Soil Around the World Answers

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How is over-irrigation damaging to soil?

It reduces the amount of organic material in soil.

It results in the accumulation of salt near the soil surface.

It increases the acidity of soil.

It removes water from the water table.

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Utilizing ultisols for agriculture requires _______.

extensive irrigation

fertilizer to balance the high alkalinity of the soil

adding organic matter to supplement the shallow horizons

fertilizer to replace nutrients that leach from the soil

Why might soils rich in organic matter not be fertile?

Soil fertility comes from a balance of organic matter and other mineral nutrients.

Large amounts of organic material make soil retain too little water.

Soil fertility is a result of the inorganic minerals present.

Soils rich in organic material are always highly fertile.

Soil color only reflects the amount of organic matter present in soil.

Soil compaction results from _______.

the reduction or elimination of pore space in soil

the weight of heavy machinery on soil

livestock walking over soil

all of the above

Which of the following is not a defining characteristic of soil?

mineral composition

humidity

texture

color

Lower temperatures lead to slower soil formation.

Histosols experience a fast rate of decomposition. Please select the best answer from the choices provided

What kind of vegetation do fertile, well-developed alfisols support?

desert scrub

peat bogs and marshland

temperate forests

tropical rainforest

Aridisols are soils characteristically found in _______.

forests

plains

deserts

swamps

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