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Quiz 3 - Answers

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Quiz 3 - Answers 1.) T F Conservation tillage refers to methods of preparing the soil for planting that are more likely to disturb or move soil than conventional ... – PowerPoint PPT presentation

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Title: Quiz 3 - Answers


1
  • Quiz 3 - Answers
  • 1.) T F Conservation tillage refers to
    methods of preparing the soil for planting that
    are more likely to disturb or move soil than
    conventional tillage.
  • 2.) T F One thing soil color helps to
    identify is the moisture regime of a soil.
  • 3.) a. What textural class is a soil with 10
    clay and 60 sand?
  • sandy loam
  • b. What silt would this soil have?
  • 30 silt
  • c. Can you change a soils textural class by
    adding organic matter?
  • No
  • d. Why or why not?
  • Soil texture is a property referring only to
    the mineral particles therefore organic matter
    plays no part in determining a soils textural
    class.
  • 4.) What is the pore space of a typical mineral
    soil having a Db of 1.05 Mg/m3? 60.4 pore
    space
  • 5.) What did you learn about bulk density from
    the Sharratt article?
  • Some possible answers In areas of compaction,
    bulk density can be higher. Bulk density did not
    account for a thinner A horizon. The effects of
    compaction causing greater bulk density can last
    for 100 yrs.

(1) (1) (4) (2) (2)
2
  • http//nature.berkeley.edu/classes/espm-120/

3
Photo of Soil ProfileClassification Typic
Haplohumult
4
REVIEWProcesses of Soil Formation
CO2 flux
  • Additions
  • Organic C
  • Dust
  • Removals
  • CO2
  • Weathering products
  • Transfers
  • Clay
  • Organic matter
  • Carbonate
  • Transformations
  • Plants to SOM
  • Primary silicates to secondary silicates,
    carbonates

OM additions, OM transformations, weathering
Clay transfers
Clay and carbonate transfers
Leaching
5
Soil Horizon Nomenclature
  • Based on interpretation of dominant soil forming
    processes affecting that horizons
  • Names based on presumed changes relative to
    parent material (t0)
  • Universal with some variance
  • Originated by Russians in 19th Century

6
Master Horizon Nomenclature
7
Example
A
Bt
Btqm
BC
8
Master Horizon Subdivisions
9
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10
Chapter 3Soil Classification
  • It is embarrassing not to be able to agree on
    what soil is. In this the pedologists are not
    alone. Biologists cannot agree on a definition
    of life and philosophers on philosophy.
  • -Hans Jenny
  • from The Soil Resource Origin and Behavior

11
Classification
  • Pedon the smallest volume that can be called a
    soil
  • Polypedon two or more contiguous pedons, also
    called soil individual
  • Landscape region, tract of land
  • Figure 3.1

12
Classification
  • Genetic horizon soil layers resulting from
    soil-forming processes (pg. 73)
  • presence or absence help classify soil
  • Diagnostic horizon soil layers having specific
    soil characteristics indicative of certain
    classes of soils
  • at surface epipedon
  • below surface diagnostic subsurface horizon
  • Figure 3.4

13
(No Transcript)
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