182 quizzes
The range in bulk density for mineral soils is about ______.
1-1.6
Given a soil with 43.7% pore space, oven dry weight of 127g and particle volume of 48.3 cm3. The bulk density of the soil is ____ g/cm3.
1.48
What is the bulk density of a soil with the following properties?Soil Volume = 150 cm3Wt. of dry soil = 275 g
1.83 g/cm^3
A soil weighs 450 g when wet and 390 g when oven dry. Its total volume is 200 cm3 and the solid volume is 165 cm3. The particle density is:
2.36 g/cm^3
Which of the following would indicate a horizon containing a parent material different from the parent material of the overlying horizon?
2B
If a field loses 20 tons of soil per acre per year, how many years will it take to lose an acre furrow slice of soil?
50 years
A soil has a bulk density of 1.19 g/cm3. What is the % total pore space in this soil?
55%
An ____ horizon is an eluviated mineral horizon containing a significant accumulation of organic matter.
A
The horizon of maximum eluviation is called the ____ horizon.
A
A soil contained the following horizons:1 An eluviated zone of mixed mineral and organic matter2 A zone with some increase in silicate clay3 A zone with more increase in silicate clay4 A zone with less silicate clay accumulation than Horizon 35 Unweathered loamSelect the correct horizon designation for this profile.
A-BA-B-BC-C.
Which of the following horizons were selected from a profile which contains three different parent materials?
Ap-2E-3E
The zone of illuviation is the _____ horizon.
B
Well developed blocky structure is most common in the _______ horizon.
B
A transition horizon in which illuviation is the dominant process is:
BA
Which of the following is an incorrect horizon designation?
CE
Well developed platy structure is most common in the _______ horizon.
E
The most common form of iron found in oxidized conditions is:
Fe2O3
Soil components include: Ca, clay, iron oxides, K, Mg, Na and silt. The soluble salts by definition include:
K and Na
A horizon with redoximorphic features is, by definition,:
NOT a regosol. high in clay. spotted with orange and yellow colors caused by alternate warming and freezing. well drained.
Redoximorphic features are caused by:
alternating level of the water table
Which one of the following types of soil structure is most likely to be found in the B horizon?
blocky
In the Munsell system, the purity of a color is given a number that represents its _____
chroma
The most desirable structure in the A horizon is:
granular
The type of structure most likely to be found in the surface of Alabama soils is:
granular
One soil horizon has a moist color of light gray 10YR 5/2, while one has a moist color of weak red, 2.5YR 5/2. The difference in color probably reflects a difference in ______
hue
The bulk density of a soil generally _____ with depth.
increases
The particle density of a cultivated soil is _______ the methods of tillage used on the land.
independent of
Gray soil colors occurring in the lower horizons of wet soils indicate the presence of certain compounds of:
iron
A high bulk density in a soil with a normal particle density would suggest the soil has:
low permeability
Soil parent material is more likely to have _____ structure.
massive
A red color in soils is indicative of:
oxidized and dehydrated iron
Soil colors of gray indicate:
poor internal drainage
Which of the following soil structure types is most likely to be found in a zone enriched with clay?
prismatic
A soil with a normal particle density has a bulk density around 1.87 g/cm3. Plant growth will be:
severely restricted
A Bt horizon has an accumulation of:
silicate clay
As bulk density increases the percent of the total volume occupied by __________ in soils increases.
solids
capillary pores
store soil water
An R horizon symbol:
suggests a zone contains bedrock.
The regolith is the layer of unconsolidated material overlying bedrock.
true
A soil has a moist color of light gray 10YR 7/2, while one has a moist color of very dark grayish brown, 10YR 3/2. The difference in color probably reflects a difference in ______
value
_________ is(are) essential to the formation of platy structure.
wetting/drying and freezing/thawing fronts
