APBI 200 Lecture 6: APBI 200 LEC 6 APPLIED BIOLOGY 200 SOIL SCIENCE UBC 2019
Document Summary
Attractive force between h+ and electronegative atoms e. g. o, n, fl. Apbi 200 lec 6: hydrogen bond holds layers in kaolinite, important in retaining water in soils, isomorphic substitution gives soil its negative charge. F is inversely proportional to size of the electron and directly proportional to the valence of the electron (f = valence/size) Flocculation is a state when primary particles (ex. clay particles) remain close together due to interactive forces (electrostatic, van der waals, and/or hydrogen bonding) and form microscopic clumps or floccules. Aggregation= flocculation + cementation: particles close together, shrink swell, roots, flocculation, cementation, glue (from sticky organic substances, coating. Cementation represents stabilization of floccules by action of a cementing agent (organic compounds, fe/al oxides, clay, carbonates) With large pores between aggregates and small pores within aggregates there is better infiltration. Clay texture class (silty clay, silty clay loam)
