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A sticky, putty-like feed indicates a high % of which soil separate
Clay
For which substance would the particle density equal the bulk density
quartz
Soil colours are scientifically described by____ colour designations such as 10YR3/4
Munsell
Brown and red colours in subsurface horizons are caused by ___ in the soil
iron oxides
Due to greater surface area per unit of soil mass, silt loam generally have a greater capacity than loamy sand to __
Absorb water, absorb gas, Release nutrients by weathering
Which soil has more pore space: clay vs sand
Clay - micropores + macropores (clay aggregates)
Soil organic matter consist of
organisms, dead tissues, polymerized and non-minerals
What is material deposited in lakes called
Lacustrine
Which of the following is not a characteristic of soil colloids
low water holding capacity
A well-drained soil under a rain forest in brazil contains significant amounts of a clay, which is likely
Kaolinite
Which of the silicate clays would likely have the highest of potassium in the crystal structure
Fine Grained Mica
Drainage of wetlands can result in extreme soil acidity. Which process, is occurring when the soil is drained
Oxidation of sulfur-bearing minerals that produces sulfuric acid
Phosphorous availability in acid soils is constrained by the presence of significant quantities of reactive___
Iron
The very high pH levels found in some arid region soils are most likely due to high levels of exchangeable
Na+
In various parts of the world, soil phosphorous is associated with which of the following health/environmental problems
eutrophication of lakes because of a build-up of soil P in the water sheds
In most soils, mineralization of SOM is an important source of plant available
both P + K
You would be most likely to find P deficient plant in which location
Sub-Saharan Africa
In what range of soil pH is phosphorous generally most available to plants
6-7
The total phosphorous lost from various watersheds is most closely correlated with high soil erosion (T/F)
true
The principal form of sulfur taken up by plants is by sulphate ion (T/F)
true
Oxidation of sulfides to sulphuric acid in soils developed in marine marshes can become extremely acidic if drained (TF)
true
The water contents are different in these soils, but the water potential is the same (TF)
True (the width of the film around the soil particles) Water film thickness is the same, so water potential is the same
The great majority of nitrogen in soils can be found in the form of dissolved anions
false Nitrogen is in an organic form, only a small amount is available as dissolved ions
Denitrification is NO3- (nitrate) becomes N2(gas) and goes into the atmosphere TF
true