Topics: soil microclimatology, weather elements, climate, atmospheric dynamics, solar radiation, heat transfer, Atmospheric Moisture, soil moisture, soil properties, soil conservation, Climatic Variables measurement, Evaporation, Evapotranspiration

Topics: Soil Analytical Techniques, Analytical Laboratory, Quality Assurance Control, Precision, Accuracy, Laboratory Chemicals, soil sampling, plant sampling, Nitrogen Determination, Phosphorus Determination, Potassium Determination, Colorimeter, Flame Photometer, Atomic Absorption Spectrophotometer

Topics: Irrigation, Drainage, Soil-water-plant-atmosphere relationship, Irrigation requirement, Consumptive water use, evapotranspiration, Irrigation scheduling, Irrigation resources, irrigation equipment maintenance, Irrigation systems, Irrigation techniques, soil reaction, soil erosion, soil drainage, Soil salinity, soil alkalinity, soil acidity

Topics: soil, soil water, soil plant water relationship, irrigation, drainage

Topics: Alkylation of Enolates, Alkylation of Carbon Nucleophiles, Reactions of Carbon Nucleophiles with Carbonyl Compounds, functional group interconversion, Electrophilic Additions, Electrophilic Cyclization, Reduction of Carbon-Carbon Multiple Bonds, Concerted Cycloadditions, Unimolecular Rearrangements, Thermal Eliminations, Organometallic Compounds, Carbon-Carbon Bond-Forming Reactions, Organoboron Compounds, Organosilicon Compounds, Organotin Compounds, Aromatic Substitution Reactions, Oxidations, Multistep Syntheses

Topics: soil habitat, Microorganism, bacteria, nitrogen fixer, disease suppressor

Topics: elements, compounds, atomic theory, chemical reaction, atom constituents, chemical symbols, chemical formulae, chemical reactions, chemical equations, electronic configuration, atomic number, mass numbers, nuclear atom, electronic, energy levels, Ion formations, nuclear reactions, radioactivity, nuclear radiations, nuclear fusion, nuclear fission, radioactivity hazards, chemical bonding, electrovalent bonding, Ionic bonding, electrovalent compounds, covalent bonding, covalent compounds, coordinate covalent bonding, dative covalent bonding, metallic bonding, intermolecular bonding, Van der Waal's forces, dipole-dipole attractions, hydrogen bonding, periodic table, periodic law, transition elements, atomic orbital model, principal quantum number, subsidiary quantum number, azimuthal quantum number, magnetic quantum number, spin quantum number, atomic orbital shape, atomic size, ionic radius, ionization energy, electron affinity, electronegativity, mole concept, melting, vaporization, boiling point, evaporation sublimation, heating graphs, cooling graphs, Boyle's law, Charles's law, Avogadro's law, boiling, solid classification, solid properties, molecular solid, metallic solid, Ionic solid, covalent solid, energy changes, heat content, heat of reaction, exothermic reactions, energy level diagrams, standard state, thermochemical equations, entropy, entropy change, free energy, chemical kinetic, rate of a chemical reaction, temperature, gas pressure, catalyst, activation, reaction rate, collision theory, Le Chatelier's principle, Haber process, contact process, salt hydrolysis, buffer solutions, common Ion effect, solubility product, Acid bases, salt, electrolysis, redox reactions, electrolytic conduction, oxidation, reduction, copper purification, electroplating, quantitative hydrolysis, metal corrosion, iron rusting, carbon, carbon allotropes, Diamond graphite, amorphous carbon, combustion reactions, industrial gas chemistry, metals, alloys, chemical industry, heavy chemicals, fine chemicals, fertilizers, plastics, soaps, detergents, pharmaceuticals, Nigerian chemical industry, aromatic compounds, Alicyclic compound, heterocyclic compound, homologous series, functional groups, isomerism, structural isomerism, geometric isomerism, IUPAC Nomenclature of organic compounds, purification methods, distillation, crystallization, chromatography, empirical formula, molecular formular, alkanes, natural gas, petroleum crude oil, benzene, fractional distillation petrol quality, cracking, isomerization, petrochemicals, alkanols, alkanoic acid, alkenoate, fat, oils, amino acid, polymer chemistry, polymerization processes, condensation polymerization, resins, natural polymers, carbohydrates, proteins, synthetic polymers, water pollution

Topics: soil resources, soil composition, soil properties, soil classification systems, Earth Natural Resources, land use, land cover change, Microorganisms interaction, organic materials interaction, inorganic materials interaction, Fertiliser effects, Pesticides effects, herbicides effect, Environmental Impact Assessment, Environmental Impact Assessment Processes, acid rain, Acid rain effects, Soil Organic Matter, Soil Living Organisms

Topics: Redox reactions, voltaic cells, electrode potentials, Nernst equation, electrolytic cells, oxidation numbers, balancing redox equations, redox chemistry, Electrochemistry, voltaic cells, cell notation, electrolytic cells, standard electrode potentials, standard hydrogen electrode, standard redox table, standard cell voltage, redox reactions, standard cell potential, equilibrium constant, Nernst equation

Topics: Matter, Measurement, Atom, Molecule, Ion, Stoichiometry, Reactions in Aqueous Solution, Gas, Electronic Structure, Periodic Table, Covalent Bonding, Thermochemistry, Liquid, Solid, Solution, Rate of Reaction, Gaseous Chemical Equilibrium, Acid, Base, Equilibria in Acid-Base Solutions, Complex ion, Precipitation Equilibria, Spontaneity of Reaction, Electrochemistry, Nuclear Reactions, Complex Ions, Coordination Compounds, Metal, Nonmetal, Organic Chemistry, Organic Polymers