Homework Exercise 2

Homework Exercise 2 - Soil Science 325 Homework Exercise 2...

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Soil Science 325 Homework Exercise 2 Due September 30, 2004 Attached are four soil descriptions in standard written format in a soil survey report. In this exercise you are to do the following: A) “Condense” the text onto the description sheets we use for our field laboratory. Fill in the appropriate columns with the collated information and use abbreviations as given for the different descriptive criteria in the NRCS “Field Book for Describing and Sampling Soils” (http://soils.usda.gov/technical/fieldbook/). You will find these abbreviations on the page for the feature described under the heading “Code”. Use only the “NASIS” column . B) The soil series name and taxonomic classification for each of the soils is provided. Fill in the appropriate information from each soil description for the diagnostic horizons and the classification of the soils. You can use “Keys to Soil Taxonomy” (http://soils.usda.gov/technical/ classification/tax_keys/) to help with this part of the exercise – all definitions and categories are found in the text. There is a separate file called “Homework 2 Examples” that will give you the page numbers in the “Field Book for Describing and Sampling Soils” to help get you started. These examples demonstrate the format for completing this exercise. A few notes: rocks of any type must go in the “Fragments” column, clay films and carbonate features go in “Coatings” column, mottles and other redoximorphic features (related to iron and manganese) go in the “Mottles” column, and put dry colors, when listed, in parenthesis in the “Color” column. 1) The Williams series consists of very deep, well drained, moderately slow or slowly permeable soils formed in calcareous glacial till. These soils are on glacial till plains and moraines and have slope of 0 to 35 percent. Mean annual air temperature is about 5 degrees C, and mean annual precipitation is about 35 cm. TAXONOMIC CLASS: Fine-loamy, mixed, superactive, frigid Typic Argiustolls TYPICAL PEDON: Williams loam - cultivated. (Colors are for dry soil unless otherwise stated) Ap --0 to 15 cm; dark grayish brown (10YR 4/2) loam, very dark brown (10YR 2/2) moist; weak medium subangular blocky structure; slightly hard, very friable, slightly sticky and slightly plastic; common very fine roots; few pebbles; neutral; abrupt smooth boundary. (10 to 22 cm thick) Bt1 --15 to 25 cm; brown (10YR 4/3) clay loam, dark brown (10YR 3/3) moist; strong medium prismatic structure parting to strong medium angular blocky; hard, firm, sticky and plastic; common very fine roots; many distinct clay films on faces of peds and lining pores; few pebbles; neutral; clear wavy boundary. Bt2
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Homework Exercise 2 - Soil Science 325 Homework Exercise 2...

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