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eutrophication

Natural & Artificial. Environmental impact-leaching & eutrophication

TermDefinition
why are fertilisers added to soil This is to replace the nitrate and phosphate ions lost when plants are harvested and removed from the nutrient cycles as crops 2 fertilisers are natural and artificial
What are natural fertilisers advantages and disadvantages natural fertilisers are cheaper and often free if the farmer own animals however the exact minerals and proportions cannot be controlled
What are artificial fertilisers advantages and disadvantages They created to contain exact proportions of minerals Inorganic substances are more water soluble so these ions dissolve in the water surrounding the soil. However this causes larger quantities to be washed by rainfall affecting environment
What is an environmental impact Leaching is when water soluble compounds are washed away often into rivers or ponds If nitrogen fertilisers leach into waterways this causes eutrophication
What is eutrophication This is when nitrates leached from fertilised fields stimulate growth of algae in pond.
What happens due to the growth of the algae This creates a blanket on the surface of water which blocks out light . This then causes plants below to die due to them being unable to photosynthesise.
What do bacteria do to the dead plant matter Bacteria then feed and respire on the dead plant matter
What does this then cause the bacteria to do This results in a increase in bacteria which are all respiring and using up the oxygen within the water
What happens to fish and other aquatic organisms This then causes fish and other aquatic organisms to die due to lack of dissolved oxygen in the water.
Created by: yHya
 

 



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