Exam of Components of Soil - Pedology | SOCR 440, Exams of Agricultural engineering

Download Exam of Components of Soil - Pedology | SOCR 440 and more Exams Agricultural engineering in PDF only on Docsity! SC-440 Exam I September 30, 2005 1. (20 Points) . Please name the four major components of soil. For each component provide the relative percentage and describe its “major function (s) ” in soil development. a) b) c) d) 2. (25 pts) The following questions pertain to exchange chemistry in soils. a) Define Cation Exhange Capacity (CEC). b) For each soil material listed below please provide i) an example for each, ii) the relative range of CEC (high, medium, low), iii) the origin of the charge 2:1 minerals - 1:1 minerals - Soil Organic Matter - Rocks - c) What do we mean by permanent versus variable charged materials ? i. Typic Haplaquoll. ii. Typic Hapludult. iii. Typic Udorthent iv. Which soil is the wettest ? v. Which soil is most acidic ? b) Name the great group for each soil taxonomic classification i. Pachic Argiustoll. ii. Typic Cryosaprist iii. Aridic Argiustoll iv. Which soil has the most organic Carbon ? v. Which soil had the lowest Bulk Density ? c) Name the suborder for each soil taxonomic classification i. Aridic Argiustoll. ii . Typic Calciustalf iii. Mollic Ustifluvent. iv. Which soil does not have clay accumulation ? v. Which soil is most likely to have CaCO3 ? 5. (20 Points) What are the key parameters that can be used to differentiate between the following Diagnostic features in soils ? a) Umbric Epipedon vs Mollic Epipedon - b) Spodic Horizon vs Calcic Horizon - c) Oxic Horizon vs Kandic Horizon - d) Ochric Epipedon vs Albic Horizon - e) Argillic Horizon vs Natric Horizon -