GEO 210 Lecture Notes - Lecture 12: Soil Texture, Soil Fertility, Soil Structure
8 Apr 2020
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Document Summary
Soil as a component of the landscape: easy to overlook, visible in plowed fields, in road cuts, on eroded slopes, and at construction sites. Interface where lithosphere and the atmosphere, hydrosphere, and biosphere interact: begins with the weathering of rock. Soil development: active factors, the biological factor, climatic temperature and moisture, biological roots, compaction tunneling, burrowing, waste, carcasses, organic matter, nutrients for plants, soil texture and color, soil aeration and mixing, root penetration, burrowing animals. Soil-forming factors: chronological, very slow, climate, parent material. How soils differ: soil chemistry determines presence and availability of nutrients to plants, soil properties, color, texture, structure. Soil properties: texture, feel for particle sizes, separates in size classification groups, structure, particles aggregate into peds, soil structure types, porosity and permeability. Soil chemistry: acidity/alkalinity, ph of a solution, acidic solution, basic solution, ph scale, role in soil fertility, soil horizon, o horizon, organic matter, a horizon, top soil/dark color, e horizon, eluviation layer, b horizon.
