The Nitrogen Cycle

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The carbon cycle

• Trace the pathways through which carbon is
  released and absorbed in the diagram below

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The nitrogen cycle

• Nitrogen is important to living things because it
  is used to make amino acids, the building blocks
  of all proteins.
• Approximately 78 percent of Earths atmosphere is
  nitrogen gas (N2).

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The phosphorus cycle

• Phosphorus is essential for cell replication,
  metabolism, and structures.
• Phosphorus from minerals is absorbed by the roots
  for use by the plant.
• Animals obtain phosphorus by eating plants.

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The Potassium Cycle
Component
Input to soil
Loss from soil
Animal manures and biosolids
Crop harvest
Plant residues
Mineral fertilizers
Runoff and erosion
Exchangeable potassium
Plant uptake
Soil solution potassium (K)
Fixed potassium
Mineral potassium
Leaching
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The Sulfur Cycle
Component
Input to soil
Loss from soil
Atmospheric sulfur
Volatilization
Atmospheric deposition
Crop harvest
SO2 gas
Mineral fertilizers
Plant residues
Animal manures and biosolids
Elemental sulfur
Runoff and erosion
Absorbed or mineral sulfur
Plant uptake
Oxidation
Organic sulfur
Reduced sulfur
Bacterial oxidation
Immobilization
Sulfate Sulfur (SO4)
Bacterial reduction
Mineralization
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Leaching
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