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Q1.
The different layers in soils are termed soil profiles and collectively
known as the soil horizon.
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Q2. The
Munsell Soil Colour Chart System is based on colour identified by two
properties: hue and chroma.
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Q3. Red
mottling is evidence of a fluctuating water table.
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Q4.
Clay soils have large pores and thus have
good drainage and aeration properties.
Q5.
Mineral soil is classified as having less that
10 per cent organic matter.
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Q6.
Trace elements are elements that are only
present in small amounts in the soil under focus.
Q7.
The field capacity relates to the amount
of water retained by soil after drainage by gravity has ceased.
Q8.
The category of the anthrosol was developed
by the FAO-UNESCO Soil Map of the World to describe soil extensively worked
by ants.
Q9
The best soil for food production is one
with very high levels of all nutrients.
Q10.
The great dust bowl of the American Midwest
was caused by the continuance of agricultural practices in during wet
years being carried on in drought conditions.
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Q11.
One technique of preventing soil erosion is to keeping the stubble and
root structure of the crop in the soil after harvesting.
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Q12. The
increasing use of brown field sites for residential and industrial use
means that the remediation of contaminated soils is becoming very important.
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Q13. Phytoremediation
is a method of biological remediation of contaminated land using plants.
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Q14. The
unequal distribution of food supply across the world is linked to the
variation in soil quality and productivity but also to international trade
and political factors.
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Q15. Soils
have an important role in climate change, due to their crucial setting
in carbon and nitrogen cycles.
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© copyright Hodder Arnold 2004
