Practice Soils Envirothon Questions

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Practice Soils Questions for the Virginia Dominion Energy Envirothon Program; Visit https://vaswcd.org/additional-study-resources for more study resources. You will be able to see the correct answers after submitting your test. A copy of your test will be emailed to you.

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Soil texture is defined as percentages of what 3 components?

0 points

clay, porosity, water content

sand, silt, rock fragments

clay, silt, microbes

D. sand, silt, clay

Clear selection

Which of the following components is primarily responsible for the color of the topsoil (A horizon)?

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Manganese oxide

Iron oxides

Organic matter

Various Sulfur compounds

Clear selection

Where would you expect to find the youngest soils?

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Summit of a hill

Floodplain

Backslope

Sinkhole

Clear selection

Where would you expect to find the oldest soils?

Summit of a hill

Floodplain

Backslope

Sinkhole

Clear selection

Which soil structure indicates compaction?

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Subangular blocky

Massive

Platy

Granular

Clear selection

What is the best way to control loss of soil nutrients?

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Apply only the amount the crop needs for growth and production

Maintain proper soil pH

Use Best Management Practices to reduce erosion and runoff

All of the Above

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A bag of fertilizer at the store reads “50-25-50” what does this mean?

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50%. Nitrogen, 25% Phosphate, 50% Potash

50% Phosphate, 25% Nitrogen, 50% Potash

50% Potash, 25% Nitrogen, 50% Phosphate

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List the 3 soil particles in order from smallest to largest size.

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silt, sand, clay

sand, silt, rock fragments

clay, silt, sand

sand, silt, clay

Clear selection

What is the Virginia State Soil?

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Jamestown Soil

Virginiaois Soil

Pamunkey Soil

Cecil Soil

Clear selection

Weight per volume is a soil’s_____

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sand size

available water

bulk density

clay content

Clear selection

True or False:
Clay soil drains faster than sandy soil.

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True

False

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Select the soil properties that can affect the permeability of soil:

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Texture

Color

Structure

Pore Size and quantity

Animal and inset burrows

Which of the following are soil forming factors?

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Relief

Losses

Organisms

Time

Which pH range allows for the greatest availability of nutrients for plants?

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6.5-7.5

4.5-5.5

8.5-9.0

9.0-9.5

Clear selection

Soil color is greatly influenced by the oxidation of which of the following?

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Iron

Calcium

Copper

Clay

Clear selection

Match the options below:

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Nitrates

Assimilation

Ammonium

Fixation is a process in the nitrogen cycle where bacteria turn nitrogen into ___

After fixation, bacteria uses nitrification to turn ammonium into __________ which is usable by plants.

Once nitrogen has been fixed, plants can absorb it through their roots from the soil in a process known as ________ .

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