APBI 200 Lecture Notes - Lecture 4: Bulk Density, Pedogenesis, Soil Science
Document Summary
Need to know: definition of soil, 5 factors of soil formation, weathering, component, air, organic matter, water, inorganic/minerals, soil = f (cl, topo. , p. m. , biota, time) Soil physics is the branch that deals w the state and transport of matter and transformations of energy in the soil. 3 phases of soil: liquid, water and solutes such as ions, organic compounds, and gases, solid, the soil matrix -> mineral and organic matter, gas, various gases such as o2, co2, n2. Density of solids or particle density (ps: density of organic matter is approx. 1300 kg/m^3: density of water is around 1000 kg/m^3, density of air is negligibly small. In most mineral soils, particle density is approx. In most mineral soils, bulk density is about 1300-1350 kg/m^3. In most mineral soils, porosity is about 0. 3-0. 6 (30-60%) Ps= ms/vs f= vf/vt -> m^3 pores/ m^3 soil f= 1 vs/vt. Soil water content on a volume basis (theta)
