Nutrient cycles

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Karnav Rana

Nutrient cycles The Nitrogen Cycle The Phosphorus Cycle The Potassium Cycle The Sulfur Cycle

Engineering

The Nitrogen Cycle
Atmospheric
nitrogen
Atmospheric
fixation
and deposition
Animal
manures
and biosolids
Industrial fixation
(commercial fertilizers)
Crop
harvest
Volatilization
Denitrification
Runoff and
erosion
Leaching
Organic
nitrogen
Ammonium
(NH4)
Nitrate
(NO3)
Plant
residues
Biological
fixation by
legume plants Plant
uptake
Input to soilComponent Loss from soil
-
+

The Phosphorus Cycle
Animal
manures
and biosolids Mineral
fertilizers
Crop
harvest
Runoff and
erosion
Leaching
(usually minor)
Organic phosphorus
•Microbial
•Plant residue
•Humus
Primary
minerals
(apatite)
Plant
residues
Plant
uptake
Soil solution
phosphorus
•HPO4
-2
•H2PO4
-1
Secondary
compounds
(CaP, FeP, MnP, AlP)
Mineral
surfaces
(clays, Fe and
Al oxides,
carbonates)
Input to soilComponent Loss from soil
Atmospheric
deposition

The Potassium Cycle
Animal
manures
and biosolids
Mineral
fertilizers
Crop
harvest
Runoff and
erosion
Leaching
Soil solution
potassium (K+)
Plant
residues
Plant
uptake
Mineral
potassium
Fixed
potassium
Exchangeable
potassium
Input to soilComponent Loss from soil

The Sulfur Cycle
Animal
manures
and biosolids
Mineral
fertilizers
Crop
harvest
Runoff and
erosion
Leaching
Absorbed or
mineral sulfur
Plant
residues
Plant
uptake
Sulfate
Sulfur
(SO4)
Atmospheric
sulfur
Elemental
sulfur
Organic
sulfur
Reduced sulfur
Input to soilComponent Loss from soil
Volatilization
Atmospheric
deposition
-

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