Download Soil Science Test #4 - April 2008 - Prof. Paul Mcdaniel and more Exams Agricultural engineering in PDF only on Docsity! SOIL 454, Test #4 April 24, 2008 Name __________________________ Lottery pick ____ ____ 1. This landscape and soil from central Idaho formed under an Idaho fescue-sagebrush community and has a cryic temperature regime. The soil has a subsurface zone of clay accumulation. Which classification is most appropriate? (2 pts) [Andixeroll ; Argiustoll ; Argialboll ; Argicryoll ; Pachiudoll ] (circle correct answer) List 2 diagnostic horizons or features:
_____________________ _____________________ The term Pachic, pachi- applies to this soil - what does it refer to? 2. This highly weathered Hawaiian soil has ustic/hyperthermic regimes and silty clay textures throughout. List 2 diagnostic horizons or features present:
_______________________ _________________________ What is the order? ____________________ Give the name of a dominant mineral (be specific): _________________________ 3. This soil is found in the southeastern US, contains a Bt horizon, and has % base saturation ranging from 18-32. The Bt horizon contains ~70% clay and is dominated by kaolinite. What is the order? ___________________ What is the suborder? ___________________ List 3 diagnostic horizons or features: _____________________ _____________________ _____________________
4. This soil contains an argillic horizon, % base saturation ranging from 49-82, and an ustic soil moisture regime. What is the order? ______________ Suborder? ______________ Based on appearance would this soil likely be found in the northern or southern part of the US? (circle choice) Why? Give designations for 3 horizons indicated: ________ ________ ________ 5. This soil from southern Idaho has an aridic moisture regime. What is the order? _____________ What is the horizon designation for the indicated cemented area? ____________ List 3 diagnostic horizons or features: _______________ ______________ ______________ 6. Explain how the classification of a Mollisol can be affected as a result of long-term cultivation (2 pts). 7. List one characteristic shared by all Alfisols and Ultisols. How are these soils distinguished from one another in Soil Taxonomy? (2 pts)
