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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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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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