Soils: an introduction to soils and plant growth
Soils: an essential world resource; Parent materials and soil formation, soil genesis; Physical properties of soils; Soil water; Chemical and colloidal properties; Soils and plant nutrition; Soil organic matter; Soil ecology and environmental quality; Fertilizers and their use; Soil diagnosis; Acid soils and lime; Saline and sodic soils and their reclamation; Organic amendaments and recycling of wastes; Tillage; Soil conservation and management; Water quality and irrigation; Drainage systems; Soils classification; Soil surveys, interpretations, and use planning; Soils of the humid tropics and subtropics; Soil requiring unusual management; Soils, food production,a nd world population.
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The character of soil
Soils and wastes
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acid acre Agricultural aluminum ammonium amount areas Aridisols bacteria bulk density calcium carbon cation exchange cation exchange capacity chemical clay climates color corn Courtesy crops cultivated decompose deficiency depth developed drainage drained erosion feet fertilizer field capacity grain grasses Histosols horizons humus inches increase ions iron irrigation water kaolinite kg/ha land layer leaching lime loam magnesium manures mineral moist Mollisols montmorillonite mulch nitrate nitrogen organic matter organic soils oxides Oxisols oxygen parent material particles peds percent percentage phosphate phosphorus plant growth plant nutrients plant roots plow pore space potassium pounds production rainfall reduce residues runoff sample sand sandy silt slopes sodium Soil classification soil moisture soil orders soil pH Soil Science soil structure soil surface Soil Survey soil test Soil texture soil water Spodosols suction sulfate sulfur Table tensiometers tillage tropics Ultisols United USDA—Soil Conservation Service usually vegetation Vertisols yields