Title: Final Test
Course: HRT 114 Introduction To Soil Science > Section: HRT 114 Introduction To Soil Science

Q: Compared to the solid portion of soils, the amount of soil air or soil water does not change very much with time.
- True
- False
A: False

Q: Soils can store too much water as well as too little water for satisfactory plant growth.
- True
- False
A: True

Q: Organisms, such as plant roots, microbes, burrowing insects, and worms, inhabit the soil but do not exert any influence on the soil.
- True
- False
A: False

Q: The release of nitrogen may occur if the carbon compounds in organic matter are broken down by decay organisms in the soil.
- True
- False
A: True

Q: Cations in soils are those materials which have a positive charge (such as K) and tend to be washed out of soils much faster than negative charged materials (such as N).
- True
- False
A: False

Q: Decomposers take on a dominant role above the soil surface.
- True
- False
A: False

Q: Natural organics, like composted yard waste, are slow acting fertilizers.
- True
- False
A: True

Q: A 12 – 6 – 6 fertilizer grade would have a 2 – 2 – 1 fertilizer ratio.
- True
- False
A: False

Q: Different natural organic materials vary in their resistance to decay and in C/N ratio effects.
- True
- False
A: True

Q: Soil organisms usually require oxygen to decompose organic material.
- True
- False
A: True

Q: The original source of most organic matter in soils is:
- Plant residues
- The bodies of dead animals and insects
- Soil-inhabiting microorganisms
A: Plant residues

Q: Maximum daily variation in temperature at the soil surface occurs when:
- The soil surface is bare
- The soil surface is mulchedls and insects
- The soil is wet
A: The soil surface is bare

Q: The material with the highest cation exchange is
- Sand
- Organic matter
- Vermiculite
A: Organic matter

Q: The uptake of nutrients by plants from the soil is called:
- Mineralization
- Immobilization
- Sanitization
A: Immobilization

Q: The elements most often found in lime used to raise pH are:
- Calcium and magnesium
- Hydrogen and aluminum
- Potassium and sodium
A: Calcium and magnesium

Q: The release of available nutrients back to the soil is called:
- Immobilization
- Mineralization
- Evacuation
A: Mineralization

Q: This nutrient stimulates above ground growth:
- Phosphorus
- Nitrogen
A: Nitrogen

Q: Micronutrients are usually found in levels under:
- 500 ppms. In plants
- 50 ppms. In plants
- 5 ppms. In plants
A: 50 ppms. In plants

Q: A pH of 8 is ___________ times greater than a pH of 6.
- 2
- 20
- 100
A: 100

Q: An increase of ______________ ions will lower the pH of a soil.
- Calcium
- Magnesium
- Hydrogen
A: Hydrogen

Q: Describe the condition of chlorosis and how would one remedy it.

Q: What does the range of luxury mean for a plant?