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unit 5
Nutrient cycles
Phosphorus cycle
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Phosphate ions are present in rock
Long term weathering causes these Phosphate ions to slowly enter soils and waters around the globe.
Phosphate ions taken up (absorbed) by primary producers on land from the soil (and dissolved in water for aquatic primary producers).
2. Feeding takes place and the
phosphorus
in the
biological
molecules of the
primary producers
is transferred through to the consumers.
3. Waste products from the consumers or death of producers/consumers means that organic material is available for the
decomposers
(
Saprotrophs
)
They break down the
phosphorus
-containing molecules (
DNA
,
RNA
,
ATP
etc) and the
phosphate
ions become available to the
primary producers
again.
mycorrhizae
Gives a greater surface area for the plant to absorb nitrates and
phosphates
- the uptake is enhanced
Mycorrhizae receives sugars from plant
Plants associated with mycorrhizae will have an increased yield
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