ENVS 2060 Lecture Notes - Lecture 3: Soil Horizon, Northern Ontario, Parent Material

• School: University of Guelph
• Department: Environmental Sciences
• Course: ENVS 2060
• Professor: John Lauzon

Document Summary

How the individual textural particles come together. Arrangement of individual (primary) soil particles into recognizable secondary structures: aggregates or peds. A-horizon (top soil) tends to be granular, and then moving to massive or blocky. Organic matter in it"s decomposed state has a large sa and also a charge, ability to hold aggregates together. How sticky or plastic a wet soil is. How friable or irm a dry soil is: ie. Clay when wet is pliable, and rock hard when dry. Some are consistent depths, and others are more sporadic. May be a relection of the mineralogy of the soil. May be high due to the presence of carbonate. Bedrock in southern ontario is limestone: lots of carbonate = higher ph (neutralizes h, maximum ph = 8. 2, ph of surface horizons are lower because carbonate moves its way down and is weathered out.