Description
For the Soil Formation and Classification unit lab write-up, you will need to submit a pdf file of the following:
a minimum 1-page single-spaced typed write-up based on the AGS 50 Soils Lab 2 Formation and Classification assignment found in your lab module.
Grading for the lab is as follows:
1. Data included for each soil as detailed in part B of the assignment (30 points - 15 points/soil)
2. Summary paragraph comparing the two soils from above (20 points - 10 points/soil)
This lab write-up is worth 50 points toward your grade and is due by the specified due date. No late submissions will be accepted without penalty.
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Explanation & Answer
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Soils Lab 2: Formation and Classification
Name of Student:
Institution Affiliation:
Professor Name:
February 25, 2021
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Soils Lab 2: Formation and Classification
This write-up describes and compares the Cagwin and Toem soil series found in
California, U.S. The soil composition is represented as 45% and 25%, respectively, represented
on the Natural Resource Conservation Service Databases.
1. Cagwin
Section A.
a. Geomorphic position - mountains or backslope.
b. Soil description
The Cagwin series is formed from weathered granite rocks found on side slopes of
mountains. The precipitation occurs within slope ranges of between 5% to 75% at 1016mm at a
temperature of 50C. The soil displays moderately deep but excessively draining characteristics
("California Soil Resource Lab: Soil Web Apps",, 2021).
c. Taxonomic Class
The soil belongs to the family of Mixed, Frigid Dystric Xeropsamments.
d. Typical Pedon description
According to August 8 1968, typical Pedon description, the soil is dry and has dry ground
colours. It has the texture of loamy coarse sand of woodland. It is also on a 40% facing slope in
the southwest region and usually found under Jeffrey pines, manzanita and white fir. These
ground cover crops occur at an altitude of 1981 meters elevation ("California Soil Resource Lab:
Soil Web Apps", 2021).
e.
Geographic Setting
The climatic conditions that favour weathering of granite into the Cagwin soils are
humidity of between 480- 1400 mm annual precipitation, usually in snow seasons. The
temperature is averaged between 5 to 8 degrees Celsius annually. In January, the mean
temperature is between -3 to -2 degrees Celsius, while in July, it is at 13 to 16 degrees Celsius,
and the frost-free season takes less than 80 days. The elevation is on mountainside slopes,
ranging from 5 to 75 per cent. The elevation altitude ranges from 1524- 2580 meters ("California
Soil Resource Lab: Soil Web Apps", 2021).
f. Drainage and Permeability
The Cagwin series has a moderate and rapid permeability higher than the paraphilic
contact. It displays excessive drainage and a low to medium runoff.
g. Use and Vegetation
The soil properties make it suitable for timber production, making watersheds or even for
a habitation of wildlife. The vegetation growth supported by the soil is either dense or semidense, with the most common vegetations as white fir, California red fir or Jeffrey pines.
h. Series established
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The Cagwin series was established in 1970 within the Tahoe Basin in El Dorado County,
California.
Section B
I.
Statewide acreage total
In the Cagwin soil series, the total acreage within California is 162,872 acres from the 8
Pedon samples collected.
II.
General description of soil series location
The Cagwin is distributed in the mountainous regions of the Northern part of California
to a moderate extent.
Section C.
a. Soil Profiles:
b. Soil Taxonomy:
order
Entisol...