Exam 4: Soil Architecture and Physical Properties

For which substance would the particle density equal the bulk density?

In many soil profiles,the subsoil is high in clay,but is also quite permeable to percolating water.Why?

Fungal hyphae have an important influence on soil structure because they ______.

The percentages of which soil components represent the minimum information necessary in order to determine the textural class of a soil?

Polysaccharides produced by soil microbes and similar synthetic polymers applied to soils are largely responsible for the crusts that form when rain follows tillage.

Subsoiling is a primitive deep tillage technique that results in extremely high subsoil bulk density.

Practices that add organic matter and reduce tillage can be expected to most significantly increase the _____ in a soil.

Light colored surface soils are likely to be warmer than dark-colored surface soils if soil moisture and other conditions are the same.

Proper timing of tillage is generally more difficult for a clayey than for a sandy soil.

A soil with a bulk density equal to 0.35 Mg/m³ is most likely what type of soil?

A sticky,putty-like feel indicates a high percentage of which soil separate?

A landscaping contractor wants to change the texture of a silt loam soil to meet the specifications for a loam.S/he would most likely do so by adding ______ to the soil and mixing it well.

Flocculation is the process by which certain chemicals in the soil stabilize large soil aggregates.

Dull gray colors are characterized by _____.

Soil consistence changes with changes in soil water content.

When preparing a surface soil seedbed,the soil should generally be in the loosest,least dense soil condition in the row where the seed is placed.

The difference between the liquid and plastic limits of a soil is _______.

Soil colors are scientifically described by ____ color designations such as 10YR3/4.

Tillage when the soil is too wet is likely to increase the soil bulk density.

Because of their greater surface area per unit of soil mass,silt loams soils generally have a greater capacity than loamy sand soils to ___.