GEO 110 Lecture Notes - Lecture 8: Aeration, Tillage, Seedbed
5 Mar 2018
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Document Summary
Soil: the most important natural resource, dirt, minerals, living organisms, water, air, not considered soil until it can support life. Temp soil absorbs heat from sub, loses heat from atm (plant growth seed germination) Weathering process breaking down rocks into soil: water freezing, thawing, landslides, wind and chemical action, water is worse than wind because of freezing and thawing. Five factors of soil development: parent material, climate, variation in earths surface (topography, plant and animal life, time. Soil components: mineral matter 45% (decomposed rock material, organic matter 5% (decomposed plant and animal matter, air 25, water 25, air and water fluctuates because of saturation. Landslides b/c of no root structure holding it in place. Living organisms: earthworms, insects, bac, fungi, etc. In soil, they break down organic matter and release nutrients: silins are derived from fungi. Soil tilth workability of soil: create openings in soil as they tunnel, enhances drainage and imporves air exchange.
