Soils with thick horizons consisting mainly (> 30 by weight) of organic matter and that form in ...

Soils with thick horizons consisting mainly (> 30 by weight) of organic matter and that form in topographic depressions or low-lying places usually belong to the order ________.

A) Alfisols B) Spodosols C) Histosols D) Vertisols E) Umbrasols

Question 2

The buildup of excess salts in irrigated soils can result in increased pH if the salts are high in sodium bicarbonate.

Indicate whether the statement is true or false

Question 3

One would expect well drained soils to have the highest organic matter contents where the climate is ________.

A) cool and dry B) warm and humid C) cool and humid D) warm and dry

Question 4

Non-humic substances consist of ________.

A) dead tissues and wastes
B) polymerized, non-identifiable molecules
C) identifiable biomolecules
D) living organisms and cells
E) all of the above

Question 5

Mucigel is thought to improve the contact between plant roots and soil particles, thus enhancing the plant uptake of water and nutrients.

Indicate whether the statement is true or false

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Soils with thick horizons consisting mainly (> 30 by weight) of organic matter and that form in ...

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