Q2_LESSON 2_ SOIL RESOURCES Flashcards

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1
Q

Important in sustaining man’s existence, and provides humans with the following services
1. Arable land for agriculture
2. Regulating water and filtering potential pollutants
3. Nutrient cycling
4. Foundation and support
5. Mineral Deposits

Upper- most (relatively thin) layers of the Earth’s crust.

A

Soil

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2
Q
  • the soil mantle of the Earth
  • Foundation of terrestrial life
A

Pedosphere

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3
Q

Components of soil
(NPK)

A

Nitrogen
Phosphorous
Potassium

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4
Q

Components of soil
(percentages)

A

45% Mineral
25% Air
25% Water
5% Organic Matter

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5
Q
  • Soil forms when rocks weathers
  • May be slow or rapid
A

Soil formation

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6
Q

Factors of soil formation

A
  1. Parent material: Source/ Origin
  2. Climate: Long term of weather
  3. Topography: Physical feature of an area
  4. Biological factor: Animals and microorganisms
  5. Time: Long and continous process
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7
Q

Relative size of soil particles

A

Soil texture triangle

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8
Q

Soil triangle

  • Big
  • 0.05mm - 2.00 mm
A

Sand

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9
Q

Soil triangle

  • Middle
  • 0.002 mm - 0.05 mm
A

Silt

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10
Q

Soil triangle

  • Smallest
  • Less than 0.002 mm
A

Clay

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11
Q

Soil profile

  • Mostly organic matter and humus
A

O Horizon (Surface litter)

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12
Q

Soil profile

  • Dark
  • High concentration of organic matter
A

A Horizon (Topsoil)

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13
Q

Soil profile

  • Lighter
  • Suspended materials move downward
A

E Horizon (Zone of leaching)

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14
Q

Soil profile

  • Light- colored (Yellowish)
  • Denser and less fertile than Horizon E
A

B Horizon (Subsoil)

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15
Q

Soil profile

  • Below the roots
A

C Horizon (Weathered parent material)

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16
Q

Soil profile

  • Lowest horizon
A

R Horizon (Bedrock/ Parent material)