Chapter 6

Question 1

are soils that are not suitable or fit for crop production.

Answer 1

Problem soils

Question 2

are one of the most important soil
fertility problems in the tropics

Answer 2

Acid soils

Question 3

-removal
of
H+
ions
from
functional
group
of
organic matter.

Answer 3

Deprotonation

Question 4

produced from soil organic matter
decomposition

Answer 4

Organic acids

Question 5

Types of salt-affected soil

Answer 5

Saline soil
Sodic soil
Saline-sodic soil

Question 6

Types of problem soil

Answer 6

Acid soil
Calcareous soil
Salt-affected soil

Question 7

portion of H+ and Al3+
ions
that are adsorbed by soil colloids (e.g., clay and
organic matter) that can be replaced by salt
solution such as KCl or NaCl.

Answer 7

Exchangeable acidity-

Question 8

• refers to bound H+ and Al3+
  ions
  that cannot be replaced by salt solution.

Answer 8

Residual acidity

Question 9

• sulfur oxidation in acid sulfate
  soil

Answer 9

Potential acidity

Question 10

is caused by a natural process such as
weathering of minerals or by human-influenced activities like fertilizer
application.

Answer 10

Soil acidity

Question 11

is caused by a natural process such as
weathering of minerals or by human-influenced activities like fertilizer
application.

Answer 11

Soil acidity

Question 12

are formed by weathering of calcareous rocks, marl, and limestone.
Management of calcareous soils includes the application of acidforming fertilizers and manures.

Answer 12

Calcareous soils

Question 13

are soils with
an excessive amount of soluble salts.

Answer 13

salt-affected soils