A soil has a bulk density of 1.7 g/cm3. One would expect plant growth to:
Answer: be restricted
A soil has a bulk density of 1.7 g/cm3. One would expect plant growth to:
Answer: be restricted
Answer: be restricted
Organic soils often have a bulk density as low as g/cm3.
Organic soils often have a bulk density as low as _____ g/cm3.
Answer: 0.2
A soil has bulk density of 1.9 g/cm3. One would expect plant growth to:
A soil has bulk density of 1.9 g/cm3. One would expect plant growth to:
Answer: cease
A soil has a bulk density of 1.5 g/cm3. One would expect plant growth to:
A soil has a bulk density of 1.5 g/cm3. One would expect plant growth to:
Answer: be normal
Root growth usually ceases when the bulk density of a soil gets above ________ g/cm3.
Root growth usually ceases when the bulk density of a soil gets above ________ g/cm3.
Answer: 1.85
Root growth usually is normal as long as the bulk density of a soil remains below _______ g/cm3.
Root growth usually is normal as long as the bulk density of a soil remains below _______ g/cm3.
Answer: 1.6
Within limits, as one fluffs up a soil it will hold more:
Within limits, as one fluffs up a soil it will hold more:
Answer: available water
A soil has 35 percent pore space. One would expect plant growth to:
A soil has 35 percent pore space. One would expect plant growth to:
Answer: be restricted
Within limits, as the micropore space in a soil increases total water holding capacity:
Within limits, as the micropore space in a soil increases total water holding capacity:
Answer: increases
A soil has a bulk density of 1.3 g/cm3. One would expect plant growth to:
A soil has a bulk density of 1.3 g/cm3. One would expect plant growth to:
Answer: be normal
Root growth is restricted when the when the percent pore space of a soil gets below _________.
Root growth is restricted when the when the percent pore space of a soil gets below _________.
Answer: 40%
Root growth is restricted when the bulk density of a soil gets about ______ g/cm3.
Root growth is restricted when the bulk density of a soil gets about ______ g/cm3.
Answer: 1.6
An acre furrow slice weighs about:
An acre furrow slice weighs about:
Answer: 1,000 tons
An ideal soil would be expected to have a particle density of _________ g/cm3.
An ideal soil would be expected to have a particle density of _________ g/cm3.
Answer: 2.65
A particle density of a soil is influenced by the:
A particle density of a soil is influenced by the:
Answer: mineral and organic matter
Compacting a soil increases its:
Compacting a soil increases its:
Answer: bulk density
Particle density is the _________ divided by the volume of the solids.
Particle density is the _________ divided by the volume of the solids.
Answer: weight when the soil is oven dry
An acre furrow slice weighed 1,847,000 lbs. This value is:
An acre furrow slice weighed 1,847,000 lbs. This value is:
Answer: lower than expected for an idealized soil
As the percent of iron oxides in a soil decreases the particle density _________.
As the percent of iron oxides in a soil decreases the particle density _________.
Answer: increases
A soil lost 5 tons/acre from erosion. This is _________ % of the weight of an AFS.
A soil lost 5 tons/acre from erosion. This is _________ % of the weight of an AFS.
Answer: 0.5
An acre furrow slice is a volume of soil one acre in area to an approximate depth of:
An acre furrow slice is a volume of soil one acre in area to an approximate depth of:
Answer: about 6"
The bulk density of a soil is the oven dry weight of a soil divided by the:
The bulk density of a soil is the oven dry weight of a soil divided by the:
Answer: volume of the soil solids plus the volume of the soil pores
As the percent organic matter in a soil increases the particle density __________.
As the percent organic matter in a soil increases the particle density __________.
Answer: decreases
Two soils are identical except one has a bulk density of 83.7 lbs/ft3 and the other has a bulk density of 96.4 lbs/ ft3. Which has the most pore space?
Two soils are identical except one has a bulk density of 83.7 lbs/ft3 and the other has a bulk density of 96.4 lbs/ ft3. Which has the most pore space?
Answer: The soil with 83.7 lbs/ft3
Plowing a soil _______ the particle density of the soil.
Plowing a soil _______ the particle density of the soil.
Answer: does not change
Bulk density is the _______ divided by the total volume of the soil.
Bulk density is the _______ divided by the total volume of the soil.
Answer: weight when the soil is oven dry
An idealized soil with 50% pore space would be expected to have a bulk density of _________ g/cm3.
An idealized soil with 50% pore space would be expected to have a bulk density of _________ g/cm3.
Answer: 1.325
A soil with a particle density of 3.0 g/cm3 is likely to be rich in:
A soil with a particle density of 3.0 g/cm3 is likely to be rich in:
Answer: iron
Compacting a soil decreases its:
Compacting a soil decreases its:
Answer: percent pore space
Two soils are identical except one has a bulk density of 1.2 g/cm3 and the other has a bulk density of 1.4 g/cm3. Which has the most pore space?
Two soils are identical except one has a bulk density of 1.2 g/cm3 and the other has a bulk density of 1.4 g/cm3. Which has the most pore space?
Answer: The soil with 1.2 g/cm3
A soil with particle density of 2.0 g/cm3 is likely to be rich in:
A soil with particle density of 2.0 g/cm3 is likely to be rich in:
Answer: organic matter
The particle density of a soil is the oven dry weight of a soil divided by the:
The particle density of a soil is the oven dry weight of a soil divided by the:
Answer: volume of the soil solids
The particle density of an average soil is __________ g/cm3.
The particle density of an average soil is __________ g/cm3.
Answer: 2.65
A micropore:
A micropore:
Answer: contains both available and unavailable water
When a soil is field moist, it contains:
When a soil is field moist, it contains:
Answer: both available and unavailable water
At saturation ___________ are filled with water.
At saturation ___________ are filled with water.
Answer: both macropores and micropores
A macropore:
A macropore:
Answer: is primarily for movement of soil gases
Roots grow primarily in the:
Roots grow primarily in the:
Answer: aeration pores
Most of the water in the soil is stored in the:
Most of the water in the soil is stored in the:
Answer: capillary pores
A macropore:
A macropore:
Answer: is important for soil aeration.
At field dry _______ are filled with water.
At field dry _______ are filled with water.
Answer: micropores
An idealized soil would be expected to contain about _________ solids.
An idealized soil would be expected to contain about _________ solids.
Answer: 50%
At field moist _________ are filled with water.
At field moist _________ are filled with water.
Answer: micropores
An idealized soil would be expected to have about _______ of its pore volume occupied by air.
An idealized soil would be expected to have about _______ of its pore volume occupied by air.
Answer: 33%
A capillary pore:
A capillary pore:
Answer: is also called a micropore
An idealized soil would be expected to contain about _______ organic matter.
An idealized soil would be expected to contain about _______ organic matter.
Answer: 5%
Most of the gases in the soil move in the:
Most of the gases in the soil move in the:
Answer: macropores
At field dry, the soil contains:
At field dry, the soil contains:
Answer: unavailable water
An idealized sold would be expected to contain about ________ unavailable water.
An idealized sold would be expected to contain about ________ unavailable water.
Answer: 16 2/3%
An idealized soil would be expected to have about ________ of its pore volume occupied by unavailable water.
An idealized soil would be expected to have about ________ of its pore volume occupied by unavailable water.
Answer: 33%
An idealized soil would be expected to contain about _________ available water.
An idealized soil would be expected to contain about _________ available water.
Answer: 16 2/3%
Most of the water in the soil is stored in the:
Most of the water in the soil is stored in the:
Answer: micropores
An idealized soil would be expected to contain about ________ mineral matter.
An idealized soil would be expected to contain about ________ mineral matter.
Answer: 45%
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