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, 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: Oxygen, sulphur, Peroxides, ozone, oxyacids, oxyanions

Topics: kinetic theory of matter, diffusion, compounds, experimental techniques, elements, separating mixtures, gels, sols, foams, emulsions, atomic structure, atomic bonding, Ionic bonding, covalent bonding, glasses, ceramics, metallic bonding, Stoichiometry, chemical calculations, relative atomic mass, reacting masses, calculating masses, moles, chemical equations, electricity, electrolysis, electroplating, chemical energetics, fossil fuels, chemical energy, cells, batteries, chemical reactions, enzymes, acid, base, alkalis, salt formation, crystal hydrates, salt solubility, titration, periodic table, Alkali metal, alkaline earth metals, halogens, noble gases, transition elements, metal, metal reactions, metal nitrate decomposition, metal carbonate decomposition, metal oxide decomposition, metal reactivity, metal waste, rusting of iron, air, water, ammonia, artificial fertilizer, water cycle, water hardness, sulfur, sulfur dioxide, sulfuric acid, inorganic carbon chemistry, limestone, carbonates, carbon dioxide, organic chemistry, alkanes, alkenes, Biotechnology, alcohols, Carboxylic acids, soaps, detergents, Condensation polymers, biopolymers, Pharmaceuticals, Experimental chemistry

Topics: Botany, Ecology, ecological concepts, Ecosystem, Autotrophs, Heterotrophs, Phagotrophs, Osmotrophs, Energy Flow, Food Chain, Food Web, Biogeochemical Cycle, Water Cycle, hydrologic cycle, Carbon cycle, Atmospheric Carbon Cycle, Terrestrial biological carbon cycle, Oceanic carbon cycle, Nitrogen cycle, Nitrogen fixation, Nitrogen Assimilation, Ammonification, Nitrification, Denitrification, Marine nitrogen cycle, Oxygen cycle, Phosphorus cycle, Phosphorous, Sulfur cycle, sulfur, Competition, Mutualism, Predation, Parasitism, Commensalism, Ammensalism, niche, succession, biomes

Topics: Eukaryotic cell, cell, Carbohydrates, Monosaccharides, glucose, Disaccharides, Polysaccharides, Homopolysaccharides, Heteropolysaccharides, Agar, pectin, Glycoproteins, Lipids, Fatty acids, Essential fatty acids.Phospholipids, Glycolipids, Lipoproteins, Steroids, Amphipathic lipids, Soaps, detergents, Proteins, Amino Acids, Nucleic Acids, Nucleotides, Enzymes, DNA, RNA, enzyme activity, Active site, Enzyme inhibition, Enzyme specificity, Coenzymes, enzyme action, Non-protein enzymes, Isoenzymes, Vitamins, Vitamin A, Vitamin D, Vitamin E, Vitamin K, Vitamin C, Ascorbic acid, Thiamine, Vitamin B1, Riboflavin, Vitamin B2, Niacin, Pyridoxine, Vitamin B6, Biotin, Pantothenic acid, Folic acid, Cobalamin, Vitamin B12, Choline, Inositol, Lipoic acid, Para aminobenzoic acid, Bioflavonoids, Antivitamins, Physiological Biochemistry, Digestion, Absorption, Plasma Proteins, Albumin, Globulins, Immunoglobulins, Blood clotting, Hemoglobin, Porphyrins, Hemoglobin derivatives, Abnormal hemoglobins, Sickle-cell anemia, sickle-cell hemoglobin, Thalassemias, Porphyrias, Jaundice, Biological Oxidation, Bioenergetics, High-energy compounds, Electron transport chain, Oxidative phosphorylation, Metabolism, Glycolysis, Citric acid cycle, Gluconeogenesis, Glycogen metabolism, Glycogen storage diseases, Hexose monophosphate shunt, Uronic acid pathway, Glyoxylate cycle, Fatty acid oxidation, Ketone bodies, Fatty liver, obesity, Atherosclerosis, Alcohol metabolism, Amino acid pool, Urea cycle, Glycine, Phenylalanine, tyrosine, Tryptophan, Sulfur amino acids, One-carbon metabolism, Histidine, proline, arginine, Lysine, Glutamate, glutamine, Aspartate, asparagine, Serine, Threonine, Biogenic amines, Polyamines, purine, Mineral Metabolism, Nutrition, Hormones, Organ Function Tests, water, Tissue Proteins, Body Fluids, Molecular Biology, Biotechnology, DNA-Replication, Transcription, Translation, Gene Expression, Recombinant DNA, Human Genome Project, Gene Therapy, Bioinformatics, Xenobiotics, Detoxification, Prostaglandins, Free Radicals, Antioxidants, Environmental Biochemistry, Insulin, cancer, Acquired Immunodeficiency Syndrome

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: Microbial Ecology, microfossils, microorganism diversity, Archaeal Diversity, Fungal Diversity, protist diversity, Algal Diversity, Viral Diversity, cell physiology, metabolism, cell movement, chemotaxis, Bioelectrochemical Activities, energetics, Heterotrophs, Chemolithotrophs, Photophosphorylation, Bacteriorhodopsin Reaction, microbial habitat, Aquatic Habitats, Soil Habitats, microscopy, Molecular Phylogenetics, Metagenomics, Environmental Proteomics, Microbial Interactions, Symbiotic Associations, Mycorrhizae, Nitrogen-Fixing Bacteria, Parasitism, mutalism, microbial communities, biomats, biofilms, Species Diversity, food webs, Primary Production, Energy Flow, Nitrogen Cycling, Sulfur Cycling, Phosphorus Cycling, Iron Cycling, bioremediation, genetic engineering, Xenobiotics degradation

Topics: atomic structure, atomic number, atomic mass, functional group, acid base, alkane, cycloalkane, stereochemistry, alkene, reaction mechanism, alkyne, characterization, organohalide, Nucleophilic substituition, elimination reaction, alchol, ether, sulfur, aromatic compound, aldehyde, ketone, carboxylic acid, carbonyl compound, octet rule, lewis structure, oribital shape, quantum mechanics, bond formation, valence bond theory, electronegativity, dipole moment, resonance structure, isomer, chiral compound, enantiomer, diastereomer, fisher projection, stereoisomer, thermodynamics, kinetics, carbocation, stereochemistry, Markovnikov rule, Hammond postulate, chromatography, spectroscopy

Topics: Mitochondria, NADH, Flavoprotein, coenzyme Q, cytochrome, iron-sulfur protein, copper protein, Q-cycle