GEV 1003 Lecture Notes - Lecture 30: Soil Texture, Soil Fertility, Weathering
20 Jan 2018
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Document Summary
Key words/topics: all four elements of the environment, composition, characteristics, leeching/horizons, orders, location, fertility. Soil depth: equator = thick, subtropics = thin, mid-latitudes = thick, poles = thin. Solid rock to small pieces: physical and chemical weathering: chemical weathering: wet and warm (water and temperature, mostly physical weathering. Soil color: organics: dark: high organic content, rich in organic nutrients, fertile, carbon breaking down by decomposition, pale soil: pale, gray, white, bright orange or red: nutrient poor soil: especially poor in organic material, oxidized: red. Soil texture: the size of the particles themselves. Leaching: vertical erosion: dissolved minerals and small particles, taking material from upper levels of the soil and transporting them down (can be particles like sugar in ice tea, soluble in water, carried downward by water, creates soil horizons. Horizons organic basically compost low in mineral rock, dark black and fertile. Most fertile: has organics leached downward meeting minerals dissolved below.
