Fertilizers and Pesticides

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Aims of the session:

Learn about fertilisers and their effects on the environment.

Be able to answer exam questions on the effects.

Learn about Pesticides and their effects

Summarise the key points about pesticides

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Fertilisers and Pesticides

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Fertilisers

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The process of Eutrophication

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The process of Eutrophication cont.

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Biochemical Oxygen Demand (BOD).

This measures the rate of oxygen consumption by a sample of water, and therefore gives a good indication of eutrophication. A high BOD means lots of organic material and aerobic microbes, i.e. eutrophication

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The nitrate concentration falls during spring and summer and rises during autumn and winter

Less algal growth as autumn begins

Possibly all plants have died

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Pesticides

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Pesticides

Include:

Herbicides

Insecticides

Fungicides

Bactericides

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Pesticides

Persistence

+ Lipid solubility

= Bioacculmulation

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Bioaccumulation

E.g DDT

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