TOFG-all

Soils & Soil Physical Properties

Unit 2.1 | Part 2 – 28

Demonstration 2: Soil Pit Examination

for the instructor

DEMONSTRATION OUTLINE

A. Determine Approximate Textural Classification of

Soil by Feel

B. Identify Distinct Soil Horizons

1. A Horizon and what defines it


2. B Horizon and what defines it


3. C Horizon and what defines it


4. Identify indicators of soil disturbance (e.g., tillage)

C. Describe/Define the Type(s) of Soil Structure Observed

1. Describe general soil structure and how it is created


2. Identify and provide examples of soil aggregates and
   how they form

INSTRUCTOR OVERVIEW

In this demonstration, students

examine the soil profile and various

soil properties exposed in a shallow

soil excavation. Discuss the soil

profile and how the soil properties

observed affect the use of the soil

for farming, gardening, and other

purposes.

MATERIALS

• Shovel and Pic mattock (to dig pit)


• Munsell soil color book


• Water bottle for moistening soil


• pH kit

SITE PREPARATION

Several hours before the demonstra-

tion dig a pit approximately 2–4 feet

deep (or until distinct soil horizons

are observed). For ease, the pit may be

triangular in shape and stepped. Plan

to have the soil profile in full sun at the

time of the demonstration.

PREPARATION TIME

Approximately 1 hour

DEMONSTRATION TIME

1 hour

Instructor’s Demonstration 2: Soil Pit Examination