FANR 3060 1st EditionLecture 7Outline of Last LectureI. The 5 factorsOutline of Current LectureI. The 4 processes (con’t)II. Soil ClassificationIII. Diagnostic HorizonsChapter 2con’tI. The 4 processes con’ta. Fig 2.4i. A1. Takes about 100 years to form2. Organic mattera. Additions3. Erosiona. Lossesii. E1. leachinga. Lossesiii. BThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.1. Takes thousands of years to form2. Translocationa. Of clay and iron from the A/E horiz into the Bb. Depends on climate and type of parent materialiv. C1. Takes millions of years2. R horizon (rock/parent material) to transform into C horizona. Transformationsi. WeatheringChapter 3I. Soil Profilesa. Profile descriptioni. Properties of a pedon1. Pedon = smallest unit of soil that expresses all variation in horizon,properties, etcii. What we classifyiii. Includes the profile, properties, and namesb. Hierarchical structure of groupings within groupings that show relationships between soilsc. First soil classification system used widely in U.S. was based on a Russian systemi. 1920sd. Changed systems in the 1960se. Soil Taxonomyi. Provide broad yet complete system for classifying soilsii. Used to interpret broad suitability of soils for diff usesiii. Provides basic understanding of relationships between diff soil typesII. Diagnostic Horizonsa. 4 diagnostic A horizi. Mollic1. Thick and dark colored2. Must be at least 10” thick3. 3/3 or darker 4. High in bases5. Granular structure because it’s made mostly of humus6. Prairieii. Umbric1. Umber = dark brown2. Deep, dark colored3. Must be at least 10” thick4. Low in basesiii. Histic1. O horizona. Highly decomposed O horizoni. Made of peat1. Also known as Oihorizii. Can also be made of muck1. Oahoriziv. Ochric1. Light colored/shallow A horiz2. Most common A horiz in GAa. 90% of A horiz in GA are this3. “normal
View Full Document
Unlocking...