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Soil Science exam 3 Ankumah
Terms in this set (66)
Not a major factor in determining the soil aeration status
Specific heat of a dry soil is
about 1/5 as that for water
Soil CO2 increases when
organic matter additions increases
the soil moisture regime of an aquol is
the mechanism of gas exchange in soils that prevents oxygen deficiency and carbon dioxide toxicity is
not well suited for well aerated soils
a soil which has an aridic moisture regime and an ochric or anthropic epipedon may most probably be classified as an
percentage of radiant energy used for photosynthesis
the major basis of classification of soil is
properties of horizons present
the subgroup name of miami series typic hapludalf
Plant roots require a supply of oxygen in the soil air to carry out
Ustochrept is a soil ____________name.
the exchange of gases by diffusion between the atmosphere and the soil air is due to differences in
partial pressure of individual gases in soil air and atmosphere
the order for a soil with alluvial parent material classified as an udent will be an
____ bacteria will be the dominant bacteria in soils with the temperature between 0 and 5 cells
soils that have a base saturation of less than 35%
soil temperature is important because it helps
Seed germination and microbial metabolism
a soil with a 6 degree difference between summer and winter temperature and a MAST
Soils that have argillic or kandic horizons and base saturation of greater than 35% will be classified as
The soils of the order vertisols are distinguished from other orders by
swelling of clay content
Adding salt to a soil solution increases its
A Bt horizon will be probably closest to the _________ subsurface horizon
Water in saturated soils is under
Soil Taxonomy has 6 categories, the most specific of the categories is
a subsurface horizon which has an acculmation of Fe and Al oxides and organic matter will be called a
the major component of the total soil water potential in unsaturated soil is the
gravitational water is held in macropores
An epipedon that thick, dark colored, high in bases, has a strong structure will be classified as:
An epipedon that has light color, low in organic matter content, and hard and massive when dry will most probably be a________ epipedon.
the soil ability to hold water is _____proportional to the size of its pores
The major component of the total soil water potential in unsaturated soil is the _____ potential.
Much oxygen from the soil air is used in
The surface attraction of water molecules for each other is termed
The forces active in causing capillary rise of water are:
Adhesion and cohesion
At the hygroscopic coefficient most of the micropores are filled with water
Under actual field conditions soil moisture content determines more than any other factor the energy
required to raise the temperature of soils
when water is attracted either by soil or ions and solutes, the free energy is increased
the following are lab methods used for determining soil water
pressure plates, Gravimetric methods and pressure membranes
the major component of soil water in wetland soils is the
have an asymmetrical charge distribution
under poorly-drained soils_____ will constitute the major microbial population
the process by which individual gases move in response to differences in pressure of the gas
A well aerated soil is characterized by a relative abundance of ________.
Fe 3t. NO3-. SO4 2-
of the soil properties listed , the one having the greatest effect on soil aeration is
the concentration of CO2 in the soil atmosphere is ____ than CO2 concentration in air
percent available plant water is
percent capillary water in the soil
percent moisture at -30 Kpa
the % moisture by weight (pw) at -3100 KPa is
the % moisture content by weight (pw) at -1500 Kpa
The % moisture by volume (pw) at field capacity
subsoil horizons containing an accumulation of humus, iron and aluminum are called _____ horizons.
soil stored plant available water is
pater of the water in micropores
the attraction of water molecules to soil is referred to ad
in unsaturated soil the soil moisture potential will most likely be
A subsurface horizon which has an accumulation of Fe and Al oxides and organic matter will be a called a/an ___________ horizon.
The polarity of water accounts for the attraction of water molecules for each other.
The major component of the soil water potential responsible for tensions observed in saturated soils is:
The useful range of tension plate in soil moisture measurement is
0.0- 50 kPa
The algebraic sign of the matrix potential of water held in the soil by capillary forces of attraction is
Seed germination stops between _______
0 and 5oC
Under well-drained soils __________ will constitute the major microbial population.
In which of the following soil situations would you expect to find the highest soil temperature if each soil situation was given similar amounts of solar energy?
A sandy soil at wilting point with high organic matter content
Soil air usually contains less________ than atmospheric air.
o2 (molecular oxygen)
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