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Week 7 - Module 2 (Lec 18) (Difference between P and N Cycle (No gaseous…
Week 7 - Module 2 (Lec 18)
Phosphorous
Use as Fertiliser
Important nutrient or plant growth
Essential nutrient
Fruiting, photosynthesis, root development
Daily in detergent
Phosphorous cycle - Summary
P cycle
NO gaseous phase
no biological pathways to bring new P
Major source of new P is weathering of primary minerals
Erosion is a major output
Older soils contain less P
Anthropogenic effect = eutrophication
Fertilisation
Human/animal waste
detergents
mitigation depends on land-use
Difference between P and N Cycle
No gaseous phase in P cycle
No biological pathways to bring new P
Surface runoff
Major source of new P is weathering of Primary minerals
Phosphate limitation
Young soil is not limited
Old soil it is limited
Aus = low P levels
Yeild levels
Economic max yield around 90%
More P in soil (to a point) the more % yield will occur
After a point applying fertiliser after the max yield will prove inefficient
World P use is increasing
No phosphorous, no food = not enough P, compared with too much P
Environmental impact of P
Eutrophication = high conc. of P induce large biomass oa lagae
Eutrophic = high organic matter, oligotrophic = natural
Units
Quality = conc. = g/L
Quantity = conc. X vol. = g/L x L = g
Need volume