinity, Alkalinity, Sodicity, Soil Reaction, Soil Organisms, Fungi, Actinomycetes, bacteria, Algae, Nematodes, Earthworms, Termites, soil organic matter

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 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: Qualitative analysis, organic compounds, hybridization, organic acids, organic bases, isomerism, organic reactions, isomerism, hydrocarbon chemistry, aliphatic hydrocarbons, alicyclic hydrocarbons, aromatic hydrocarbons, functional group chemistry, alcohol, phenol, ethers, thiols, thioethers, halohydrocarbons, amines, ketones, aldehydes, carboxylic acids, carbohydrate chemistry, amino acids, polypeptides, proteins, lipids, inorganic chemistry, bonding, transition elements, chemical industry, pollution

Topics: Soil Microbiology, Soil Environment, soil component, Microbial flora, fauna, Microflora, Soil Bacteria, soil fungi, soil algae, nitrogen cycle, nitrogen fixation, Nitrification, Denitrification, Mineral Formation, Mineral Biodeterioration

Topics: Soil Mineralogy, soil fertility, soil chemistry, pedology, Soil composition; soil air, soil water, kaolinite, Illite, Smectite, Mixed layer Clays Silica minerals, Iron, aluminum oxides, hydroxide, oxyhydroxides, Differential thermal analysis, X-Ray diffraction analysis, Infrared spectroscopy